Determination of trace gold in geological samples combining foam adsorption Inductively Coupled Plasma-Mass Spectrometry with closed water bath dissolution
WU Jing， ZHANG Mingjie， XIONG Yuxiang
Hubei Province Geological Experimental Testing Center， Wuhan 430034
Abstract：Traditionally， samples are usually dissolved by acidic solutions in conical flask on electrical panel heater for trace gold analysis of geological samples. Due to the volatility of acid， large amount of acids are wasted and diffuse to the environment which is quite harmful to people. To reduce the usage of acids and air pollution， closed water bath dissolution method was introduced in the present work. The state’s grade I standard material was dissolved in closed water bath dissolution and then measured in combination of foam adsorption and Inductively Coupled Plasma-Mass Spectrometry with rhenium as internal standard. Results showed that the above method is convenient and fastwith high sensitivity (with the detection limit of 0.069 ng/g). The gold contents measured through this method were consistent with standard value and that through traditional method. Furthermore， reduced impact on the surrounding environment was found， which would help protect health of technicians. These indicated that combination of foam adsorption Inductively Coupled Plasma-Mass Spectrometry with closed water bath dissolution is beneficial to improve the efficiency and safety of trace gold determination， providing reference for application in large-scale analysis.
2017, Vol. 51 
