离子色谱法测定废水中硫化物

用蒸馏法对废水进行预处理,磷酸对样品进行酸化使其释放硫化氢,氢氧化钠溶液进行吸收,离子色谱法进行测定。该方法检出限为0.003mg/L,在0.03～10mg/L浓度范围内线性良好,相对标准偏差分别为7.40%、4.31%,实际样品加标回收率在92.0%～117.4%之间。离子色谱法与化学法间相对偏差为4.58%～13.3%。该方法操作简便,灵敏度高,精确度和准确度高,便于推广,适合废水中硫化物的测定。

Determination of Sulfide in Wastewater by Ion Chromatography

Based on determination of sulfides in wastewater by ion chromatography,wastewater was pretreated by using distillation of which wastewater samples were acidified with phosphoric acid to release hydrogen sulfide,absorbed with sodium hydroxide solution,then determined by ion chromatography.The method detection limit is 0.003 mg/L,the good linear relationship is in the range of 0.03～10 mg/L,the relative standard deviation is 7.40％ and 4.31％,respectively,the addition standard recovery of actual sample is 92.0％～117.4％.Relative deviation of ion chromatography method and chemical method is 4.58％～13.3％.This method is easy to spread for determination of sulfide in the wastewater owe to its easy operation,high sensitivity,precision and accuracy.