• 关键词：溶解氧  分析质量控制

• 基金项目：

• 刘德福
• 河北省环境监测中心站

• 摘要：本文提出一种关于水中溶解氧分析质量控制的实验设计,其要点为:每天制备一份20℃饱和溶解氧的蒸馏水作为质控样品,分别用碘量法、叠氮化钠修正法、高锰酸钾修正法进行分析。至少取得20组数据后,绘制多样控制图,每天取已知量的质控样品加入到天然水样中并测定回收率,至少取得20组数据后,绘制准确度控制图,本设计适用于实验室内分析质量控制,并在某种程度上适用于实验室间分析质量控制。

• Abstract：An experimental design for quality contro lof dissolved oxygen analy-sis was proposed. Distilled water saturated with oxygen at 20℃ was prepared as control sample and was analysed by iodometric, azide modification and permanganate modification methods day by day. The quality control charts were constructed based on the data accumulated for 20 days.A reference solution was mixed with the natural water sample and analysed to determine the recovery ratio which was used for an accaracy control chart construction.

• Key words：DO  analysis quality control

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