Determination of Mercury Binding Forms in Contaminated Soils: Mercury Pyrolysis versus Sequential Extractions

摘要: Binding forms of mercury (Hg) in contaminated soils were studied by means a pyrolysis method and sequential leaching procedure (SEP). Changes the Hg-binding occurring during extraction characterized determination thermal release characteristics after each step. Soil samples selected from site former chloralkali plant, wood preservation site, two mining areas metallic (Hg0), mercury(II) chloride (HgCl2), or sulfide (HgS), respectively. The results show that Hg0, matrix-bound Hg, HgS could be identified their behavior. In contrast, obtained leach ing did not allow identification any specific Hg compounds as all most is extracted nonspecific residual fraction. Results pyrolitic measurements step demonstrated insufficient selectivity use...