Distribution of Different Fractions of Cd, Pb, Zn, and Cu in Industrially Polluted and Non-polluted Soils of Odda Region, Norway

Abstract

Fractionation of soil Cd, Pb, Zn and Cu by methanol extraction with 0.05 M CaCl2 (CA-Me), 2.5% acetic acid (AAC-Me), 0.1 M sodium pyrophosphate (PYR-Me), ammonium oxalate pH 3.25 under UV radiation (OX-Me) and HNO3-HCIO4 mixture (RES-Me) were carried out on polluted and non-polluted soils collected from the Odda region, Norway. The relationships between different Me-fractions and between Me-fractions and some soil variables were statistically examined. The results confirmed an equilibrium relationship between the different Me-fractions. The data indicated a strong influence of soil pH on the distribution of the CA-Me fraction. There was also an apparent association between soil organic matter and PYR-fraction, and between the so-called free Fe and Mn and OX-fractions. Similarities in the chemical behavior in soils between Cd and Zn and between Pb and Cu were noticed.