铬天青S分光光度法测定水中铝含量

Determination of Aluminium in Water by Chrome Azurol S Spectrophotometry

采用铬天青S作显色剂，抗坏血酸、盐酸羟胺作掩蔽剂，选用乙酸-乙酸钠缓溶液冲体系，用分光光度法比色测定水中铝含量．结果表明，加入铬天青S溶液和溴化十六烷基吡啶溶液的量不同对吸光度有较大影响，显色时间在30～50min内吸光度值都较稳定；加入3．00～5．50mL缓冲溶液时，吸光度值变化平缓；对6份不同水样在不同时间重复测定，精密度和准确度良好，加标回收率为98．25％～103．50％．

This study investigated the aluminium content in water by spectrophotometry using chrome azurol S （CAS） as ehromogeuic reagent, ascorbic acid and hydroxylamine hydroehloride as masking agent, and acetic acid-sodium acetate as buffer system. The absorbance value was determined by spectrophotometric method. The results showed that the amounts of CAS solution and cetyl pyridinium bromide （CBP） solution affected the absorbance values. The absorbance values were relatively stable at the color development time within 30 -50 rain and did not significantly changed as the buffer solution increased from 3 to 5 mL. The good repeatability was obtained for 6 different water samples at different times. The recoveries of 6 different water samples were about 98.25% - 103.50%.