摘要
建立了在盐酸介质中测定二氧化硒的碘量滴定法。在溶有二氧化硒的0.4～0.5mol/L盐酸介质中,加入过量的碘化钾,于暗处放置5min后,加入三氧甲烷吸附反应生成的硒,以淀粉为指示剂,用硫代硫酸钠标准溶液滴定析出的碘,测得二氧化硒的含量。加入三氯甲烷吸附反应生成的硒,使滴定终点敏锐。该方法克服了单体硒对测定的影响,测定结果与分离单体硒后的行业标准测定的结果相符,适合于含量大于96%的工业二氧化硒中SeO2的测定。加标回收率99.7%～100.3%,相对标准偏差在0.11%～0.19%。
An iodimetry method for determination of selenium dioxide in the medium of hydrochloric acid is established. Excessive potassium iodide was added into solution of selenium dioxide in 0.4-0.5 mol/L hydrochloric acid. After the solution was kept in the dark for five minutes,chlorofor .m was added into it to adsorb selenium formed by previous reaction, then iodine separated out was determined by sodium hyposulfite titration using starch as the indicator,at last the content of selenium dioxide in the sample was found. A sharp ending point was achieved by adding chloroform to adsorb selenium in the titration. The results are in good agreement with those obtained from industrial standard method. The method has been applied to determine the content of SeO2 of more than 96 % in the industrial selenium dioxide with the recoveries of 99.7%- 100.3% and the relative standard deviations of 0.11%- 0.19%.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2007年第9期70-72,共3页
Metallurgical Analysis
基金
国家TC243/SC2计划项目
关键词
工业二氧化硒
单体硒
硫代硫酸钠
碘
三氯甲烷
滴定
industrial selenium dioxide
free selenium
sodium hyposulfite
iodine
chloroform
titration
