摘要
报道了用低压离子色谱分离Cr(Ⅵ),Cr(Ⅵ)与K4Fe(CN)6反应生成K3Fe(CN)6再与Luminol化学发光偶合检测Cr(Ⅵ).荧光素对此化学发光反应有增敏作用.优化条件下,Cr(Ⅵ)浓度与化学发光强度在6·0×10-9-2·8×10-7g·mL-1范围内成正比(r=0·9964).选定Cr(Ⅵ)浓度为1·6×10-7g·mL-1,进行5次平行测定,相对标准偏差为1·24%.检出限(3σ)2·0×10-9g·mL-1,检测灵敏度与二苯碳酰二肼光度法相当.用于江水中Cr(Ⅵ)测定与标准方法无显著差异.
A method for determining Cr(Ⅵ) is reported. Cr(Ⅵ ) is separated by low pressure ion chromatography, and then reacts with K4Fe(CN)6. The product K3Fe(CN)6 can react with luminol to produce chemiluminescence, which is greatly ,sensitized by fluorescein. The linear range is 6. 0× 10^-9 --2. 8× 10^-7 g · mL^-1 (r= 0. 996 4), with a detection limit of 2. 0× 10^-9 g · mL^-1 (3σ), and RSD is 1. 24% by measuring 1. 6 × 10^-7 g · mL^-1 Cr(Ⅵ) for five times, This method is applied to determination of Cr(Ⅵ ) in river, and agrees well with standard method.
出处
《西南师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2006年第4期86-89,共4页
Journal of Southwest China Normal University(Natural Science Edition)
基金
重庆市自然科学基金资助(CSTC2004BB7087).
关键词
六价铬
低爪离子色谱
化学发光
荧光素
Cr(Ⅵ)
low pressure ion chromatography(LPIC)
chemiluminescence
fluorescein
作者简介
沈祥(1980-),男,重庆人,硕士研究生,主要从事色谱分离与化学发光连用研究.
通讯作者:周光明,教授.