玻璃片—分光光度法测定玻璃中铁和亚铁

摘要

利用紫外-可见分光光度计玻璃中三价铁含量与紫外吸收峰面积,二价铁含量与可见及近红外吸收峰面积的对应关系X射线荧光、湿化学—分光光度法和玻璃片—分光光度法相同玻璃中铁含量,玻璃片—分光光度法的准确性.结果显示,玻璃中三价铁含量和二价铁含量分别与单位厚度玻璃片在370～400 nm范围的紫外吸收峰面积和520～1i00 nm范围的可见及近红外吸收峰面积线性相关,可以用相应吸收峰面积计算玻璃中不同价态铁的含量.玻璃片—分光光度法的测试结果与X射线荧光和湿化学—分光光度法的测试结果相对误差均在士5％以内,利用玻璃片—分光光度法可以准确测定玻璃中的铁和亚铁含量.%To investigate a new method of fast determination of iron contents and ferrous iron contents in glasses by sheet glass spectrophotometry,UV-Vis spectrophotometer and wet-chemical spectrophotometry were used to study the relationships between ferric iron content and its UV absorption peak area,and between ferrous iron content and its Vis-NIR absorption peak area in unit thickness sheet glass.By using fluorescent X-ray spectrometry,wet-chemical spectrophotometry and sheet glass spectrophotometry methods on the determination of iron contents in identical glasses,the accuracy of sheet glass spectrophotometry was studied.The results showed that ferric iron contents in glasses have linear correlation with UV absorption peak areas of unit thickness sheet glasses in 370-400 nm region,ferrous iron contents in glasses have linear correlation with Vis-NIR absorption peak areas of unit thickness sheet glasses in 520-1100 nm region,the contents of different charge irons in glasses can be determinated by calculating corresponding absorption peak areas.The relative errors of determination results between sheet glass spectrophotometry and fluorescent X-ray spectrometry,and between sheet glass spectrophotometry and wet-chemical spectrophotometry are both under ± 5 ％,sheet glass spectrophotometry can be used to correctly determinate iron contents and ferrous iron contents in glasses.