摘要
目的建立连续流动分析法测定生活用水中磷酸盐,验证该方法的适用性。方法2020年7月分别将磷酸盐标准系列溶液、标准样品和采集的生活用水加入处于最佳测定条件的连续流动分析仪中,在硫酸载液酸性环境中,分别在显色剂和还原剂的作用下生成蓝色络合物,于流动检测池860 nm进行光度检测。结果在连续流动分析仪最佳分析条件下,磷酸盐的检出限为0.02 mg/L;在0.05~2.00 mg/L浓度范围内的线性关系良好,r=0.999;测定磷酸盐标准溶液RSD为2.2%~6.1%;测定标准品的结果为(1.20±0.04)mg/L,在保证值范围内。本法与GB/T 5750.5—2006《生活饮用水标准检验方法无机非金属指标》中的磷钼蓝分光光度法在磷酸盐检出值相比,差异无统计学意义(P>0.05)。连续流动分析法测定实际水样,结果表明,出厂水、末梢水、二次供水和浅井水中磷酸盐含量较低,水源水中磷酸盐含量较高。结论本法测定磷酸盐的灵敏度高,精密度、准确度好,且具有仪器自动化高、检测快速、环境友好等优势,适合实际应用推广。
Objective To develop a continuous flow analyzer method for determination of phosphate in domestic water,verify the applicability of the method.Methods In July 2020,a series of phosphate standard solutions,standard sample and practical samples were injected into the continuous flow analyzer which was at optimum conditions.In the sulfuric acid carrier liquid ambient,a blue complex produced after samples reacting with color agent and reducing agent in sequence.The absorbance of the complex was detected at wavelength of 860 nm in flow detection cell.Results At optimum analysis conditions of continuous flow analyzer,the detection limit of phosphate was 0.02 mg/L.There was a perfect linear regression within the concentration range of0.05-2.00 mg/L,r=0.999.The RSD of phosphate standard solution was 2.2%-6.1%.The test result of certified reference material was(1.20±0.04)mg/L,which was in the permission range.There was no significant difference in the phosphate detection value between this method and phosphomolybdenum blue spectrophotometric method in GB/T 5750.5-2006 Standard examination methods for drinking water nonmetal parameters(P>0.05).The results of practical water samples by the continuous flow analyzer showed that the content of phosphate were low in finished water,supply tap water,secondary water and shallow water,but it was high in source water.Conclusion The method has high selectivity,good precision and accuracy in detecting phosphate,and it has advantages of high automation,rapid detection and environmentally friendly,which is suitable for practical application and widely popularization.
作者
秦园
钱志荣
吴梅
吴建兵
陈祝军
QIN Yuan;QIAN Zhi-rong;WU Mei;WU Jian-bing;CHEN Zhu-jun(Physical and Chemical Laboratory,Zhangjiagang Centre for Diseases Control and Prevention,Zhangjiagang Jiangsu,215600,China)
出处
《职业与健康》
CAS
2022年第11期1465-1468,共4页
Occupation and Health
基金
张家港市科技支撑计划(社会发展)(ZKS1921)
张家港市青年科技项目(ZJGQNKJ202121)。
关键词
连续流动分析法
磷酸盐
方法对比
生活饮用水
Continuous flow analyzer
Phosphate
Methods comparison
Domestic water
