镓与对乙酰基偶氮羧-m的显色反应及其应用研究  

Study on Colour Reaction Between Gallium and p-acetylcarboxylazo-m and Its Application

作　　者：邢志强[1] 田明[1] 徐倩[1] 李莹[1] 王晓娜[1] 邓桂春[1] 

机构地区：[1]辽宁大学化学院,辽宁沈阳110036

出　　处：《辽宁大学学报（自然科学版）》2008年第4期351-354,共4页Journal of Liaoning University：Natural Sciences Edition

摘　　要：研究了对乙酰基偶氮羧-m与Ga（Ⅲ）的显色反应,建立了分光光度法测定镓的新方法.在pH=2.0的酸性介质中,镓与对乙酰基偶氮羧-m形成1∶2的有色络合物,最大吸收波长位于681 nm,表观摩尔吸光系数6ε81=1.14×10^5L.mol-1.cm^-1,检出限为0.73μg/L,线性范围为1.0～11.0μg/25 mL.方法应用于煤和煤矸石中微量镓的测定,获得了满意的结果.The colour reaction between gallium and p - acetylcarboxylazo - m is studied in this paper. In the acid medium of pH 2.0, p - acetylcarboxylazo - m and gallium form a coloured complex with mole ratio of 1：2. The maximum absorption wavelength is at 681 nm with an apparent molar absorptivity of 1.14×10^5L.mol-1.cm^-1 The detection limit is 0.73μg/L and the linear range is 1.0 ～ 11.0 μg/25 mL of gallium. The method has been applied to the determination of microamount of gallium in coal and shale with satisfactory results.

关 键 词：镓 对乙酰基偶氮羧-m 煤 煤矸石 分光光度法 

分 类 号：O657.3[理学—分析化学]