辣椒中微量钼的分光光度法测定——土壤植物中微量元素分析之一

Analysis of Micro Eiements in PJant(i)——Spectrophotometric determination of Micro-Molybdenum in Chilli

植物中钼含量仅占0.1～10ppm,但却是植物生长的必需微量元素。本文用苯基萤尤酮一吐温80-vc显色体系,研究了测定钼的最佳条件,解决了Fe(Ⅲ)的干扰问题。实验结果表明,本方法的灵敏度和重现性比KSCN光度法好,且不必萃取分离,就可准确测定植物中0.1～10ppm范围的钼。在这个体系中用标准加入法测定湖南辣椒中的微量钼的相对于标准误差为3.4％,而回收率在92—103％之内。

Molybdenum is indispensable to plant-growth, although its content in plant is only 0.1-10 ppm. This paper studies the best conditions of determining molybdenum in plant with Phenylf'luorone-Tween 8o-Vitamin C systems and a key problem of the interference of Fe(Ⅲ) has been solved. Experimental results show that sensitivity and reproducibility of this method are better than that of KSCN-spectrophotometric method, and Molybdenum in plants at o.l-10 ppm range can be accurately determined without extraction and separation. Micro-molybdenum in Hunan-Chilli has been determined by the standard addition method in this system, and the relative standard deviation is 3.4% and the rate of recovery is 92-103%.