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微量钴的测定,近年来多用偶氮类显色剂光度法。S.Shibata[1]和王金甫[2]报导用3,5-二溴-PADAT测定钴,灵敏乏度较高,表观摩尔吸光系数分别为1.42×10~5和1.16×10~5。童沈阳等[3]研究了T(3-MPy)P与钴的显色反应,ε为1.13×10~5、与此同时,我们采用α、β、γ、δ-四(4-三甲铵苯基)卟啉(简称TAPP)光度法测定钴,较系统地研宄了TAPP与钴(Ⅱ)的显色反应条件、络合物组成及其共存离子的影响等。特别是实验中还发现在乙二胺介质中显色后测定,灵敏度显著提高,摩尔吸光系数ε为2.78×10~5,是已知光度法中测定钴灵敏度最高的一种方法。钴(Ⅱ)在0.—6.0微克/25毫升范围内符合比尔定律,有良好的线性关系。应用本法于茶叶、某些药物等试样中微量钴的测定,所得结果及回收试验较为满意。
Determination of trace cobalt, in recent years more use of azo color reagent spectrophotometry. S.Shibata [1] and Wang Jinfu [2] reported that the sensitivity of cobalt to 3,5-dibromo-PADAT was high and its apparent molar absorptivity was 1.42 × 10-5 and 1.16 × 10-5, respectively. Tong et al [3] studied the color reaction of T (3-MPy) P and cobalt with ε of 1.13 × 10 ~ 5. Meanwhile, we used α, β, γ, Phenyl) porphyrin (referred to as TAPP) spectrophotometric method for the determination of cobalt, more systematically studied the color reaction conditions of TAPP and cobalt (Ⅱ), the complex composition and the impact of its coexistent ions. In particular, the experiment also found that the determination of ethylenediamine in the color after the determination of significant increase in sensitivity, molar extinction coefficient ε 2.78 × 10 ~ 5, known spectrophotometry is the highest sensitivity of a method of cobalt. Cobalt (II) complies with Beer’s law in the range of 0. - 6.0 μg / 25 ml and has a good linear relationship. The application of this method in the determination of trace amounts of cobalt in tea, some drugs and other samples, the results obtained and the recovery test is more satisfactory.