载炭泡塑吸附-电感耦合等离子体发射光谱法测定金矿石的金量

Determination of Gold in Gold Ores by Inductively Coupled PlasmaOptical Emission Spectrometry with Carbon-loaded Foam Plastic Adsorption

载炭泡塑吸附法对金有良好的吸附性能,但只能用于抽滤吸附不能振荡吸附,分析手续繁杂。本文以载炭泡塑振荡吸附-电感耦合等离子体发射光谱法测定金矿石的金量。样品在650℃高温灼烧2 h,用50%王水和10%氯化铁加热溶解,溶液冷却后加入5%高锰酸钾氧化,用中密度规格的载炭泡塑两次振荡吸附溶液中的金,然后于580℃高温灼烧后以50%王水溶解灰分,直接用ICP-OES测定金量。方法检出限（3σ）为0.002μg/g,精密度（RSD,n=11）小于3.7%。本方法对金的吸附率大于99.9%,测定范围为0.01~90μg/g,对不同类型金矿石的适应性强,解决了以往泡塑吸附法吸附率较低、标准系列与样品需同时预处理的问题,对低含量和高含量样品均有较高的准确度。

The method of carbon-loaded foam plastic adsorption has good adsorption properties of gold,but is only suitable for filtration adsorption with complicated analytical procedures. Inductively Coupled Plasma-Optical Emission Spectrometry（ ICP-OES） with carbon-loaded foam plastic adsorption was used to determine the content of gold in gold ore and is described in this paper. The gold ore sample was firstly burned at 650℃ for 2 h,followed by dissolution with 50% aqua regia and 10% ferric chloride,then oxidated with 5% potassium permanganate. Gold in the solution was adsorbed twice by carbon-loaded foam plastic. The carbon-loaded foam plastic with gold was burned at 580℃ and dissolved in 50% aqua regia,after which the content of gold could be measured by ICP-OES.The detection limit is 0. 002 μg / g and precision（ RSD,n = 11） is less than 3. 7%. The method of gold adsorption rate is greater than 99. 9% and the measured range is 0. 01- 90 μg / g. The method has a strong adaptability to different types of gold ore with higher accuracy for low content and high content of the samples than the previous method.