Immobilization of soil mercury by colloidal sulphur in the laboratory experiment

Abstract

Abstract: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 effectively 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.

Immobilization of mercury in field soil and sediment using carboxymethyl cellulose stabilized iron sulfide nanoparticles

“…Figure 4(a) shows the transient release of Hg when 2.7 g of sediment AL1 was mixed with 27 ml of DI water or the nanoparticle suspension containing various concentrations of FeS. The initial Hg peaking during the DI water leaching tests can be attributed to the heterogeneous Hg binding sites in the sediment, i.e., Hg is released from lower energy sites and then bound to higher energy sites [35]. In the absence of the nanoparticles, the aqueous phase concentration of Hg reached 87.13 ± 9.08 µg l −1 during the 48 h of leaching tests.…”

Stabilization and Solidification of Elemental Mercury for Safe Disposal and/or Long-Term Storage

“…Several alternative S/S technologies have been reported for the treatment of mercury wastes. [9][10][11][12][13][14][15][16][17] The technology that converts mercury into mercury sulfide by reacting it with a sulfur compound is one of the most widely used methods for safe disposal of mercury. 9,10,13,14,16,17 This product is more stable and environmentally benign than elemental mercury due to its high insolubility and low vapor pressure.…”