巯基棉富集-分光光度法测定铂

Determination of Platinum by Spectrophotometry with Sulfhydryl Fiber Pre-concentration

The 3rd Geological Survey Team, The Bureau of Geological Exploration of Henan Province

摘要: 样品溶解后，加入还原剂氯化亚锡及助吸附剂水合肼，用巯基棉吸附微量铂。吸附物灰化后，灰分用王水溶解，溶液用双十二烷基二硫代乙酰胺（DDO）分光光度法测定铂。方法检出限为0.2 μg/g（10.0 g样品），铂量在0～20 μg/g线性关系较好。方法经国家一级标准物质验证，铂的测定结果与标准值相符，12次测定的相对标准偏差（RSD）小于10%。
- 巯基棉；分离富集；铂；分光光度法
Abstract: A method for the determination of platinum in geological samples by spectrophotometry with sulfhydryl fiber preconcentration was developed. After sample digestion, platinum in the sample solution was adsorbed with sulfhydryl fiber in the presence of stannous chloride （reductant） and hydrazine hydrate (assistant adsorbent). The adsorbent was then ashed and digested with aquae regia. Platinum in the sample solution was determined by spectrophotometry in didodecyldithiooxamide （DDO） system. Detection limit of the method for Pt is 0.2 μg/g with liner range of 0～20 μg/g. The method has been applied to the determination of Pt in National Standard Reference Materials and the results are in agreement with certified values with precision of less than 10%RSD (n=12).
- sulfhydryl