黑色岩中含有大量有机碳，贵金属元素又呈超微细分散状态，难以识别，传统的镍锍试金方法难于测定。以锡作捕集剂，通过调整试金配料，提高熔融温度，增加助熔剂和覆盖剂等方式，建立了锡试金富集—ICP-MS法同时测定黑色岩中8个贵金属元素的方法。方法检出限(ng/g)为：Ag 27.8，Au、Pd 0.11，Pt 0.10，Rh、Ru、Ir、Os均为0.02；各元素的回收率为88%~120%，可用于黑色岩系及其它岩石矿物中贵金属元素的测定。
The precious metal elements are difficult both to be identified and to be determined by conventional nickel sulphide fire-assay because the black rock contains large amounts of organic carbon and these elements are existed as ultrafine dispersion. A method to determine eight precious metal elements simultaneously by ICP-MS after enrichment with tin fire-assay was reported. Tin was used as the scavenger. The assay ingredients were adjusted to elevate the melting temperature. The flux and covering agent were added. Based on the determination results, the detection limits (ng/g) were 27.8 for Ag, 0.11 for Au and Pd, 0.10 for Pt, and 0.02 for Rh, Ru, Ir and Os. The recovery rate ranged 88%~120%. It can be applied to the determination of precious metal elements in black rock and other minerals samples.
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