【摘要】 使用微波消解仪,在密闭升温增压条件下,以王水浸提重晶石中铅和镉,用火焰原子吸收光谱法测定铅,石墨炉原子吸收光谱法测定镉。浸取率比用同样酸的常压敞开浸提法高,样品空白值低;处理样品的速度比用高压坩埚酸浸提法快;试样中的铅和镉损失比碳酸钠融熔处理法少。方法检出限:铅为0.069μg/mL,镉为0.087μg/mL。样品中铅、镉的加标回收率分别为95.1%～99.5%,97.1%～104.4%;相对标准偏差分别为1.3%～3.2%,1.6%～2.8%。更多还原

【Abstract】 It was found that lead and cadmium in barite can be extracted efficiently with aqua regia un- der the conditions of obturation,heating and pressurization in microwave digestion instrument,and were determined by flame atomic absorption spectrometry and graphite furnace atomic absorption spectrometry respectively.The extraction yield was higher and the sample blank value was lower in this method than in atmospheric extratcion method.The extraction vilocity of the method was faster than that of high pressure vessel method.The loss of lead and cadmium was less than that in sodium carbonate melts method.The recoveries of lead and cadmium found by the standard addition method were between 95.1% to 99.5% and 97.1 to 104.4%,respectively.The RSD for lead and cadmium ranged from 1.3% to 3.2% and 1.6% to 2.8% ,respectively.The detection limit for lead were 0.069μg/mL and 0.087ng/mL for cadmium.更多还原