氯代磺酚S吸光度比差测量法测定地表水中痕量铝  

Measurement of Absorbance Ratio Difference Determination of Trace Amount of Aluminum in Surface Water with Chlorosulfophenol S as Color Reagent

作　　者：沈钰琳[1] 叶明良 赵丹华[1] 胡张军[1] 李田[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092 [2]浙江康恩贝制药股份有限公司产业运营部,杭州310052

出　　处：《理化检验（化学分册）》2010年第12期1373-1376,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家"十一五"科技支撑计划(No.2008BAJ08B13)

摘　　要：在pH5.4的乙酸盐缓冲介质中,氯代磺酚S与铝(Ⅲ)反应生成结合比为1比1的配合物,其波峰于649nm,波谷于552nm波长处。分别于649nm及552nm处测得含铝显色液及试剂空白液吸光度,按所给公式计算吸光度比和吸光度比差(△A_r),将此吸光度比差测量法应用于地表水中痕量铝的分光光度法测定。结果表明:铝(Ⅲ)的质量浓度在0.050mg·L^(-1)范围内与△A_r值呈线性关系,其检出限(3s/k)为0.8μg·L^(-1)。用此方法测定了长江水、黄浦江水、太湖水及自来水水样中痕量铝的含量,所得结果与石墨炉原子吸收光谱法测得结果相符,加标回收率在93.0%～107.0%之间。In an acetate buffer medium of pH 5.4,a coordination complex of Al-CSPS with its mole ratio of 1 to 1 was formed by the reaction of Al（Ⅲ） with chlorosulfophenol S（CSPS）,showing its absorption maximum at the wavelength of 649 nm（λ_（649）） and absorption minimum at 552 nm（λ_（552））.Values of absorbances at 649 nm and 552 nm of both the color solutions of Al（Ⅲ） and blank solutions were taken,and values of absorbance ratios and their differences（ΔA_r） were calculated by the formula given.The measurement of absorbance ratio difference was used in the spectrophotometric determination of traces of aluminum in surface water.Linear relationship between values ofΔA_r and mass concentration of Al（Ⅲ） was obtained in the range within 0.050 mg·L^（-1）,with detection limit（3s/k） of 0.8μg·L^（-1）.Samples of surface water taken from Yangtze River,Huangpu River,Taihu lake and tap water,were analyzed by the present method,giving results in consistency with those found by GF-AAS.Values of recovery found by standard addition method were ranged from 93.0%to 107.0%.

关 键 词：吸光度比差测量法 氯代磺酚S 地表水 铝(Ⅲ) 

分 类 号：O657.32[理学—分析化学]