Determination of tin in tin ore by inductively coupled plasma mass spectrometry after fusion with sodium peroxide
MA Long1, FU Dong-lei2, MA Ming1, LI Yan-xiang1, LI Bao-yu1, ZHANG Shu1
1. The Testing Center of Shandong Bureau of China Metallurgical Geology Bureau, Shandong Geological Analysis and Testing Engineering Laboratory, Jinan 250014, China;
2. Qingdao University, Qingdao 266071, China
Tin in tin ore is usually determined by iodometry (reduction of aluminum flake). The operation of this method is relatively tedious and the precision of analytical results is relatively low. Based on the characteristics that tin ores are hardly dissolved in acid but easily dissolved in alkali, the tin ore sample was fused with sodium peroxide in experiments followed by leaching with hydrochloric acid. Then the content of tin in tin ore was determined by inductively coupled plasma mass spectrometry. Experimental conditions were investigated, including the dosage of alkali fluxing agent, the fusion time, the selection of isotope and the working parameters of instrument. The optimal fusion conditions were obtained as follows: the flux was sodium peroxide; the mass ratio of sample and flux was 1∶6; the fusion time was 15min; the leaching solution was 40%HCl. The established analysis method was validated. The limit of detection was 13.87mg/kg. The relative errors in determination of the standard materials were less than 3%. The relative standard deviation (RSD, n=12) was less than 2%. The determination results of standard substance and actual samples could meet the determination requirements of tin content in tin ores.
马龙, 付东磊, 马明, 李艳香, 李宝玉, 张姝. 过氧化钠熔融-电感耦合等离子体质谱法测定锡矿石中锡[J]. 冶金分析, 2020, 40(8): 50-54.
MA Long, FU Dong-lei, MA Ming, LI Yan-xiang, LI Bao-yu, ZHANG Shu. Determination of tin in tin ore by inductively coupled plasma mass spectrometry after fusion with sodium peroxide. , 2020, 40(8): 50-54.
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