摘要
在碘量法测定水中溶解氧的基础上,利用I3-与结晶紫在聚乙烯醇存在下结合成电中性的离子缔合物,以碘酸钾为标准溶液,与过量碘化钾反应生成碘,加入结晶紫后在550 nm处有最大吸收的原理测定水中溶解氧,优化了试验条件,考察了共存离子的干扰。方法在0.002 7 mg/L^0.55 mg/L范围内符合比尔定律,检出限为0.001 1 mg/L,蒸馏水平行测定的RSD≤0.2%,加标回收率为100%~101%,实际水样测定与碘量法和溶解氧测定仪结果一致。
The method was established for determining dissolved oxygen in water by IO^-3-I^--crystal violet- PVA spectrophotometry. A ion-association complex （ maximum absorbance at 550 nm） was formed after the reaction of I^-3 and crystal violet to determine DO in water. Test conditions were optimized and interfere of co-exist-ence ions were observed to produce following results： Beer＇s law was obeyed at the DO concentration from 0.0027mg/L to 0.55 mg/L; the detective limits 0.0011mg/L; RSD of distilled water parallel samples 0.2% ; the recoveries of spiked samples from 100% to 101% ; water samples detective results in agreement with those results of Winkler method and dissolved oxygen meter method.
出处
《环境监测管理与技术》
2009年第5期42-45,共4页
The Administration and Technique of Environmental Monitoring
基金
江苏省高校自然科学研究计划基金资助项目(05KJB150003)
江苏省海洋生物技术重点建设实验室基金资助项目(2005HS010)
淮海工学院自然科学研究基金资助项目(Z2007045)
关键词
溶解氧
结晶紫
聚乙烯醇
分光光度法
水质
Dissolved oxygen
Crystal violet
Polyvinyl alcohol
Spectrophotometry
Water quality
