Contribution to a Statistical Analysis of the Correlation Between the Adsorption of Heavy Metals and the Level of Carbonates in Soils
Kessab, Amira | Guimer, Kamel | Hakem, Ahcene | Fateh, Mimeche | Mohamed, Hachi
We have chosen hexavalent chromium as a metal for our work, Hexavalent chromium (Cr) pollution is a serious problem affecting health and the environment. This study is based on a statistical analysis applying a correlation between the level of carbonates in soils and the retention of Chromium (VI) by soil carbonates alone. The retention study was carried out using a batch method for an equilibrium time of 1h and at 23 °C on 24 soils for a limestone soil type from the soil map of the Djelfa region (Algeria), with different total limestone concentrations. The carbonates were then extracted using the Tessier (1979) procedure. Analyses indicate a significant positive linear relationship between carbonate content and chromium retention by carbonates. This relationship, confirmed by various statistical methods (Pearson correlation, Spearman rank correlation, etc.), indicates that the two variables are intrinsically correlated, implying that soil carbonates play a very important role in the retention of pollutants in soils, The results of these analyses have several important practical implications, the most important of which is for farmers to incorporate carbonate-based amendments to improve pollutant retention in soils.
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