黄铁矿中砷的钼兰比色法测定

DETERMINATION OF ARSENIC IN PYRITE BY THE METHOD OF MOLYBDENUM BLUE COLORIMETRY

为排除黄铁矿中砷测定的干扰，解决以往萃取一反萃取劳动强度大、有机试剂污染等问题，经反复试验，采用生成砷化氢与其他干扰元素分离，钼兰比色法测定砷。该方法具有选择性好，测定范围宽，能测定黄铁矿中含量X.00—0．000X％的砷；具有准确度高、操作简单、流程短、减轻劳动强度等优点。

Arsenic can be determined by the method of molybdenum blue colorimetry, instead ofthe method of extraction-antiextraction.The former method has many advantages. It has a good selection with wide range ofdetermination. It has such a high accuracy that the arsenic content of X.00-0. 00X% canbe identified in pyrite. The method is easy to operate and by the less labour intensity- The1atter method has some disadvantages. Its operation needs heavy labour intensity andorganic reagent contaminates enviornment. Therefore, it is the better choice - -molybdenum blue colorimetry.