Mobility and fractional composition of Cu compounds in chernozem calcic in the conditions of model experiment
2nd World Congress and Expo on Recycling
July 25-27, 2016 Berlin, Germany

Bauer Tatiana, Tatiana Minkina and Svetlana Sushkova

Southern Federal University, Russia

Posters & Accepted Abstracts: Int J Waste Resour

Abstract:

The present study is aimed at identifying the regularities in transformation processes of exogenic Cu compounds in calcic Chernozem of Rostov region (Russia). Parallel extractions were employed to study Cu mobile forms, using the following reagents: 1 N NH4OAC at pH 4.8 for extraction of the exchangeable forms; 1% EDTA in NH4OAC at pH 4.8 for the exchangeable and complex forms. 1 N HCl extracted specifically sorbed forms. The sum of the exchangeable, complex and specifically sorbed forms is weakly bound compounds. In order to study the interaction between metal and soil components, the fractional analysis by Tessier�??s method was made in soil samples contaminated with metal acetate salts. This procedure ensures the separation of five fractions of metal compounds: Exchangeable, bound to carbonates, bound to Fe, Al, and Mn (hydr)oxides, bound to organic matter and residual fraction. Metal concentration in solutions was determined by atomic-absorption spectroscopy. The Cu distribution in forms of compounds within the uncontaminated and contaminated soils is identical and can be presented according to the following order, mg kg-1: no metal addition: specifically sorbed (2.2±0.3) > complex (0.5±0.1) > exchangeable (0.3±0.01), the dose 300 mg kg-1 of metal: specifically sorbed (213.3±1.4) > complex (63.9±5.9) > exchangeable (107.6±11.7). Based upon a model experiment, it has been established that in non-contaminated soils the main Cu share is predominantly concentrated in crystalline litters of the primary and secondary minerals (38% of the total content). In contaminated soils, the metal are found to be in the fraction bound to the organic matter (32%).

Biography :

Email: bauertatyana@mail.ru