摘要
以水溶性α.β.γ.δ—四—(4—三甲铵苯基)卟啉[T-(4-TAP)P]作显色剂,测定了食品中的痕量铜。对实验条件及共存离子的干扰进行了探讨。在乙醇介质及强酸条件下测定时,其选择性及灵敏度均有显著提高。摩尔吸收系数为4.5×10~5 1mol^(-1).cm^(-1)最小检验量为:0.14ng/cm^2,回收率为96.2~106%,变异系数为:0.46~3.6%。操作简便,结果满意。
A new soluble porphyria T-(4-TAP)P was used as spectrophotometric reagent for determination of ultramicro amount of copper in food, The experimental conditions and interference of 15 kinds of ions were studied. The-specificity and sensitivity were both increassed in. alcoholic media and strong acid solution. E=4.5×10~5 1.mol^(-1)·ocm^(-l). The detection limit was 0.14ng/cm^2, the recovery was 96.2-106%, and the coefficient of variation was 0.46-3.6%. The procedure was simple and the results were satisfactory.
关键词
食品检测
痕量
铜
卟啉化合物
Absorption spectra, Calibration curve
Vecoveray, Sensitivity