| Effects of humic acid on the form and distribution of lead in calcareous soil were explored, through the
incubation experiment indoor. The results showed that all the humic acid treatments could decrease the contents of EX-Pb
and Res-Pb, but increase the contents of FeMn-Pb, Ob-Pb and Cob-Pb. As more humic acid added, the more activity of
Pb was restrained. The influence within 36 days was that the contents of all the speciations of lead changed clearly, and
after 36 days the contents of each fractions did not change obviously as time went by. The lead in the fraction of FeMn-Pb
and Ob-Pb have most obvious correlation with humic acid with increasing humic acid in calcareous soil. The distribution
rate of the EX-Pb and Res-Pb are increased with more humic acid added,but FeMn-Pb,Ob-Pb and Cob-Pb were opposite.
The results also showed that humid acid had function in complexing the lead temporarily in calcareous soil. |
