Immobilization of soil mercury by colloidal sulphur in the laboratory experiment

摘要

The results of the laboratory pot experiments on soil mercury(Hg)immobilisation with a non-toxic and price-reasonable agent-colloidal sulphur(S)water suspension,are presented.It was shown that fertilisation with small agrochemical doses of colloidal S reduces excess Hg e?ectively as follows:in interstitial waters by a factor 2-12 times for total Hg,and 22-680 times for"reactive"Hg; in stems and leaves of oats-7-22 times;and in moss bags,reflecting soil Hg degassing,7-15 times, for the most heavily Hg-spiked soils.The results obtained allowed to conclude that the immobilization of Hg occurs through Hg binding to the newly formed S-bearing functional groups in humic acids and/or sulphides.