Bismuth-Remaining Cupellation Fire Assay Preconcentration Combined with Inductively Coupled Plasma Mass Spectrometry for the Simultaneous Determination of Ultratrace Au, Pt, Pd, Ru, Rh, and Ir in Geologic Samples. (6th May 2021)

• Record Type: Journal Article
• Authors: Ni, Wenshan; Mao, Xiangju; Yao, Mingxing; Sun, Qiliang; Guo, Xiaorui; Zhang, Hongli; Liu, Lu
• Other Names: Basheer Chanbasha Academic Editor.
• Is Part Of: International journal of analytical chemistry. Volume 2021(2021)
• Publication Date: 2021-05-06
• Subjects: Chemistry, Analytic -- Periodicals; 543.05
• DOI: 10.1155/2021/9960673
• Languages: English
• ISSNs: 1687-8760

Abstract

Abstract : In this work, a novel method of bismuth fire assay (Bi-FA) combined with inductively coupled plasma mass spectrometry (ICP-MS) simultaneous determination of ultratrace gold (Au), platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), and iridium (Ir) in geologic samples was established. Bismuth oxide (Bi2 O3 ) was used as noble metal elements fire assay collector, and Bi-remaining protection cupellation was employed to generate Bi granule. After the Bi granule was microwave-digested by aqua regia (40%, v/v), 197 Au, 195 Pt, 106 Pd, 101 Ru, 103 Rh, and 193 Ir in the sample solution were determined by ICP-MS. Using Bi as cupellation protector, volatile Ru could be collected effectively and without volatilization loss during microwave digestion and decompression. Moreover, the toxicity of Bi was exceptionally low compared to toxic nickel oxide and lead oxide in nickel sulfide/lead fire assay; thus Bi-FA was a green environmental analysis method. The mineral composition and decomposition character of chromite, black shale, and polymetallic ore were investigated, and pretreatment procedures were optimized for such special samples. Besides, the influence of mass spectrum interference of coexisting elements was discussed. Under the optimal conditions, excellent curve fittings of Au, Pt, Pd, Ru, Rh, and Ir were obtained between 0.01 and 100 ng·mL −1, with the correlation coefficients exceeding 0.9995. The detection limits were from 0.002 ng·g −1 to 0.025 ng·g −1 . The developed method was applied to analyze the Chinese Certified Reference Materials (CRMs) and the determined values were in good agreement with the certified values.