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研究了铋、氧化铋、硫化铋在硝酸-硫脲中的溶解性。三价铋离子与硫脲溶液可形成黄色络合物,在波长为460nm处,反应温度为25℃,反应时间为6min,硝酸浓度为1.0mol/L,硫脲浓度为0.5mol/L,振荡速率为160r/min条件下铋含量在0.059—4.57μg/mL范围内服从郎伯-比尔定律,检出限为m=0.04μg。铋矿物的溶解性顺序大小为Bi2O3>Bi>Bi_2S_3。本方法操作简便,可靠,实验结果满意,具有广泛的实用意义。
The solubility of bismuth, bismuth oxide and bismuth sulfide in nitric acid-thiourea was studied. Trivalent bismuth ion and thiourea solution can form a yellow complex. At the wavelength of 460nm, the reaction temperature is 25 ℃, the reaction time is 6min, the concentration of nitric acid is 1.0mol / L, the concentration of thiourea is 0.5mol / L, Under the condition of 160 r / min, the bismuth content obeys the Lambert-Beer law in the range of 0.059-4.57 μg / mL with the detection limit of m = 0.04 μg. The order of solubility of bismuth minerals is Bi2O3> Bi> Bi2S_3. The method is simple and reliable, the experimental results are satisfactory and has a wide range of practical significance.