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目的建立一种新型、快速、微量测定饮用水中锌含量的PAN-OP光度法,并对其效果进行评价。方法以1-(2-吡啶偶氮)-2-萘酚(PAN)为显色剂,以乳化剂[烷基苯酚与环氧乙烷缩合物(OP)]为增溶剂,用成品预制试剂盒代替人工临时配制试剂,通过配套研制的微量自动分析仪测定水中锌含量。结果该方法线性范围为0.05~3.00 mg/L,相关系数(r)为0.999 5,检出限为0.01 mg/L,方法相对标准偏差(RSD)为0.15%~1.23%,加标回收率为97.2%~102.7%,实际水样测定结果与国标检验方法中原子吸收分光光度法比较,经配对t检验,差异无统计学意义(P>0.05)。结论新型快速微量PAN-OP光度法操作简便,结果准确,测定快速,线性范围较宽,试剂及样品用量少,可有效提高检测人员工作效率,适合在村镇集中式供水单位普及使用。
OBJECTIVE To establish a new, rapid and trace method for the determination of zinc in drinking water by PAN-OP spectrophotometry and to evaluate its effect. Methods Using PAN (1- (2-pyridylazo) -2-naphthol (PAN) as color former and emulsifier [alkylphenol and ethylene oxide condensate (OP)] as solubilizers, Box instead of artificial temporary reagent preparation, through the development of trace automatic analyzer Determination of zinc in water. Results The linear range was 0.05-3.00 mg / L, the correlation coefficient (r) was 0.999 5, the detection limit was 0.01 mg / L, the relative standard deviation (RSD) was 0.15% -1.23% 97.2% ~ 102.7%. The results of actual water samples were compared with atomic absorption spectrophotometry of GB method. There was no significant difference (P> 0.05) by paired t test. Conclusion The new rapid micro-PAN-OP spectrophotometry has the advantages of simple and convenient operation, accurate results, fast determination, wide linear range, less reagent and sample dosage, effectively improving the working efficiency of inspectors and being suitable for popularization in centralized water supply units in villages and towns.