摘要
当金锡合金中锡含量超过35%,直接进行灰吹时,金、银合粒松散,不聚珠,灰皿中存在灰吹残留渣,导致火试金测定结果偏低。对高含量样品,研究采用熔炼-灰吹的操作可去除锡干扰,得到完整的合粒。对不同含量的样品宜选择不同的分金硝酸浓度。根据不同含量采用不同的操作步骤,测定金锡合金中金的加标回收率为99.74%~100.27%,方法精密度(RSD)为0.021%~0.127%。
When the content of tin in the gold tin alloy is more than 35%,the gold and silver grains are loose and not agglomerated,and there is residual slag in the ash dish,which results in the low result of fire assay.For high content samples,the operation of smelting soot blowing can remove the interference of tin.The complete zygote was obtained.Different concentration of gold and nitric acid should be selected for different samples.Different operation steps were adopted according to different samples.The recovery of gold in gold tin alloy was 99.74%~100.27%,and the precision of the method(RSD)was 0.021%~0.127%.
作者
曾荷峰
金娅秋
甘建壮
鲁瑞智
付仕梅
杨辉
杨梅英
钱彦林
ZENG Hefeng;JIN Yaqiu;GAN Jianzhuang;LU Ruizhi;FU Shimei;YANG Hui;YANG Meiying;QIAN Yanlin(State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Sino-Platinum Metals Co.Ltd.,Guiyan Detection Technology(Yunnan)Co.Ltd.,Kunming 650106,China)
出处
《贵金属》
CAS
CSCD
北大核心
2019年第S01期130-133,共4页
Precious Metals
关键词
分析化学
火试金
金锡合金
含锡量
熔炼-灰吹
分金
analytic chemistry
fire assay
Au-Sn alloy
Sn content
melt-blowing in ash
gold partition