摘要
目的建立能测定不同质量浓度范围水碘样品的测定方法，以适用于不同地区水中碘的检测、方法不同碘质量浓度（0～10、0～100、100～600μg／L）的水样，取样量、砷铈浓度、反应时间以及测量波长是不同的取一定量的水样和标准溶液（低水碘0～10μg／L．水样先经过过硫酸铵消化）．加入亚砷酸溶液于30℃温浴15min，使用秒表计时，依顺序每管间隔15～30s向各管准确加入硫酸铈铵溶液．反应一段时间后．在特定的波长下进行检测，根据吸光度值的对数与含碘量呈线性关系计算水样含碘量：结果不同碘质量浓度范围（0～10、0～100、100～600μg／L）标准曲线的平均相关系数均〉0．9990；精密度在各个质量浓度范围内取高、中、低3个水样重复测定6次，其变异系数（CV）均〈2％：准确度在各个质量浓度范围内对低、中、高3种不同含碘量的水样加碘标平均回收率分别为99．7％、98．8%、99．3％（n=6）。结论检测方法操作简单，结果准确．适宜于不同地区水碘测定。
Objective To establish a method of determining water iodine suitable to measure different ranges of iodine content in water. Methods The volume of water sampled, the concentration of arsenious acid solution and eerie ammonium sulfate solution, the reaction time and the wave length varied according to the range of iodine content in water（0- 10,0- 100,100- 600 μg/L）. Water sampled and standard iodine solution was pipetted into a test tube（low iodine of 0 - 10 μg/L was digested with ammonium persulfate first）, added with a certain volume of arsenious acid solution into each tube, heated at 30℃ for 15 minutes. Ceric ammonium sulfate solution was added into each tube at 15 - 30 second intervals, the absorbance at a given wave length was read. The iodine content was measured according to its lineage correlation with logarithm of absorbance. Results The coefficient of variations （CV） of different range of iodine content（0 - 10, 0 - 100,100 - 600 μg/L） were all below 2% in 6 repeated measurements. The average recoveries were 99.7%, 98.8% and 99.3% of low, moderate and high iodine water sample, respectively. Conclusion This method is suitable to measure iodine in drinking water of different iodine content range, easy to be performed with precision and accuracy.
出处
《中国地方病学杂志》
CAS
CSCD
北大核心
2007年第3期333-336,共4页
Chinese Jouranl of Endemiology
关键词
水
碘
分光光度法
Water
Iodine
Spectrophotometry
