Influence of acetochlor on Pb forms and their bioavailability in phaiozem of northeast China
乙草胺对东北黑土铅形态及生物有效性的影响

By using Pb-fractionation analytical methods and Pb-acetochlor response experiments,it was studied the Pb forms in clean and polluted phaiozems of northeast China and the response of Pb bioavailability to acetochlor application.The results showed that the dominant Pb forms in these soils were low bio-available organic-sulfide Pb and residual Pb,and the concentrations of high bio-available water-soluble and exchangeable Pb were relatively low.However,the ratio of bio-available Pb to total Pb was lower in polluted phaiozem than in clean phaiozem.The bioavailability of Pb in the soil was obviously increased after high dose of acetochlor was applied.The main reason was the contribution of organic-sulfide Pb to bio-available Pb interacted with acetochlor.