Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Soil pollution of selected PHAs as a factor affecting the properties of humic acids

Dębska B., Banach-Szott M, Rosa E.

Journal of Ecological Engineering

2014

Vol. 15, nr 1

67--73

It is well-known that the properties of humus soil substances (including humic acids) are soil-type-specific. However, one shall consider the fact that properties of organic matter of soil can be modified by farming system (crop rotation, fertilisation) as well as other external factors, including pollutants; PAHs. The objective of the paper is to determine the effect of a single-time pollution of soils with high rates of PAHs on the properties of humic acids. The research was performed with the samples of soils representative for the Kujawy and Pomorze Region (Phaeozems, Luvisol, Haplic Arenosols, Fluvisols). Soil samples were polluted with selected PAHs; fluorene, anthracene, pyrene and chrysene at the amount corresponding to 100 mg PAHs kg-1. Treatments, i.e., soils + PAHs, were incubated for 180 and 360 days at the temperature of 20–25 ºC and at constant moisture of 50% of field water capacity. Humic acids were extracted from the soil samples prior to and after 180 and 360 days of incubation. The following analyses were performed for separating humic acids: elemental composition, UV-VIS and IR spectrophotometric analyses, susceptibility to oxidation. Results demonstrated that a single introduction of fluorene, anthracene, pyrene and chrysene at very high rates into soils affects the properties of humic acids. There was mostly recorded a de-crease in coefficients of absorbance A2/6 and A4/6, an increase in the parameter defining the susceptibility of humic acids to oxidation. There were also noted changes in the pattern of spectra in infrared and the values of the parameter defining the degree of internal oxidation of the humic acids molecules.

Properties of Humic Acids of Luvisols Polluted with Selected PAHs

Dębska B., Banach-Szott M., Rosa E., Drąg M.

Ecological Chemistry and Engineering. A

2013

Vol. 20, nr 3

339--350

The aim of the present paper was to determine the effect of soil pollution with polycyclic aromatic hydrocarbons (PAHs) on the properties of humic acids. The study was carried out based on Luvisols samples representative of the Kujawsko-Pomorskie Region, collected from areas exposed to and protected from direct pollution with PAHs. Soil samples were polluted with selected PAHs (fluorene, anthracene, pyrene and chrysene), at the amount corresponding to 10 mg PAHs/kg. The PAHs-polluted soil samples were incubated for 10, 30, 60, 120, 180 and 360 days at the temperature of 20–25 oC and fixed moisture (50 % of field water capacity). From the soil samples, before and after 180 and 360 days incubation, there were isolated humic acids (HAs), applying the common IHSS method. For isolated HAs the following analyses were made: elemental composition, UV-VIS and IR spectra spectrometric analysis, susceptibility to oxidation and hydrophilic and hydrophobic properties was determined with HPLC used. It was demonstrated that introducing PAHs into soils resulted in a change in some quality parameters of humic acids. There were found eg a decrease in the value of the degree of internal oxidation, an increase in the intensity of absorption bands in the range 1520–1000 cm–1, an increase in the susceptibility to oxidation, a decrease in the share of hydrophilic fractions and an increase in the hydrophobic fractions. The soil pollution with PAHs is, therefore, one of the many factors which can modify the humic acids properties.

Celem pracy było określenie wpływu zanieczyszczeń gleb wielopierścieniowymi węglowodorami aromatycznymi (WWA) na właściwości kwasów huminowych. Badania zrealizowano dla próbek gleb płowych reprezentatywnych dla Regionu Kujawsko-Pomorskiego, pobrane z terenów narażonych i nienarażonych na bezpośrednie zanieczyszczenia WWA. Próbki gleb zanieczyszczono wybranymi WWA – fluoren, antracen, piren i chryzen – w ilości odpowiadającej 10 mg WWA/kg. Zanieczyszczone przez WWA próbki gleb inkubowano 10, 30, 60, 120, 180 i 360 dni w temperaturze 20–25 oC i w stałej wilgotności – 50 % PPW. Z próbek gleb przed oraz po 180 i 360 dniach inkubacji wyekstrahowano kwasy huminowe. Dla wyseparowanych kwasów huminowych, ogólnie przyjętą metodą IHSS, przeprowadzono analizy: składu pierwiastkowego, spektrofotometryczne w zakresie UV-VIS i IR, podatności na utlenianie oraz oznaczono właściwości hydrofilowo-hydrofobowe z wykorzystaniem HPLC. Wykazano, że wprowadzenie WWA do gleb skutkowało zmianą niektórych parametrów jakościowych kwasów huminowych. Stwierdzono m.in. spadek wartości stopnia utlenienia wewnętrznego, wzrost intensywności pasm absorpcyjnych w zakresie 1520–1000 cm–1, wzrost podatności na utlenianie, spadek udziału frakcji hydrofilowych, a wzrost frakcji hydrofobowych. Zanieczyszczenie gleb WWA jest więc jednym z wielu czynników, które mogą modyfikować właściwości kwasów huminowych.