二氮杂菲分光光度法分析温泉水中铁的价态

Valence State Analysis of Iron in Hot Spring Water by Phenanthroline Spectrophotometry

使用UV–2100型分光光度计，在二氮杂菲质量浓度为1 g／L、乙酸铵缓冲溶液（pH 4.2）用量为10 mL、显色时间为15 min的条件下，于510 nm处对温泉水中铁的价态进行分析。Fe（Ⅱ）测定结果的相对标准偏差为1.61%（n=20），被测温泉水中总铁加标回收率为98.42%～104.36%，Fe（Ⅱ）的加标回收率为95.25%～102.88%。该法可用于温泉水中铁的价态分析。

UV–2100 spectrophotometer was used to determine iron valence state in hot spring at 510 nm,under the conditions of 1 g/L naphthisodiazine solution, 10 mL ammonium acetate buffer solution （pH 4.2）, and developing time of 15 min. The RSD of Fe（Ⅱ） was 1.61% （n=20）, the recovery rate of total iron was 98.42%–104.36% and the recovery rate of Fe（Ⅱ） was 95.25%–102.88%. This method can be applied to analysis the iron state in the hot spring.