连续流动分析技术测定水中阴离子合成洗涤剂方法优化  

Optimization of Continuous Flow Analysis Technology for Determination of Anionic Synthetic Detergent in Water

作　　者：金艳丹 王占辉[1,2] 薛慧 刘康[3] 姚梦楠 吕亚倩 张开天 JIN Yandan;WANG Zhanhui;XUE Hui;LIU Kang;YAO Mengnan;LYU Yaqian;ZHANG Kaitian(Chengde Center for Disease Control and Prevention,Chengde,Hebei 067000,China;Hebei Provincial Innovation Center for Drinking Water Safety Testing Technology,Chengde,Hebei 067000,China;Beijing Haiguang Instrument Co.,Ltd.,Beijing 101312)

机构地区：[1]承德市疾病预防控制中心,河北承德067000 [2]河北省生活饮用水安全检测技术创新中心,河北承德067000 [3]北京海光仪器有限公司,北京101312

出　　处：《中国无机分析化学》2024年第5期547-552,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家可持续发展议程创新示范区专项科技计划项目(202205B007)。

摘　　要：阴离子合成洗涤剂是洗涤用品的主要成分,属于生物难降解的物质,是当前环境水污染的重要指标,具有较好的去污能力且价格低,广泛应用于餐饮界和工业的消毒,该类物质虽毒性低但降解缓慢,同时还抑制其他有毒物质的降解。为了建立基于连续流动分析检测技术的阴离子合成洗涤剂检测方法,对国家标准方法(GB/T 5750.4—2023)连续流动法中的仪器流路进行调整,将酸性亚甲基蓝流路变为碱性亚甲基蓝流路直接进样,优化亚甲基蓝体系配比,蠕动泵方向为反转且泵的转速为12 r/min,注射时间为40 s,管路清洗时间为300 s,积分时间设置为30 ms,于650 nm波长下进行测量,参比波长为490 nm,以阴离子合成洗涤剂浓度值为横坐标,峰高信号值为纵坐标,制作标准曲线,并对方法的线性范围、检出限、精密度、准确度进行验证,在0~0.35 mg/L,阴离子合成洗涤剂的标准曲线方程为y=0.1243 x-0.0012,且相关系数r值为0.9995,检出限为0.003 mg/L,添加回收率98.4%~103%,精密度在0.74%~1.8%。结果表明,方法线性关系良好,精密度和准确度高,操作简单,污染少,适用于生活饮用水中阴离子合成洗涤剂的大批量分析检测。Anionic synthetic detergent is the main component of detergent,and it is a kind of substance difficult to be degraded,and is an important index of environmental water pollution at present.It has good decontamination ability and low price,and are widely used in the food and beverage industry and industrial disinfection.Although such substance has low toxicity but its degradation is slow,and it also inhibit the degradation of other toxic substances.In order to establish the detection method of anionic synthetic detergent based on the continuous flow analysis,the instrument flow path of the continuous flow method in GB/T 5750.4—2023 was adjusted.The flow path of acid methylene blue was changed into that of basic methylene blue by direct injection,the proportion of methylene blue system was optimized.The direction of peristaltic pump was reversed and the pump speed was 12 r/min.The injection time was 40 s,the pipeline cleaning time was 300 s,and the integral time was set to 30 ms,the reference wavelength was 490 nm.Taking the concentration of anionic synthetic detergent as the horizontal coordinate,the peak height signal value as the vertical coordinate to make the standard curve.The linear range,detection limit,precision and accuracy of the method were also verified.In the concentration range of 0—0.35 mg/L,the standard curve equation of the method was y=0.1243 x-0.0012,the r value was 0.9995,the detection limit was 0.003 mg/L,the recovery was 98.4%—103%,and the precision was 0.74%—1.8%.The results showed that the method has good linearity,high precision and accuracy,simple operation and less pollution.It is suitable for large-scale analysis of anionic synthetic detergent in drinking water.

关 键 词：阴离子合成洗涤剂 连续流动法 亚甲基蓝体系 

分 类 号：O657.32[理学—分析化学]