Abstract：The conditions of high pressure microwave digestion in closed vessels are discussed in detail and optimized. Most of chrome ores from main business countries were tested by this method. The results showed that chrome ores could be digested completely under such conditions as: 0.20 g of sample weight, 7 mL of H2SO4, 5 mL of H3PO4, 1 mL of HBF4, high pressure digestion power at 1200 W and digestion time of 40 min. Using this digestion conditions, two national primary reference ores of chromium containing different content of chromium sesquioxide were determined for 10 times by potentiometric titration. The average value of the determination results were consistent with the certified values with a relative error of 0.018 %-0.024 % and relative standard deviation of 0.11％-0.14％. The proposed method has also been applied to the digestion and determination of chromium ores from different countries. The results of chromium sesquioxide were all within the allowable error.
胡德新;马德起;潘宏伟;王振坤;王虹;姚传刚;魏红兵. 电位滴定法测定铬矿石中三氧化二铬的微波溶样法研究[J]. 冶金分析, 2011, 31(2): 63-66.
HU De xin;MA De qi;PAN Hong wei;et al.. Study on microwave dissolution of sample for the determination of chromium sesquioxide in chrome ore by potentiometric titration. , 2011, 31(2): 63-66.
