关键词: 土壤, 锌, 铜, 结合态, 氯化钠融雪剂, 醋酸钙镁融雪剂

Abstract: Using laboratory simulation method, soil was soaked and leached with sodium chloride (NaCl) and calcium magnesium acetate (CMA), respectively, we determined the variation of mass ratio of binding states of Zn and Cu in soil by Tessier sequential extraction procedure, and investigated  the effects of two deicing salts on binding states of typical heavy metals in soil. The results show that NaCl has more obvious effect on heavy metals in soil than CMA, and the higher the concentration of NaCl, the greater the difference. Both Zn and Cu in soil tend to be converted into exchangeable state under the action of immersion of deicing salts, and exchangeable state of Zn increases by 115% at most. The leaching effect of deicing salts has a great effect on binding state of Zn, compared with distilled water leaching, the exchangeable and carbonate   states of Zn are reduceed by 30% and 20%, respectively, the effect on binding state of Cu is minor. The organic/sulfide binding state and residual state of Zn and Cu are little affected by immersion and leaching of deicing salts. CMA is more environmentfriendly than NaCl deicing salts.

Key words: soil, zinc, copper, binding state, NaCl deicing salt, CMA deicing salt