Determination of Au and Ag in Geological Samples by Loaded Polyurethane Foam-Inductively Coupled Plasma-Mass Spectrometry
10.11895/j.issn.0253-3820.150382
- VernacularTitle:负载泡塑富集-电感耦合等离子体质谱法测定地质样品中痕量金和银
- Author:
Xianglei LIU
;
Wenjun SUN
;
Tianyao WEN
;
Tengfei WANG
;
Weizhi SUN
;
Yongxin LI
;
Jing GUO
- Publication Type:Journal Article
- Keywords:
Loaded polyurethane foam;
Geochemical samples;
Golden;
Silver;
Enrichment;
Inductively coupled plasma-mass spectrometry
- From:
Chinese Journal of Analytical Chemistry
2015;(9):1371-1376
- CountryChina
- Language:Chinese
-
Abstract:
The relatively high abundance of geochemical elements such as Nb, Zr, Y and other elements shows serious interferences in the determination of trace silver in geochemical samples by inductively coupled plasma-mass spectrometry ( ICP-MS) . Thus it will lead to large deviation in the determination of geochemical samples without separation and enrichment. The traditional emission spectrum or graphite furnace atomic absorption method is only single-element analysis to the silver and with bad sample representativeness. In this study, load diphenylthiourea ( DPTU) foam selective enrichment was used for the separation of Au and Ag from other interfering elements in geological samples, and thiourea liberation-ICP-MS method was developed for the simultaneous determination of Au and Ag. The samples were first decomposed by 1:1 aqua regia. After addition of 50 mL of water, the samples were adsorbed under oscillation for 30 min at 20℃. The detection limits of the Au and Ag were 0. 02 ng/g and 0. 007μg/g, respectively. The proposed method was successfully applied to the determination of Au and Ag in eight national standard materials.
