Adsorption of Copper by Alluvial-delluvial Soil Treated with Different Meliorants | Адсорбция на мед от Алувиално-делувиалнa почва, третирана с различни мелиоранти
2013
Atanasova, I., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria) | Benkova, M., N. Pushkarov Institute of Soil Science, Sofia (Bulgaria)
Copper adsorption of increasing soil concentrations 62.5 – 2000 mg/kg by a degraded polluted with copper Alluvial-delluvial soil from the area of Zlatitsa and soil variants treated with peat, CaO and CaO/glauconite/phosphorite was evalated. It was found that adsorption of the non-meliorated and peat meliorated soil was characterised by the presence of adsorption maxima of 909 and 714 mg/kg in the highly acid pH range of 4.4 – 3.7 which is an indication of low surface affinity for copper. In the soils meliorated with CaO and CaO/glauconite/phosphorite, Cu adsorption follows a straight line in the pH range of 6.1 – 4.7. The calculated distribution coefficients Kd, however also show low affinity for Cu. With the mineral ameliorants in the weakly acid pH range of рН 6.1 – 5.6 surface loadings ~ 500 mg/kg Cu adsorption takes place as specific sorption and follows a straight line characterised by higher values of the distribution coefficient Kd. The results obtained indicate that an Alluvial-delluvial soil already polluted with copper 845 mg/kg adsorbs additionally ~ 500 mg/kg at specific sites. Higher Cu loadings lead to soil acidification, higher mobilisation of Cu in solution and suppression of the ameliorant activity.
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