SKALAR SAN++5块连续流动分析仪在水质六价铬监测中的应用

Application of SKALAR SAN++5 blocks continuous flow analyzer in monitoring of hexavalent chromium in water

目的探索SKALAR SAN++5块连续流动分析仪在水质六价铬监测中的应用。方法采集生活饮用水,包括自备井水和末梢水。通过SKALAR SAN++5块连续流动分析仪导入水样,经过蠕动泵挤压泵管,将水样与二苯碳酰二肼硫酸溶液按照一定比例吸入并发生反应,生成紫红色配合物,于550 nm波长处测定吸光度值,再通过数据转换器分析计算六价铬含量。结果本法在0.0 mg/L~0.3 mg/L的线性范围内呈现出良好的线性关系,r>0.9999。方法检出限为0.0015 mg/L,方法定量限为0.005 mg/L。在生活饮用水中分别进行0.02 mg/L、0.10 mg/L和0.30 mg/L 3个浓度水平的加标回收实验,平均回收率为100.0%~103.3%,相对标准差≤2.5%。应用本方法分别对北京市朝阳区农村地区丰水期和枯水期的183份生活饮用水中六价铬进行检测,丰水期六价铬浓度为-0.0012 mg/L~0.0292 mg/L,检出率为55.17%,枯水期六价铬浓度为-0.0004 mg/L~0.0266 mg/L,检出率为53.73%,合格率均为100%。结论该方法稳定、准确、灵敏、快速、省力、环保,满足生活饮用水中水质六价铬监测的需求。

Objective To explore the application of SKALAR SAN++5 blocks continuous flow analyzers in the monitoring of hexavalent chromium in water.Methods The domestic drinking water samples including self-provided well water and peripheral water were collected.The water sample was introduced into a SKALAR SAN++5 blocks continuous flow analyzer and reacted with diphenylcarbazide sulfuric acid solution to form a purple complex whose absorbance was measured at 550 nm,and the results were calculated by data converter.Results The method had good linearity within 0.0 mg/L-0.3 mg/L(r>0.9999).The method detection limit(LOD)was 0.0015 mg/L and the method quantification limit(LOQ)was 0.005 mg/L.Three concentration levels of 0.02 mg/L,0.10 mg/L and 0.30 mg/L were added and recovered in the drinking water,and the average recovery rates were within 100.0%-103.3%(RSD≤2.5%).This method was used to detect hexavalent chromium in 183pieces of drinking water in the wet and dry periods in rural areas of Chaoyang District,Beijing.The concentration of hexavalent chromium in the wet period was within-0.0012 mg/L-0.0292 mg/L.The detection rate was 55.17%,the concentration of hexavalent chromium during the dry season was within-0.0004 mg/L-0.0266 mg/L,the detection rate was 53.73%,and the pass rate was 100%.Conclusion The method is stable,accurate,sensitive,quick,labor-saving and environmental benign.It meets the needs of hexavalent chromium monitoring in drinking water.