石蜡相分光光度法测定粉煤灰中痕量钴  

Determination of trace cobalt in fly ash by paraffin phase spectrophotometry

作　　者：罗道成[1] 刘俊峰[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《冶金分析》2004年第3期35-37,共3页Metallurgical Analysis

摘　　要：研究钴 与 1 ( 2 吡啶偶氮 ) 2 萘酚 (PAN)在石蜡相中的显色反应 ,借此建立了一种测量痕量钴 的新型固相光度法。在pH 10 4的Na2 B4 O7-NaOH缓冲溶液中 ,钴 与PAN反应生成的有色络合物能定量被石蜡萃取 ,钴含量在 0～ 0 3 2mg/L范围内符合比尔定律 ,方法的检出限为 1 11× 10 - 6 g/L。本法已用于粉煤灰中痕量钴的测定 。A spectrophotometric method based on the color reaction of cobalt*' with 1-(2-pyridylazo)-2-naphthol(PAN) in paraffin phase has been developed . In the buffer solution of Na 2B 4O 7-NaOH at pH 10.4,the colored complex of cobalt*' with PAN can be quantitatively extracted into paraffin phase.Beer's law is obeyed in the range of 0-0.32 mg/L for cobalt*',the detection limit of the method is 1.11×10 -6 g/L.The method has been applied to the determination of trace cobalt in fly ash with satisfactory results.

关 键 词：石蜡相分光光度法 测定 粉煤灰 钴 显色反应 固相光度法 火电厂 

分 类 号：O657.31[理学—分析化学]