流动注射法同时检测水中挥发酚和氰化物

目的建立连续流动注射分析仪同时测定末梢水中挥发酚和氰化物的分析方法。方法末梢水经过EDTA和抗坏血酸的混合溶液(20.0 g/L)预处理,用连续流动注射分析仪同时测定挥发酚和氰化物。结果末梢水样品预处理的条件为50 ml水样中加入0.5 ml EDTA和抗坏血酸的混合溶液(20.0 g/L),加标回收率为90.0%~105.0%,相对标准偏差为0.39%~5.85%,挥发酚和氰化物的检出限分别为0.000 2和0.000 4 mg/L。结论该方法精密度好,准确度高,符合分析质控要求。

Study on the simultaneous determination of volatile phenol and cyanide in the tap water by flow injection analysis

Objective To establish a flow injection analysis method for simultaneous determination of volatile phenol and cyanide in tap water. Methods The tap water was pretreated by a mixed solution of EDTA and ascorbic acid (20.0 g/L), and the flow injection analyzer was used for simultaneous determination of volatile phenol and cyanide. Results The result show that the mixed solution of EDTA and ascorbic acid (20.0 g/L) of 0.5 ml in 50 ml tap water was the best pretreatment. The recovery rate of the tap water was 90.0%-105.0%, and the relative standard deviation was 0.39%-5.85%. The detection limits of volatile phenol and cyanide were 0.000 2 and 0.000 4 mg/L. Conclusion This method showed good precision, high accuracy, and met the requirements of quality control.