饮用水中铝含量的检测及氟离子的干扰与消除  

Spectrophotometry method for determination of aluminum and the interference and elimination method of fluorine in drinking water

作　　者：张加玲[1] 刘海芳[1] 李红毅[1] 

机构地区：[1]山西医科大学公共卫生学院卫生化学教研室,太原030001

出　　处：《中国卫生检验杂志》2005年第4期400-401,共2页Chinese Journal of Health Laboratory Technology

基　　金：山西省自然科学基金资助项目(20041108 )

摘　　要：目的:应用分光光度法测定饮用水中铝含量,并对F-离子的干扰及其消除方法进行研究。方法:以铬天青S(CAS)为显色剂、十六烷基三甲基溴化铵(CTAB)为增敏剂,加入硝酸镧作为掩蔽剂使其与水中F-结合,在λ=610nm测定吸光度。结果:铝浓度在0 .5~5 .0μg/25ml范围内与吸光度有很好的线性关系,回归方程Y=0 .163X+0 .045,相关系数r=0 .999。结论:该方法消除了F-离子的干扰,提高了测定准确度。Objective:To determine the trace aluminum and study the interference and elimination method of F^- ion in drinking water by spectrophotometry.Methods:Cetyl trimethylammonium bromide as a sensitivity promoter of color reaction of chromium azure S with aluminum was selected.F^- reacted with La^(3+) when La(NO_3)_3 was added as a masking agent.λ_(max)=(610 nm).Results: A better line relationship curve was obtained over the range of 0.5^(5.0 μg)/(25 ml) Al^(3+).The regressive equation was calculated as Y=0.163X+0.045,(r=0.999).ConclusionThe interference of F^- was eliminated and the accuracy of the results was improved.

关 键 词：铝含量 饮用水 干扰 十六烷基三甲基溴化铵 氟离子 检测 分光光度法 测定准确度 消除方法 线性关系 回归方程 相关系数 吸光度 显色剂 铬天青 增敏剂 掩蔽剂 硝酸镧 铝浓度 

分 类 号：R155.5[医药卫生—营养与食品卫生学] R123.1[医药卫生—公共卫生与预防医学]