分光光度法测定聚烯烃树脂和原油中的铝

Spectrophotometric Determination of Aluminum in Polypropylene Resin and Crude Oil

以铬天青S（CAS）显色剂，采用三元络合物胶束增容分光光度法测定聚烯烃及原油中的微量铝。详细考察了样品的灰化条件和测定条件。在700℃将样品灰化4h以上，通过加入掩蔽剂来掩蔽干扰离子。结果表明，在660nm波长处的线性相关系数为0.9986，摩尔吸光系数为7．93×10^4L／（mol·cm）。铝质量浓度的线性范围为0～0.32mg／L。人工合成样的平均回收率为96．88%。对实际样品进行分析，相对标准偏差为2．04％～3．06％．加标平均回收率为96．73％～98．29％。

Chromazurine S was used as colored indicator chromomeric agent to determine micro aluminum in polypropylene resin and crude oil with complexes micellar spectrophotometer. The measuring conditions and ashing conditions were studied. Through adding masking agent to mask interfering ions, after ,samples was burned to ashes at 700 ℃ for at least 4 h. The results show that the molar absorption coefficient is 7.93 × 10^4 L/（mol·cm） and the linear correlation is 0. 998 6 at 660 nm wave length. The linear range of aluminum mass concentration is 0-0.32 mg/L. The average recovery rate of the artificial synthetic ,sample is 96.88%. The real samples were analyzed. The analytical result of relative standard variation is 2.04 % -3.06 %. The average recovery rate is 96.73 %-98.29%.