土壤总铬测定方法的改进

Modification on Method of Determining Total Chromium in Soil

硝酸———硫酸———磷酸消解 ,高锰酸钾氧化 ,二苯碳酰二肼分光光度法检测土壤总铬是土壤总铬检测方法之一。文章在上述方法原理基础上通过实验进一步研究建立新方法。该方法检出限低 0 .0 75 μg ,灵敏度、准确度高 ,精度小于等于 3%。新方法操作更科学 ,降低实验成本、省力、省时、准确。

DPC colorimetric method including digestion with HNO 3,H 2SO 4 and H 3PO 4 and oxidation with KMno 4 is one of the common methods for determining total chromium in soil.A new method is described after experiments and further research on the basis of the principle of the above mentioned way. This method has gained a DL 0.075μg,CV≤3% and the recovery of the known samples 95%-105%.