毛细管区带电泳-间接紫外检测法测定饮用水中5种阴离子
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(1.北京市疾病预防控制中心,北京 100013;2.北京市预防医学研究中心,北京 100013)

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王心宇 女 副主任技师 研究方向为卫生理化检验 E-mail:xiruiw133@163.com通信作者:┣┣(中)通信作者┫┫丁晓静 女 主任技师 研究方向为卫生理化检验 E-mail:dxj666@aliyun.com

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北京市卫生系统高层次卫生技术人才培养项目(2013-2-036)


Determination of five anions in drinking water by capillary zone electrophoresis with indirect ultraviolet detection
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(1.Beijing Center for Disease Control and Prevention,Beijing 100013, China;2.Beijing Research Center for Preventive Medicine, Beijing 100013, China)

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    摘要:

    目的 建立毛细管区带电泳-间接紫外检测法测定饮用水中5种阴离子的新方法。方法 样品无需滤膜过滤可直接进样。用未涂覆熔融石英毛细管(75 μm×80 cm,有效长度为70 cm)作为分离柱。以20 mmol/L邻苯二甲酸、100 mmol/L二乙醇胺和0.5 mmol/L十六烷基三甲基溴化铵为分离缓冲体系。结果 Cl-、NO3-、SO42-、F-和H2PO4-这5种阴离子的校正峰面积与质量浓度分别在0.5~100.0、0.2~20.0、0.5~100.0、0.2~4.0和0.2~5.0 mg/L范围内呈线性相关,相关系数分别为0.998 8、0.999 9、0.999 7、0.999 7、0.999 8。检出限均为0.05 mg/L,定量限均为0.15 mg/L,方法精密度均小于5%(n=6)。低、中和高质量浓度加标回收率在81.6%~108.6%之间,相对标准偏差在0.6%~3.7%之间(n=6)。用本法分析了7份饮用水样品,并与离子色谱法的结果相比较,除矿泉水中Cl-结果偏低外,其余基本吻合。结论 本方法简单,所用试剂环保,为饮用水中5种阴离子的常规检测提供了一种新方法,但不适合测定水样中低浓度的Cl-。

    Abstract:

    Objective To develop a new method for the determination of five anions in drinking water by capillary zone electrophoresis with indirect ultraviolet detection. Methods The water samples were directly injected without filtration. The separation was carried out on an uncoated fused-silica capillary (75 μm×80 cm, effective length:70 cm). The separation buffer consisted of 20 mmol/L phthalic acid, 100 mmol/L diethanolamine and 0.5 mmol/L cetyltrimethylammonium bromide. Results The corrected area and the mass concentrations had good linear relationships in the ranges of 0.5-100.0,0.2-20.0,0.5-100.0,0.2-4.0 and 0.2-5.0 mg/L, with correlation coefficients of 0.998 8,0.999 9,0.999 7,0.999 7 and 0.999 8, respectively for Cl-, NO3-, SO42-, F- and H2PO4-. The limit of detection was all 0.05 mg/L and the limit of quantitation was 0.15 mg/L for all of the five anions. The relative standard deviations of the method were all lower than 5%(n=6). The average spiked recoveries at three concentration levels were in the ranges of 81.6%-108.6% with relative standard deviations of 0.6%-3.7% (n=6), respectively. Seven samples were analyzed and the result were compared with those of ion chromatographic (IC)method. They agreed well except that the result of Cl- in mineral water was lower than that of IC determination. Conclusion The method was simple without any consumption of organic solvents. The drinking water sample could be directly injected without filtration. It provided a new alternative method for the routine determination of five anions in drinking water. But it was not suitable for the analysis of drinking water samples with low Cl- concentration.

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王心宇,田佩瑶,王萍,丁晓静.毛细管区带电泳-间接紫外检测法测定饮用水中5种阴离子[J].中国食品卫生杂志,2019,31(1):44-48.

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  • 收稿日期:2018-12-29
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  • 在线发布日期: 2019-03-22
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