硫化锌沉淀分离-EDTA滴定法测定废水中硫化物  

Determination of sulfide in waste water by EDTA titrimetry after precipitation with zinc sulfide

作　　者：王瑞斌[1] 胡满成[2] 

机构地区：[1]榆林学院化学与化学工程学院,陕西榆林719000 [2]陕西师范大学化学与材料科学学院,陕西西安710062

出　　处：《冶金分析》2008年第9期71-73,共3页Metallurgical Analysis

基　　金：榆林学院科研基金资助项目(YLXY07012)

摘　　要：水样经盐酸酸化,将其中的HS-和S2-全部转化为H2S,加入过量的金属锌,反应产生的大量氢气作为载气与一并逸出的硫化氢通入热的氨性溶液及过量的锌标准吸收液中,以铬黑T为指示剂,用EDTA标准滴定溶液滴定形成ZnS沉淀后的剩余Zn2＋,实现了采用吹气吸收-沉淀分离-EDTA滴定法测定实验室废水中硫化物含量的方法。讨论了水样的酸化效果,吸收液选择,气体分离等实验条件对测定的影响,避免了碘量法所产生的干扰。测定结果与标准方法相符合,相对标准偏差为3.02%~3.08%,加标回收率在96.0%~99.5%之间。HS and S2 in water sample were translated into H2S after acidification with HCl. Then excessive metal zinc was added, H2S and lots of generated H2 as carrier were passed through hot am moniacal solution and excessive Zn standard absorption solution. The residual Zn2＋ after precipitation of ZnS was titrated with standard EDTA titration solution using chrome black T as indicator. This method realized the determination of sulfide in laboratory wastewater by aeration absorption-precipita- tion separation-EDTA titrimetry. The effect of some experimental conditions including the acidifica- tion of water sample,the selection of absorption solution and gas separation on determination was dis cussed, which avoided the interference of iodometric method. The measuring results were accordant with those obtained standard method. The RSD was 3. 020%--3.08% and the recovery of standard ad dition was in the range of 96.00%--99.5%.

关 键 词：吹气吸收 沉淀分离 EDTA滴定法 硫化物 废水 

分 类 号：X832[环境科学与工程—环境工程]