Wyniki wyszukiwania - Biblioteka Nauki

1

Mikrobiologiczne zanieczyszczenie gleb uprawnych w okolicach Białegostoku

100%

Błachno B.

Zeszyty Naukowe Politechniki Białostockiej. Inżynieria Środowiska

|

2001

|

tom Z. 12

231-233

PL

W pracy przedstawiono wyniki analizy mikrobiologicznej próbek gleb uprawnych, pobranych w okolicach Białegostoku. Badania obejmowały oznaczenie ogólnej liczby bakterii psychro-, mezo- i termofilnych, liczby bakterii z rodzaju Salmonella, miana bakterii grupy coli typu ogólnego i fekalnego oraz miana paciorkowców kałowych i bakterii z rodzaju Clostridium. Otrzymane wyniki świadczą o mniejszym stopniu bakteriologicznego skażenia gleb w okolicach Białegostoku niż w Polsce centralnej (w okolicach Warszawy i Łodzi).

EN

The aim of this study was to evaluate the bacteriological pollution in the soil samples from the region of Białystok. Microbiological examination revealed that these soils were polluted in less degree than soils near Łódź and Warsaw.

2

Assessment of Occurrence, Ecological and Health Risk of Heavy Metals in Agricultural Soil in the Hau Giang Province, Vietnam

100%

Hong T. T. K. , Dan T. H. , Giao N. T.

Journal of Ecological Engineering

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2022

|

tom Vol. 23, nr 9

61--71

EN

The study aimed to evaluate the occurrence of some heavy metals in agricultural soil in the Hau Giang province, Vietnam. The geographical accumulation index (Igeo), pollutant load index (PLI) and ecological risk index (RI) are used to assess the pollution levels and potential ecological risks due to the presence of heavy metals in agricultural soil. The results showed that the mean concentrations of Cu, Pb and Zn in the soil ranged from 16.25–40.32, 18.05–29.92 and 52.78–147.22 mg/kg, respectively, within the limits of QCVN 03-MT:2015/BTNMT. Cluster analysis showed that Pb originated from the process of using fertilizers, especially phosphate fertilizers in farming. Cu and Zn possibly share a common origin from the use of pesticides and fungicides in agricultural production. The Igeo value of Cu, Pb and Zn gradually increases in the order of Cu < Zn < Pb. The PLI (1.03–1.97) reflected that the soil in the study area is moderately polluted. The RI (14.80–25.33) represented a low potential ecological risk. In particular, position D3 had the highest level of pollution and risk among the study sites. Pb had the highest level of accumulation in soil with the highest single ecological risk factor; thus, measures should be taken to limit the source of Pb generation. The results of the study also indicated that ingestion route is the main exposure pathway by which heavy metals can be harmful to humans.

3

Physico-Chemical Characterization and Quality of Agricultural Soils in the Zaër Region (Morocco)

88%

El Omari M. , Aziane N. , Zerdeb M. A. , Naoui B. , El Mekkaoui A. , Akhlidej N. , Oubbih J. , Chakiri S. , Amahmid O. , Zouahri A.

Ecological Engineering & Environmental Technology

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2023

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tom Vol. 24, iss. 8

155--171

EN

This qualitative study of the soils of the Zaër region is part of a context of good development, preservation and sustainability of agricultural soils. Its aim is to establish a reference framework for the physico-chemical characteristics of the region’s agricultural soils. It was based on a spring sampling campaign carried out in 2021. Composite samples taken from thirteen sites with diverse soils were analysed in the laboratory. The soil analysis results were compared with reference values. The soils examined were moderately acidic to moderately alkaline, with low levels of organic matter. Nevertheless, concentrations of exchangeable calcium and magnesium were found to be sufficient, while sodium levels were very low. Furthermore, cation exchange capacity was low in spring, reflecting the soil’s high and low nutrient retention capacity respectively. Phosphorus and potassium levels appear to be low. In the light of these results, the use of organic and mineral fertilisers and calcium amendments is strongly recommended to improve agricultural quality and productivity in the region studied.

4

Elemental Metals in Agricultural Soils Along Two Tributaries of Chaohu Lake: Implication on Soil Erosion Caused Enrichment in Sediments

88%

Xie F.-Z. , Zhang D.-D. , Wang J.-Z.

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tom Vol. 23, iss. 1

241-253

EN

Agricultural soil as a potential source of input of heavy metals into the lacustrine sediments of Chaohu Lake via soil erosion and weathering has not been well documented. In the present study, rice soil samples along two main tributaries of Chaohu Lake were collected to determine 30 metal elements which were compared with the data on the elements in surface sediments of Chaohu Lake to explore the impacts of soil erosion on the accumulation in the sediments. The results showed that the concentrations of most elements were less than their soil background values of Anhui Province, but Se, Sb, Sn, As, and Ba were greater than the corresponding background values. Furthermore, these elements except for Sc in the soils appeared a low variability in spatial distribution. Enrichment factor (EF) also suggested that most elements were minimally enriched, but Se, Th and As were found with moderate enrichment in the study areas. More than 90% of agricultural soils were not expected with significant contamination by the residual elements based upon the consideration of pollution level index (PLI) combining probabilistic density function. Compared with the residual elements in the surface sediments of Chaohu Lake, most elements (Ti, Mn, Zr, Sr, Zn, Ga, Hf, U, Se, Sn, Nb, Th, V, Cd) appeared depletion in agricultural soils but enrichment in sediments. Specially for Cd, it was not detectable in all soils samples, but it existed at an extreme average content in the lacustrine sediments. These results possibly implied that elements in agricultural soils in Chaohu Lake were depleted because of soil erosion and weathering during long-term agricultural practice, resulting in enrichment in sediments of the lake. The depletion of elements in soils was predominately due to the fact that these metals existed in the soil with a large mobile fraction. While As, Th and Se moderately accumulated in the soils due to their insusceptibility of transport potentials. Because Sr and U are easier to be leached from soils than Rb and Th, respectively, a greater ratio of Rb/Sr and a lower value of U/Th was found in soil samples than in sediments. Therefore, our study implied agricultural soils could play an important role in the input of heavy metals into sediments via soil erosion and weathering.

5

Heavy Metals in Soils from High Andean Zones and Potential Ecological Risk Assessment in Peru’s Central Andes

88%

Mendoza E. O. , Custodio M. , Ascensión J. , Bastos M. C.

|

2020

|

tom Vol. 21, nr 8

108--119

EN

Soil is exposed to heavy metals that are associated with the anthropogenic activities, and is currently an environmental and food safety problem. The concentration and source of heavy metals in soils, the level of contamination and the potential for ecological risk in high Andean ecosystems were evaluated. The soil samples were collected from the surface part in which Andean crops were sown and the concentration of As, Cd, Pb, Fe and Zn was quantified. The concentrations of heavy metals in soils did not exceed the threshold of the national and international standard, while As, Pb and Zn exceeded the values of the background. The contamination factor (CF) values showed a high level of contamination for As and moderate for Pb and Zn. The geoaccumulation index (Igeo) values showed that As had the highest load of accumulated pollutants in soils by anthropogenic contribution. A moderate degree of contamination (CD) was found in 61.5% of the sampling sites. The potential ecological risk index (RI) showed that the soils of the study area presented a moderate to low potential ecological risk, and As was the main pollutant in high Andean soils. As, Pb and Zn occurring in high Andean soils mainly originated from human activities such as agricultural practices, whereas Fe mainly originated from the parent material of the soil. The effects of the use of organic and inorganic fertilizers on the accumulation of heavy metals in and Andean agricultural products must be analyzed and verified to protect the health of the inhabitants and the environment.

6

Heavy Metals Effects on Agricultural Soil Enzyme Activities of Fez, Morocco

88%

Zerrari N. , Rais N. , El Ghachtouli N. , Kouchou A. , Ijjaali M.

Journal of Ecological Engineering

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2023

|

tom Vol. 24, nr 5

144--154

EN

Enzyme activities in soils are influenced by soil characteristics and pollutants and could be indicator of soil quality. This study was undertaken to determine the relationship between physicochemical characteristics, heavy metals contents and enzyme activities (EA) in agricultural soils in the Saiss plain (Morocco). The analysis of six agricultural soil samples (sites 1–6), collected from urban and periurban agricultural soils of Fez region, showed that soils are generally alkaline with high CaCO3 that rich 46%, EC (525–703 μS/cm), rich in organic matter (3.14–5.80%). The Cr, Cu, Ni, Pb and Zn concentrations in the studied area are generally greater than the Upper Continental Crust, with a deceasing order: Zn> Cr> Pb> Cu> Ni. Geo-accumulation index showed that soils are unpolluted to moderately polluted except site 5 and site 6 that are moderately to strongly polluted by respectively Cu, Pb, Zn and Pb. Potential ecological rіsk factors were below 40, which means low potential ecological rіsk except site 5 that has moderate potential ecological risk by Cu and Pb. Soil potential ecological risk indices were found <150 indicating low ecological risk. According to this index, Cu caused more serious pollution than the other elements. The enzyme actіvities of the sіx soil samples showed almost the similar ranges of values. These EA showed the highest values in site 5.The sensіtivity of soil enzyme to heavy metals were observed UREA>PHOS>GALA. Pearson’s correlation showed significant posіtive correlatіon between studied soil EA and between these EA and heavy metals (Cu, Pb and Zn), and significant negative correlatіon between EA and heavy metals (Cr and Ni). The results of this study enrich and provide data base of the impact of heavy metals on soil enzyme actіvities in agrіcultural soils in the Saiss plain.

7

The Effect of Purified Wastewater on the Physicochemical Properties of Agricultural Soils in Chaouia in Morocco

88%

Abou-Tammame D. , Zouhri A. , Boutarfa A. , Fathi J. , Aboutayeb R.

Journal of Ecological Engineering

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2022

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tom Vol. 23, nr 1

34--42

EN

The aim of this study was to assess the impact of the reuse of purified wastewater from the wastewater treatment plant in the city of Settat on the physicochemical quality of agricultural soils compared to the agricultural soils irrigated by rainwater in the region of Chaouia in Morocco. The results obtained showed that despite the great fertilizing value of the purified wastewater, a slight increase in salinity was noted; they also reveal a significant difference in pH. The accumulation of sodium, total limestone and active limestone in the soil increased significantly in the soils irrigated by treated wastewater; in contrast, calcium increased significantly in the soils irrigated by rainwater.No significant differences were recorded for humidity, electrical conductivity, ammonium, nitrates, phosphorus, potassium, organic matter, total nitrogen or cation exchange capacity.

8

Evaluation of chelating agents as heavy metals extractants in agricultural soils under threat of contamination

88%

Kocialkowski W. Z. , Diatta J. B. , Grzebisz W.

Polish Journal of Environmental Studies

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1999

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tom 08

|

nr 3

9

Selected monitoring properties of agricultural soil from the Imielin experimental site

75%

Radziemska M. , Fronczyk J. , Lech M. , Sieczka A. , Lechowicz Z.

Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

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2016

|

tom 25

|

nr 2[72]

EN

Selected monitoring properties of agricultural soil from the Imielin experimental site. The effects of two types of agricultural practice: variable rate application (VRA) and uniform (UNI) N dose on selected chemical properties of soil were compared in a fi eld fertilization experiment. Nitrogen, in doses 60 or 80 kg·haˉ¹ (UNI) and 55–105 kg·haˉ¹ (VRA), was applied to soil farmed with winter wheat (Triticum aestivum L.). The research was conducted in the 2012/2013 growing season in Poland on 22 ha of production fi elds located in the Imielin countryside (central Poland). The soil samples were taken from three depths: 0.0–0.3, 0.3–0.6, and 0.6–0.9 m, and the pH, HAC, TEB, CEC, and BS were determined. The application of the nitrogen fertilizer in the two types of agricultural practice – variable rate application (VRA) and uniform (UNI) N dose modified the basic physical and chemical properties of soil. The highest values of pH and hydrolytic acidity were observed at the soil depth of 0.6–0.9 m after the first rate of nitrogen fertilizer was applied. Cation exchange capacity of soils collected after uniform nitrogen rates were characterized by values decreasing with the increasing depth of the soil profile.

PL

Wybrane parametry monitoringowe gleb rolnych obiektu doświadczalnego Imielin. Wpływ dwóch rodzajów nawożenia: zmienną (VRA) i stałą dawką azotu (UNI) na wybrane właściwości chemiczne gleb została określona na podstawie doświadczeń polowych. Dawki azotu w ilościach 60 i 80 kg·haˉ¹ (UNI) oraz 55–105 kg·haˉ¹ (VRA) były dodawane do gleby, na której uprawiano pszenicę ozimą (Triticum aestivum L.). Badania przeprowadzono w sezonie wegetacyjnym 2012/2013 na 22 ha polu uprawnym zlokalizowanym w miejscowości Imielin (centralna Polska). Próbki gleb pobrano z trzech głębokości: 0,0–0,3, 0,3–0,6 i 0,6–0,9 m, i oznaczono w nich: pH, EC, Hh, S, T, V. Aplikacja nawozów azotowych w zmiennej (VRA) i stałej dawce (UNI) azotu modyfikowała podstawowe fizyko-chemiczne właściwości gleby. Największymi wartościami pH i kwasowości hydrolitycznej charakteryzowała się gleba pochodząca z głębokości pomiarowej 0,6–0,9 m, pobrana po pierwszej dawce wysiewu nawozów. Kationowa pojemność gleb pochodzących z poboru po drugiej dawce nawożenia stałą dawką azotu charakteryzowała się wzrostem swej wartości w miarę zwiększania się głębokości pomiarowej.

10

Risk assessment of irrigation with water contaminated by trace metals on the soil-plant complex in the El Madher plain, north-east Algeria

75%

Benfarhi F. , Menani M. R.

Journal of Water and Land Development

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2022

|

tom no. 54

59--67

EN

Polluted water poses significant health risks when it is part of the water sources used for irrigation, leading to the contamination of soil and plants by various pollutants. This work aims, firstly, to assess the degree of pollution of Wadi El Gourzi water (Batna, Algeria), and then to verify the consequences on their use for the irrigation of market garden plants for everyday consumption (lettuce, cilantro, parsley and spinach), both in the aerial part (stems and leaves) and in the soil where they are grown. This study focuses on trace metals (Cr, Pb, Zn and Cd). Soil pollution was assessed by calculating the soil pollution index (PI), while the uptake of these elements by plants was monitored by the transfer factor (TF). The analyses of the Wadi El Gourzi water with the flame atomic absorption spectrophotometer (FAAS) show a maximum abnormal concentration of Cr (17.37 mg∙dm-3), Pb (0.71 mg∙dm-3) and Cd (0.45 mg∙dm-3). For the analysis of the soils irrigated by these waters, the results of the PI show that the soils used for the cultivation of parsley and lettuce are polluted by several metals (PI > 1). The concentrations of trace metals elements (TMEs) in the sampled plants show a significant accumulation of Zn, Cd, Pb and Cr by the vegetables (coriander, parsley, spinach and lettuce). These concentrations are above the permitted standards.

11

Modeling and analysis of efficient electromagnetic parameters of capillary system of electrical conductivity of agricultural soils I: method of analysis of non-stationary electromagnetic fields in dispersive and controlled environments

75%

Brovarets A. , Chovniuk Y.

|

nr 4

12

Soil organic matter status in agricultural soil sequence of former shoreline of disappearing Sumowskie Lakes, North-Eastern Poland

75%

Markiewicz M. , Mendyk L. , Gonet S. S.

Polish Journal of Soil Science

|

2015

|

tom 48

|

nr 1

EN

The aim of the study has been to define the stocks and the basic properties of soil organic matter in agricultural-used soil sequence located in the former shoreline of disappearing lakes. The study area is located in the catchment of the Sumowskie Lakes, the Brodnica Lake District, North-Eastern Poland. The investigations involved preparation of five soil pits located in the south-western part of the former Sumowskie Lake bottom and on the southern slope of the adjacent kame hill. The greatest soil transformation is reflected in the quality and quantity of the soil organic matter. Indexes of organic matter quality and TOC stocks are significantly changing along the studied transect. The strongly humidified organic matter is found in mursh horizons. Gyttja layers above the groundwater level have a medium humification index. Horizons saturated with water are very low humidified. TOC stocks drop along the analysed soil sequence from the biogenic plain to the top of the kame hill.

PL

Celem badań było określenie zasobów i podstawowych właściwości materii organicznej sekwencji rolniczo użytkowanych gleb dawnej strefy brzegowej zanikających jezior. Obszar badań był zlokalizowany w zlewni jezior Sumowskich na Pojezierzu Brodnickim w Polsce północno-wschodniej. Analizowano transekt składający się z pięciu profili glebowych znajdujących się w pd.-zach. części dawnego Jeziora Sumowskiego. Obejmował on dno dawnego jeziora oraz przylegające wzgórze kemowe. Największe zróżnicowanie gleb dotyczyło ilości i jakości glebowej materii organicznej. Zarówno właściwości materii organicznej, jak i jej zasoby wyraźnie różnicują się w analizowanym transekcie. Materia organiczna poziomów murszowych gleb pojeziornych odznacza się najwyższym stopniem humifikacji, warstwy gytii, powyżej poziomu wód gruntowych, pośrednim, a poziomy nasycone wodą najniższym spośród analizowanych. Zasoby węgla organicznego zmniejszają się wzdłuż transektu od gleb pojeziornych do szczytu pagórka kemowego (pararędziny).

13

Heavy metals in agricultural soils in Poland

75%

Terelak H. , Stuczynski T. , Piotrowska M.

|

1997

|

tom 30

|

nr 2

14

Effect of a land reclamation system on the volume and seasonality of nitrate runoff from croplands

75%

Koc J. , Solarski K. , Rochwerger A.

|

tom 12

|

nr 2

EN

The paper contains the results of eight-year-long studies on the runoff of nitrates from heavy soils used as croplands. The runoffs of nitrates from a drainage catchment and a catchment drained with ditches were compared. The drainage system was found to carry away twice as much water, with a five-fold higher concentration of nitrates and 20-fold higher load of nitrates, than the system of ditches. High runoff of nitrates (22 kg ha-1 annually) from the soils drained by drains was distributed quite evenly throughout the year, with maximum peaks in March and June. Nitrate runoff through the system of ditches was low (1.15 kg ha-1 annually), reaching maximum peaks in March and April (62% of the load), but disappearing in the summer.

PL

W pracy przedstawiono wyniki 8-letnich badań odpływu azotanów z gleb ciężkich użytkowanych ornie. Porównywano odpływ azotanów ze zlewni drenarskiej i zlewni odwadnianej rowami. Stwierdzono, że system drenarski odprowadza 2-krotnie więcej wody o 5-krotnie wyższym stężeniu azotanów i 20-krotnie wyższym ich ładunku niż system rowów. Z gleb odwadnianych drenami wysoki odpływ azotanów (22 kg rocznie z 1 ha) rozkładał się równomiernie w ciągu roku, z maksimum w marcu i czerwcu. Odpływ azotanów systemem rowów był niewielki (1,15 kg rocznie z 1 ha), z maksimum w marcu i kwietniu (62% ładunku) i zanikiem odpływu latem.

15

The effect of long-term mineral fertilization on the mycoflora and chitinolytic activity of agricultural soils

75%

Popowska-Nowak E. , Koval E. Z. , Kharkevich E. S.

Polish Ecological Studies

|

1995

|

tom 21

|

nr 1

16

The impact of additional Pb input on the dynamics of Pb-enriched agricultural soils

75%

Diatta J. B.

Polish Journal of Environmental Studies

|

2006

|

tom 15

|

nr 2

EN

Agricultural ecosystems are differently sensitive to heavy metal inputs, which at present are directly related to human activities. Lead is of particular concern due to its ability to threaten soil quality and human health. The investigated soil samples were collected from different agricultural soils (under cereal croppings) moderately subjected to activity of the Głogów Copper Smelter (Poland). They consisted of an acidic soil (Dystri-Gleyic Fluvisols - S₁) and three near neutral to slightly alkaline soils (Haplic Luvisols - S₂, Gleyic Fluvisols - S₃ and Molli-Gleyic Fluvisols - S₄). These soils were tested in order to determine the impact of additional Pb inputs on its dynamics and mobility. Of all the soils studied, S₂, S₃ and S4 have exhibited higher acid buffer capacities than S₁. Lead sorption parameters, such as Langmuir adsorption maximum (amax) and parameters related to interaction energies (b) as well as the Freundlich partition parameter (KF), were used for comparing the reactivity and dynamics of added Pb into these soils. The data showed that S₂, S₃ and S₄ retained more Pb than did S₁, characterized by low specific surface area (SSA) and cation exchange capacity (CEC). Charge-based (SDCEC) and specific surface-based (SDSSA) sorption densities were also used for evaluating the direct impact of additional Pb inputs. These parameters revealed that S₂, S₃ and S₄ may support greater inputs of Pb with less threat to its mobility, in contrast to S₁. Therefore, any practices leading to additional Pb inputs into the latter soil may result in serious Pb mobility. The negative values of the Gibbs free energy changes (ΔGo) for Pb dynamics in the studied soils confirm that the ion exchange process proceeded naturally and spontaneously with a markedly high affinity for Pb ions developed by S₂, S₃ and S₄, and low affinity by S₁.

17

Evaluation of potassium quantity-intensity parameters of selected Polish agricultural soils

63%

Diatta J. B. , Kocialkowski W. , Grzebisz W.

Electronic Journal of Polish Agricultural Universities. Series Agronomy

|

2006

|

tom 09

|

nr 4

18

The evaluation and determination of heavy metals pollution in edible vegetables, water and soil in the south of Tehran province by GIS

63%

Shirkhanloo H. , Mirzahosseini S. A. H. , Shirkhanloo N. , Moussavi-Najarkola S. A. , Farahani H.

Archives of Environmental Protection

|

2015

|

tom Vol. 41, no. 2

64--74

EN

In this study, heavy metals pollutions in waters, soils and vegetables were investigated from farms, near oil refinery in south of Tehran city, Iran (Shahre Ray). The most important heavy metals in Iranian oil are vanadium, cobalt, nickel, arsenic and mercury (V, Co, Ni, As, Hg). In this region, the concentration of heavy metals in soils, well waters and leafy edible vegetables were evaluated in ten different points of farms. Geographic information systems (GIS) were used to estimate the levels of heavy metals concentration at unmeasured locations. After sample preparation, concentrations of heavy metals in vegetables, soils and waters were determined by atomic absorption spectrometry (AAS). Five different leafy edible vegetables from farms, i.e., Persian leek, dill, parsley, spinach and radish were sampled in spring, summer and autumn 2012. In vegetables and well water samples, the concentrations of V, Ni and Co were above the permissible limit of heavy metals as compared to WHO guidelines and the concentrations of these metals in agricultural soils were found to be lower in accordance to soil references. The industrial waste waters had high concentration of heavy metals in this area. In consequence, the results of this study indicate that industrial waste water can cause pollution in well waters and edible vegetables. So, this region is not suitable for cultivation and growing vegetables.

19

The long-term impact of ameliorating doses of hard coal fly ash on shaping the content of selected microelements in agricultural soil

63%

Ciecko Z. , Zolnowski A. C. , Madej M. , Wasiak G. , Lisowski J. , Rolka E.

Polish Journal of Soil Science

|

2015

|

tom 48

|

nr 1

EN

The effect of ameliorating doses of hard coal fly ash (HCFA) on chemical properties of soil and on yields and chemical composition of crops was examined based on an experiment established in 1984. At first, typical agricultural crops were grown in the experiment, but in 1992 the field was turned into permanent grassland. The current study took place twenty-nine years after hard coal fly ash had been applied. Soil samples were collected from the 0–20 cm soil layer, corresponding to the compared treatments. The residual effect of HCFA doses increasing from 100 to 800 Mg·ha⁻¹ caused a regular increase in the total content of Cd, Cr, Cu, Mn, Fe, Zn and Pb, as well as the forms of Zn, Cu, Mn, Fe and B soluble in 0.1 M HCl. The total content of the analyzed microelements increased by a maximum of 30% for cadmium up to 176% for zinc. The highest increase in the content of soluble forms ranged from 25% for Fe to 760% for boron. The share of Znbd, i.e. permanently bound to soil, to Zntot, i.e. the total zinc form, was positively correlated with pH in KCl, the C:N ratio and the content of Cu permanently bound with soil. Regarding the share of Febd in Fetot, correlations with pH in H₂O and in KCl, content of organic matter (SOM) and the C:N ratio were demonstrated. No such correlations were proven with respect to the other elements.

PL

W doświadczeniu założonym w 1984 roku badano działanie melioracyjnych dawek popiołów ze spalania węgla kamiennego (hard coal fly ashes – HCFA) na właściwości fizykochemiczne gleby oraz na plonowanie i skład chemiczny roślin uprawnych. W pierwszych latach badań uprawiano typowe rośliny rolnicze, a w 1992 zmieniono charakter uprawy na trwały użytek zielony. Obecne badania wykonano po dwudziestu dziewięciu latach od zastosowania HCFA. Próbki gleby pobrano z poziomu 0–20 cm w nawiązaniu do porównywanych obiektów. Następcze działanie rosnących dawek HCFA od 100 do 800 Mg·ha⁻¹ powodowało zarówno wyraźnie regularny wzrost zawartości całkowitej – Cd, Cr, Cu, Mn, Fe, Zn i Pb, jak i form rozpuszczalnych w 0.1 M HCl – Zn, Cu, Mn, Fe i B. Zawartość całkowita rozpatrywanych mikroskładników maksymalnie wzrosła o 30% w przypadku kadmu do 176 % w odniesieniu do cynku. Maksymalny wzrost zawartości form rozpuszczalnych kształtował się od 25 % w odniesieniu do żelaza do 760 % w przypadku boru. Udział Znbd tj. trwale związanego z glebą w stosunku do jego formy ogólnej Zntot, istotnie dodatnio korelował z pH w KCl i stosunek C:N oraz z Cu trwale związaną z glebą. W odniesieniu do udziału Febd w Fetot wykazano korelacje z pH w H₂O, pH w KCl, SOM i C:N ratio. W odniesieniu do pozostałych badanych pierwiastków takich zależności nie wykazano.

20

Heavy metal concentrations in soil and agricultural products near an industrial district

63%

Guo Y.-B. , Feng H. , Chen C. , Jia C.-J. , Xiong F. , Lu Y.

Polish Journal of Environmental Studies

|

2013

|

tom 22

|

nr 5

EN

This study investigated heavy metals in soils and agricultural products near an industrial district in Dongguan City. The concentrations of Cu, Zn, Pb, Cd, Hg, and As in soil and agricultural products from vegetable and banana fields were determined. Results indicated that except for Zn in one sample and Cd in five samples, the majority of the samples were notably enriched by heavy metals compared with background values. The concentrations of heavy metals (mg·kg⁻¹ dry soil) in agricultural soils in the study area ranged from 22.2 to 93.0 for Cu, 31.2 to 213.6 for Zn, 47.6 to 133.5 for Pb, 0.01 to 0.67 for Cd, 0.15 to 0.56 for Hg, and 20.5 to 28.9 for As. Among these soil samples, concentrations of Cu, Zn, Cd, and Hg in 20.6%, 8.8%, 29.4% and 38.2% soil samples, respectively, exceeded Chinese maximum allowable concentrations (MAC) for agricultural soil. The concentrations of Zn, Pb, and Cd were significantly higher in vegetable than in banana fields. Cu, Zn, Pb, Cd, and Hg accumulated in the topsoil of vegetable fields, but only Pb and Hg accumulated in banana fields. Zn, Cd, and Hg accumulated more easily in flowering cabbage than other vegetables. Cu, Zn, and As were accumulated more easily in banana than lettuce, bunching onion and eggplant. Therefore, the findings suggest more attention should be focused on the accumulation of heavy metals in banana. This study presents a practical methodology for screening crops with lower bio-concentration factors for heavy metals to reduce metal contaminants in the general food supply chain.