泡沫塑料富集、硫脲解脱-碘量法测定金的应用

Foam Plastic Enrichment,Thiourea ReliefApplication of Iodometry for Gold Measurement

介绍了试样中金的一种快速测定方法。试样以王水分解、泡塑富集分离金，硫脲解脱，以硝酸．硫酸破坏硫脲，用氟化氢胺-EDTA掩蔽铁、铜、铅等干扰元素，加碘化钾使之析出碘，以淀粉为指示剂，用硫代硫酸钠进行滴定。该方法的测定范围为0．5～1000g／t的Au。

This article introduces fast determination of gold from samples. Samples are decomposed by the aqua regia, thiourea extricated by nitric acid-sulfuric acid. Conceal disturbing elements like iron, copper, lead with hydrogen fluoride amine - EDTA, add the potassium iodide to separate iodine, and take starch as indicator, titrate with sodium hyposulfite. Determination scope of this method is 0.5 - 1000g/t Au.