碱熔酸浸试样-碘量法测定铜冶炼白烟尘中的铜
乔延雷1,马富超1,祁永芳1,刘世浩2,何惠邦1
1.青海铜业有限责任公司,西宁市 811669; 2.青海西矿同鑫化工有限公司,西宁市 811669
Determination of copper in white dust from copper smelting by alkali fusion acid leaching sample-iodometric method
乔延雷1,马富超1,祁永芳1,刘世浩2,何惠邦1
1. Qinghai Copper Co., Ltd., Xining 811669, China; 2. Qinghai Xikuang Tongxin Chemical Co., Ltd., Xining 811669, China
摘要:建立碱熔酸浸试样-碘量法测定铜冶炼白烟尘中铜的方法。采用氢氧化钾-硝酸钾混合溶剂熔融试样,用盐酸浸取,以溴消除砷、锑等元素的干扰,用碘量法测定铜的含量。对滴定条件及共存元素的干扰和消除进行了验证,从而确定了最佳测定条件。实验最佳条件:4 g氢氧化钾和0.5 g硝酸钾混合溶剂;马弗炉温度650 ℃;样品称样量0.300 0 g;硫代硫酸钠标准溶液浓度0.02 mol/L。采用该实验条件,铜冶炼白烟尘中的铜测定结果相对标准偏差在0.37%~0.83%之间(n=10),样品加标回收率为98.30%~101.40%。该方法分析时间短,测定结果准确可靠,具有良好的精密度,可用于铜冶炼白烟尘中铜的测定。
Abstract:A method of determination of copper in white dust from copper smelting by Alkali fusion acid leaching sample-iodometric method was established. Potassium hydroxide-potassium nitrate mixed solvent was used to melt the sample, hydrochloric acid was used to extract, bromine was used to eliminate the interference of arsenic, antimony and other elements, and the content of copper was determined by iodometry. The titration conditions and the interference and elimination of coexisting elements were verified, and the best determination conditions were determined. The optimum conditions were as follows: 4 g potassium hydroxide and 0.5 g potassium nitrate mixed solvent; muffle furnace temperature 650 ℃; sample weight 0.300 0 g; sodium thiosulfate standard solution concentration 0.02 mol/L. Under the experimental conditions, the relative standard deviation of copper in white dust from copper smelting was between 0.37% and 0.83%(n=10), and the recovery rate of samples was 98.30%-101.40%. The method has the advantages of short analysis time, accurate and reliable results, and good precision. It can be used for the determination of copper in white dust from copper smelting.
关键词:铜冶炼白烟尘;碘量法;碱熔酸浸;铜
Keywords:white dust from copper smelting; iodometry; alkali fusion acid leaching; copper
本文引用格式:
乔延雷,马富超,祁永芳,等.碱熔酸浸试样-碘量法测定铜冶炼白烟尘中的铜[J].化学分析计量,2021,30(1):54. Qiao Yanlei,Ma Fuchao,Qi Yongfang,et al. Determination of copper in white dust from copper smelting by iodometric method[J]. Chemical Analysis and Meterage,2021,30(1):54.
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