摘要
碳质板岩属黑色岩系,与多种金属(包括贵金属)成矿有密切的联系。按照常规的分析方法,硫镍试金溶剂配方都不能对贵金属元素有较好的富集,影响贵金属元素的测定。根据石墨岩中样品的成份特征,对测定铂族元素的常规硫镍试金配方进行了改进,增加了硝酸钾和氧化镁,且无需加入锇稀释剂。通过实验选择了合适比例配料,熔融后粉碎镍扣,加入盐酸分解,碲共沉淀剂富集。过滤沉淀用王水溶解。用电感耦合等离子体质谱(ICP-MS)法测定,Lu作内标,对碳质板样品中的铂族元素进行了测定。结果表明,加标回收率为85%～105%,能够满足碳质板岩中铂族元素的分析测定要求。
Graphite rock belongs to the black rock series, and has a close contact of mineralization with a variety of metals (including precious metals). According to conventional analysis methods, sulfur, nickel assay solvent formula can not have better enrichment of precious metal elements and interfere the determination of precious metal elements. In this paper, according to the composition characteristics of graphite in the rock samples, the conventional sulfur nickel formula for determination of platinum group elements was improved, increased potassium nitrate and magnesium oxide, and the osmium diluent was not need. Through the experiment,the appropriate proportion of ingredients was selected, nickel buckles were crushed after melting, the hydrochloric acid was added to decompose, telluriumprecipitant agent was enriched. The filtered precipitate was dissolved in aqua regia.The platinum group elements in graphite rock samples were determined by ICP-MS with Lu as internal standard. The result shows that recovery is between 85% and 105%, which can meet the requirements for measurement of platinum group elements in graphite rock.
作者
杨生鸿
张明
辛连君
YANG Shenghong;ZHANG Ming;XIN Lianjun(Qinghai Key Lab for Hydro-geological and Territorial Heat,Xining,Qinghai 810008,China;Qinghai Hydro-geological Engineering Geological Investigation Institute,Xining,Qinghai 810008,China;Qinghai Province Geological and Mineral Testing and Application Center, Xining,Qinghai 810008, China)
出处
《中国无机分析化学》
CAS
2019年第2期42-45,共4页
Chinese Journal of Inorganic Analytical Chemistry
基金
青海省地质矿产勘察开发局青地矿地([2015]19号)
关键词
碳质板岩
硫镍试金
铂族元素
电感耦合等离子体质谱仪
graphite rock
sulfur nickel assay
platinum family element
inductively coupled plasma mass spectrometer
