Heavy metal distribution between fractions of humic substances in heavily polluted soils

摘要: Soil organic maer is important in controlling heavy metal behaviour soils. This study aims to determine the distribution of organically bound Cd, Pb, and Zn between humic fulvic acids 20 samples heavily polluted Fluvisols. Traditional procedure alkaline sodium hydroxide/pyrophosphate extraction substances with consequent precipitation by acidification was used. All three metals were predominantly on (mean share 98.4, 82.0, 95.7% total content, respective- ly). Mainly level pollution controlled amount acids. On acids, a limited specific sorption sites for expected. Lead content negatively corre - lated soil pH. The results suggest relatively high potential mobility fractions soils under this study. selectivity extracting agent briefly discussed.