土壤中硫化物的分析方法研究  

Study on Determination Method for Sulfide in Soils

作　　者：匡华成[1] 赵哲[1] 杨洪彪[1] 

机构地区：[1]鞍山市环境监测中心站,辽宁鞍山114003

出　　处：《中国无机分析化学》2016年第4期11-14,共4页Chinese Journal of Inorganic Analytical Chemistry

摘　　要：硫化物作为土壤中常见的污染物在酸性环境中会生成H2S，造成环境污染，研究中根据环境质量要求分别针对土壤中易解析的硫化物、酸可溶解性硫化物、酸难溶性硫化物建立了相应的分析测定方法。硫化物分别在磷酸（1＋1）、浓硫酸、盐酸（9．8mol／L）作用下形成硫化氢，硫化氢随氮气进入装有乙酸锌吸收液的吸收瓶中，生成硫化锌沉淀，以碘量法定量。结果表明：酸难溶性硫化物的实际样品加标回收率为86％～98％；酸溶性硫化物的实际样品加标回收率为83％～91％，空白加标回收率为92％～97％。精密度实验中，酸溶性硫化物相对标准偏差为6．4％～8．3％。沙土、花园土、黄土、稻田土中酸难溶性硫化物的相对标准偏差分别为2．6％、4．0％、5．5％、5．8％。方法精密度和准确度满足分析要求，可以用来评估土壤中的硫化物污染问题，也可以了解不同类型硫化物的污染情况。As a common pollutant, sulfide in soil generates H2S in acidic environment, causing environmental pollution. In this paper, based on the requirement of environmental quality, the corresponding analytical methods were established separately for unstable sulfide, acid-soluble sulfide, and acid-insoluble sulfide in soils. Sulfide hydrogen is obtained by the reaction of sulfide with phosphoric acid （1＋1）, sulfate and hydrochloric acid （9.8 mol/L）, and then it was carried by nitrogen gas into an absorption flask with zinc acetate absorbing solution. The precipitation of zinc sulfide was formed in the absorption flask, and finally the content of sulfide was quantitatively determined by iodimetry. The results indicated that the recoveries for acid-insoluble sulfide, acid-soluble sulfide and blank were 86%- 98%, 83 % - 91% and 92 %- 97 %, respectively. The relative standard deviations （RSDs） for acid-soluble sulfide and acid-insoluble sulfide （sandy soil, garden soil, loess plateau and paddy soil） were 6.4%-8.3% and 2. 6%-5.8%, respectively. Since the precision and accuracy of the method meet the requirement of analysis, so the method can be suitable for the determination of sulfide in soils. The results may be useful for assessing the pollution problems caused by sulfide in soils and understanding the pollution status of the different kinds of sulfide materials.

关 键 词：易解析硫化物 酸溶性硫化物 酸难溶性硫化物 碘量法 

分 类 号：O655[理学—分析化学]