摘要
用分光光度法测定BI废水中微量钴〔Ⅱ〕含量 ,在 pH =5.0～ 7.0溶液中 ,用NH4SCN作显色剂 ,饱和NaF溶液作掩蔽剂 ,丙酮作稳定剂 ,去离子水作参比 ,在 61 8nm处直接测定吸光度 .测标准试样的吸光度 ,作工作曲线 .然后测试样的吸光度 ,通过工作曲线求钴〔Ⅱ〕的含量 .此法测钴〔Ⅱ〕含量回收率在 98.5%～ 1 0 0 .5%之间 .分光光度法与化学法比较 ,分光光度法相对标准偏差CV =5.6‰ ,化学法相对标准偏差CV =2 5.8‰ ,精密度与准确度都很好 ,重现性好 ,选择性好 ,干扰小 ,操作方便 ,不需对样品进行处理 ,测定迅速 ,适合化工生产和环境监测 .
When using spectrophotometry to determine the minute quantity et cobaltus 〔Ⅱ〕ion in BI water we used NH 4SCN as color agent and saturated NaF solution as cover aget and acetone as stabilizer in the solution with Ph value of 5.0～7.0.We can directly determine the adsorption at 618 nm and with deionized water as reference and then determine the absorption at the standard sample to make work curve.Then we determind the absorption of the sample and obtained the content of cobaltous 〔Ⅱ〕 ion through the work curve.By this method,the recovery was among 98.5%～100.5%.Compared with chemical method ,the spetrophotometny′s relative standard deviation CV was 5.6‰,while the chemical method′s standard deviation CV was 25.8‰ it′s accuracy and property are both good,its appearance was good and with betteor selection.The disturbance at this method was small and its operation was convenient.There is no need to handle the sample and it′s determination was repid.It was adaptable to production in the chemical industry and the detection of enviroment.
关键词
分光光度法
测定
BI废水
钴
吸光度
废水监测
Spectrophotometny
BI wader
Minte uqantity Cobaltous〔Ⅱ〕 ion
absorption
