Determination of trace elements in refined gold samples by inductively coupled plasma atomic emission spectrometry

Abstract

This paper presents a method for determination the trace contents of silver, copper, iron, palladium, zinc and platinum in refined gold samples. Simultaneous inductively coupled plasma atomic emission spectrometer with radial torch position and cross flow nebulizer was used for determination. In order to compare the different calibration strategies, two sets of calibration standards were prepared. The first set was based on matrix matched calibration standards and the second was prepared without the addition of matrix material. Detection limits for matrix matching calibrations were higher for some elements than those without matrix matching. In addition, the internal standardization method was applied and experiments indicated that indium was the best option as internal standard. The obtained results for gold sample by matrix matching and matrix free calibrations were compared with the obtained results by standard addition method. The accuracy of the methods was tested performing recovery test. Recoveries for spiked sample were in the range of 90-115 %. The accuracy of the methods was also tested by analysis of certified reference material of high pure goldAuGHP1. The best results were achieved by matrix free calibration and standard addition method using indium as internal standard at wavelength of 230 nm. [Projekat Ministarstva nauke Republike Srbije, br. 34024: Development of Technologies for Recycling of Precious, Rare and Associated Metals from Solid Waste in Serbia to High Purity Products

New Simple and Rapid Spectrophotometric Methods for the Determination of Trace Level Gold(iii) Using 2,2',3,4-Tetrahydroxy-3'-Sulpho-5'-Chlorazobenzene Presence of the Cationic Surfactants

“…Therefore, it is clear that in the arsenal of analysts there must be simple and rapid methods to determine Au(III) in a wide concentration range with the highest possible sensitivity accuracy. Although many modern techniques, such as inductively coupled plasma atomic emission spectrometry (ICP-AES) [2], inductively coupled plasma mass spectrometry (ICP-MS) [3,4], electrothermal atomic absorption spectrophotometry (EAAS) [5,6], graphite furnace atomic absorption spectrophotometry (GFAAS) [7] are available for the determination of silver at trace levels in numerous complex materials.…”

Evaluation of different internal standards for precious metals quantification

“…These interferences are often reported to result in systematic and random errors, which eventually cause loss of accuracy and precision [4]. Research has shown that the most frequently used calibration method, namely direct calibration or 'straight run' in spectrometric analysis is severely affected by these interferences [5]. Different spectrometric methods have been developed in the past few years in an attempt to reduce or correct for these numerous matrix effects in spectrometric analysis.…”