参加水中氨氮、挥发酚检测能力验证的体会
A Proficiency Test Report of Ammonia and Volatile Phenol in Water
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摘要:
目的 通过参加水中氨氮、挥发酚的检测能力验证,进一步总结经验,提高水质检测水平。 方法 采用《生活饮用水标准检验方法& #183;无机非金属指标》 (GB/T 5750.5-2006)纳氏试剂分光光度法测定氨氮、《生活饮用水标准检验方法& #183;感观现状和物理指标》 (GB/T 5750.4-2006)氨基安替吡啉三氯甲烷萃取分光光度法测定挥发酚。以Z比分值来评价和判定检测结果。 结果 本实验室氨氮测定数据实验室间Z比分值(ZB)为0.35,实验室内Z比分值(ZW)为0.22,挥发酚测定数据ZB值为-1.12, ZW值为0.54,|Z|均≤ 2,二项能力验证结果均为满意。 结论 在本次水中氨氮、挥发酚能力验证活动中,通过采用标准样品进行实验室内部质量控制,严格按方法要求配制试剂和操作,用超纯水仪处理实验用水,控制空白值等关键点,可以获得满意结果。 Abstract:Objective To further improve the water testing capability through a proficiency test of ammonia and volatile phenol in water. Methods The level of ammonia was tested by a Nessler spectrophotometry and the level of phenol was tested by a 4-AAP-chloroform extraction spectrophotometry. Z-score was used to evaluateand predicate test results. Results In the ammonia test, the Z-score of tests among laboratories (ZB)was 0.35 and the Z-score of tests within the same laboratory (ZW)was 0.22; in the phenol test, ZB was -1.12 and ZW was 0.54. It indicated that both tests met the proficiency requirement (both|Z|≤ 2). Conclusion The proficiency tests suggestion couple of key issues in laboratory management, such as internal quality control procedure, reagents' preparation and operation, purified water and blank controls.
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