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Texture and composition of the Rosa Marina beach sands (Adriatic coast, southern Italy): a sedimentological/ecological approach

Moretti M., Tropeano M., van Loon A. J., Acquafredda P., Baldacconi R., Festa V., Lisco S., Mastronuzzi G., Moretti V., Scotti R.

Geologos

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2016

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Vol. 22, No. 2

87--103

EN

Beach sands from the Rosa Marina locality (Adriatic coast, southern Italy) were analysed mainly microscopically in order to trace the source areas of their lithoclastic and bioclastic components. The main cropping out sedimentary units were also studied with the objective to identify the potential source areas of lithoclasts. This allowed to establish how the various rock units contribute to the formation of beach sands. The analysis of the bioclastic components allows to estimate the actual role of organisms regarding the supply of this material to the beach. Identification of taxa that are present in the beach sands as shell fragments or other remains was carried out at the genus or family level. Ecological investigation of the same beach and the recognition of sub-environments (mainly distinguished on the basis of the nature of the substrate and of the water depth) was the key topic that allowed to establish the actual source areas of bioclasts in the Rosa Marina beach sands. The sedimentological analysis (including a physical study of the beach and the calculation of some statistical parameters concerning the grain-size curves) shows that the Rosa Marina beach is nowadays subject to erosion.

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Investigation of the Results of Combined Reclamation on the Particular Stages of Grain Matrix Recovery

Łucarz M., Dańko R., Dereń M., Skrzyński M.

Archives of Metallurgy and Materials

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2016

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Vol. 61, iss. 4

2151--2158

EN

In this article, there were presented the results of research on combined mechanical and thermal regeneration of waste moulding sand with furfuryl resin originated from one of national foundries manufacturing aluminium alloys castings. Attempts of mechanical reclamation were led on the REGMAS reclaimer enabling to realize preliminary and primary reclamation with use of two modes of mechanical interactions on waste moulding sand. In the first attempt the reclaimer worked without any additional regenerating elements, and as the second solution, the reclaimer operated with additional crushing and abrasive elements to increase the result of primary reclamation. Thermal reclamation was led in the prototypic thermal reclaimer, enabling to fully control the process of grain matrix recovery. As a result of completed investigations the small efficiency of mechanical reclamation was determined. However, use of combined regeneration allowed for obtaining grain matrix of high purity. Thermal regeneration was conducted in prototypic thermal reclaimer. Evaluation of reclaim (reclaimed material) quality was carried out in the way of iginition losses and grain-size analysis, surface morphology and also by executing of strength testing of moulding sand prepared on obtained grain matrix for the particular reclamation operations.

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Przestrzenny rozkład niklu w osadach dennych zbiornika Goczałkowice

Czaplicka-Kotas A., Ślusarczyk Z.

Technologia Wody

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2013

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Nr 10 (30)

34--39

PL

Zbadano przestrzenne zróżnicowanie stężeń niklu we frakcji mniejszej niż 0,2 mm osadów7 dennych w obrębie Zbiornika Goczałkowice. Badania zawartości niklu w osadach dennych obejmowały 26 punktów pomiarowych usytuowanych wzdłuż prawego i lewego brzegu zbiornika oraz wzdłuż jego osi głównej. W tych samych punktach pomiarowych uzyskano wyniki dotyczące analizy granulometrycznej osadów oraz zawartości w osadach substancji organicznej. Wykazano korelacje pomiędzy stężeniem niklu w osadach a frakcją ilastą (wsp. korelacji Spearmana 0,87), oraz pomiędzy stężeniem niklu w osadach a zawartością substancji organicznej (wsp. korelacji Spearmana 0,76). Wykazano przestrzenne rozkłady stężeń niklu w osadach dennych zbiornika ze względu na przynależność punktów pomiarowych: do opisanych wyżej transektów, do starego koryta Wisły w obrębie Zbiornika Goczałkowice i pozostałych punktów pomiarowych oraz do płytkiej i głębokiej części zbiornika. Stężenie niklu w osadach dennych Zbiornika Goczałkowice wynosi od 8,7 mg/kg do 40,9 mg/kg i praktycznie nie przekracza wartości uznanej za tło geochemiczne dla Wisły, które według Helios -Rybickiej wynosi 40 mg/kg. W celu dokonania oceny szkodliwości niklu zawartego w osadach zbiornika posłużono się kryterium ekotoksykologicznym opartym o dwie progowe wartości LEL (lowest effect level) oraz SEL (severe effect level). Wartość LEL dla stężenia niklu w osadach wynosi 16 mg/kg, a wartość SEL 73 mg/kg. W Zbiorniku Goczałkowice wartość LEL dla próbek osadów dennych została przekroczona w 13 na 26 punktów pomiarowych, co świadczy o potencjalnym toksycznym wpływie osadów na organizmy bentosowe, natomiast wartość SEL nie została przekroczona w żadnym punkcie pomiarowym.

EN

The study examined the variation of nickel content in fraction lower than 0,2 mm of bottom sediments collected from the Goczałkowice Reservoir. The examination of Ni content in the bottom sediments includes 26 stations situated along the left and right shore and the long axis of the reservoir. The grain-size fractions and organic matter content in the bottom sediments were also determined in the sediment samples collected from those stations. Results indicated that there was correlation between the concentration of Ni and the clay fraction in the bottom sediments (Spearman Correlation Coefficient 0,87) and between the concentration of Ni and the organic matter in the bottom sediments (Spearman Correlation Coefficient 0,76). Results also showed a spatial distribution of Ni in the bottom sediments of the reservoir in view of belonging stations to: transects as described above, the old river-bed of the Vistula River within Goczałkowice Reservoir, the other stations and the shallow and deep parts of the reservoir. Concentration of Ni in the sediments of the Goczałkowice Reservoir was in the range of 8,7-40,9 mg/kg and did not exceed the value of geochemical background for the Vistula River, which according to Helios - Rybicka is 40 mg/kg. In order to asses a toxicological hazard of Ni concentrated in the bottom sediments of the reservoir the sediment quality objectives based on two threshold values - LEL (lowest effect level) and SEL (severe effect level) - were used. The LEL value for Ni concentration in the sediments is 16 mg/kg and the SEL value is 73 mg/kg. In the Goczałkowice Reservoir the LEL value for sediment samples was exceeded in 13 out of 26 stations, which indicates that potential ecotoxic effects on bottom organisms might occur. The SEL value was not exceeded in any station.

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Optical methods in the grain-size analysis of fine-grained sediments

Issmer K.

Geological Quarterly

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2000

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Vol. 44, Nr 2

205-210

EN

Optical methods now dominate the grain-size analysis of fine-grained sediments, because of their rapidity. The growing application of optical methods leads to statistical comparison of their results against those from sedimentation methods. Here, the Kołmogorow-Smirnow non-parametric test is demonstrated. Most agreement exists in the 50-20 and 20-6 mm fraction. In order to compare the optical and the combined methods, correlation ratios were calculated for all commonly used grain-size fractions. Regression equations were established for the 50-20 mm fraction.