火焰原子吸收光谱法测定铜原尾矿中的铅

Determination of Lead in Copper Original and Tailings by Flame Atomic Absorption Spectrometry

铜原尾矿中硅含量较高,针对这一特性,提出了试样采用饱和氟化氢铵、盐酸、硝酸溶解,在硝酸（5%）介质中,于原子吸收光谱仪上,使用空气-乙炔火焰进行铅的测定,建立了铜原尾矿中铅的测定方法。研究结果表明铅的质量浓度在0.5~3μg/mL范围内与吸光度A有良好的线性关系,方法的相对标准偏差0.92%~2.4%,加标回收率96.0%~106.0%,方法以3倍的空白溶液11次测定值的标准偏差作为检出限,检出限为0.08μg/mL,方法准确、可靠。

The content of silicon in copper original and tailings is generally high. According to this feature, copper original and tailings was digested with saturated ammonium hydrogen fluoride, hydrochloric acid and nitric acid. Lead content in 5 % nitric acid medium was determined by atomic absorption spectrometery with air-acetylene flame. The results showed that a good linear relationship between the lead concentration and absorbance in the range of 0. 5 ~ 3 μg/mL. The relative standard deviation was 0.92 % ~ 2.4 % with 96.0%-106.0% recovery. The detection limit was 0.08 μg/mL, calculated as three times the standard deviation of the blank （k=3, n=11）. The established method is reliable and accurate.