抗坏血酸保存连续流动注射法用于生活饮用水中挥发酚和氰化物的测定

冯奋栋; 赖少阳; 叶小莉

doi:10.13421/j.cnki.hjwsxzz.2021.01.019

抗坏血酸保存连续流动注射法用于生活饮用水中挥发酚和氰化物的测定

Determination of Volatile Phenol and Cyanide by Continuous Flow Injection Method in Drinking Water with Ascorbic Acid Preserved

摘要

摘要:
目的对《生活饮用水标准检验方法水样的采集与保存》（GB/T 5750.2-2006）中挥发酚、氰化物水样的保存方法进行优化。
方法水样使用浓度为2.0 g/L抗坏血酸溶液去除残留余氯后，在连续流动注射系统上测定挥发酚、氰化物。
结果该方法预处理水样后，挥发酚和氰化物高低浓度的加标回收率为93.6%~105.0%，相对标准偏差为2.24%~3.34%，挥发酚的检出限是0.000 8 mg/L，氰化物的检出限是0.001 mg/L。与国家标准方法比较，实验室测定结果经t检验，结果差异无统计学意义（t=1.72，P>0.05）。
结论抗坏血酸替代亚砷酸钠去除水样中的残留余氯，检测挥发酚和氰化物不影响测定结果，可以开展日常监测。

Abstract:
Objective To improve the preservation method for water samples containing volatile phenol and cyanide based on Standard examination method for drinking water-Collection and preservation of water samples(GB/T 5750.2-2006).
Methods Volatile phenol and cyanide in water samples are determined by adopting a continuous flow injection system with ascorbic acid (2.0 g/L) pretreatment to remove the residual chlorine.
Results After performing the pretreatment on water samples, the spike recovery range for volatile phenol and cyanide was 93.6%-105.0%, with a relative standard deviation from 2.24% to 3.34%; the detection limit of volatile phenol was 0.000 8 mg/L and that of cyanide was 0.001 mg/L. Compared with the national standard method, the result determined by this method had no statistical difference after student's t-test (t=1.72, P>0.05).
Conclusion Replacing sodium arsenite with ascorbic acid for the removal of residual chlorine in water samples does not affect the result for volatile phenol and cyanide determination and could, therefore, be applied for daily monitoring of volatile phenol and cyanide.

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