摘要
研究了含铬废水的处理及微量铬的测定 .用硫酸亚铁铵作还原剂将Cr(VI)还原为Cr(III) ,利用共陈淀原理 ,可以基本除去Cr(III) .此方法适用于含Cr(VI)废水的处理 .体系中微量铬用增敏碘量法测定 ,增敏倍数是 9.Cr(III)的测定方法是用过量高碘酸盐氧化 ,钼酸盐掩蔽未反应的高碘酸盐 ,最后以碘量法滴定产生的碘酸盐 .Cr(VI)在用饱和亚硫酸钠预先还原为Cr(III)后 ,也可用该方法测定 .当铬含量小于 3 4 0 μg时 ,其平均回收率是 99.7% .
The methods are studied for treatment an iodometric microdetermination of chromium in waste water. Cr(III) can be reduced from Cr(VI) with Fe(NH 4) 2(SO 4) 2·6H 2O as reductant then be removed mostly with the co precipitation. The proposed method can be used to treat the waste water with Cr(VI). The microgram amount of chromium system can be determined by iodometric complification method. The method offers 9 fold amplification for Cr(III). The method is based on oxidation of Cr(III) with an excess of periodate, masking the unreacted periodate with molybdate and subsequent iodomertric determination of the liberated iodate. Cr(VI) can be determined by this method after prior reduction to Cr(III) with saturated sodium sulphite in sulphuric acid. When the amount of chromium is less than 340 μg,the average recovery obtained is 99.7%.
出处
《中国科学院研究生院学报》
CAS
CSCD
2001年第1期37-42,共6页
Journal of the Graduate School of the Chinese Academy of Sciences
关键词
铬
增敏反应
废水处理
碘量法
高碘酸盐
chromium, amplification reaction, iodometry, treatment of waste water, periodate
