Jump to main content
Jump to site search


Handheld laser-induced breakdown spectroscopy (LIBS) as a fast and easy method to trace gold

Author affiliations

Abstract

Gold is traded in virtually every country around the world. Consequently, tracing gold provenance is a difficult but necessary task to ensure a responsible supply chain from deposit to consumer. Measuring the silver content is often the first step in characterizing gold to retrace its origin. In this study, laser-induced breakdown spectroscopy (LIBS) using a handheld instrument was evaluated as a fast and easy method to analyse the silver content in natural gold. Six commercial gold alloys and natural gold from French Guiana were used. Our results demonstrate that handheld LIBS is relevant to gold traceability and is simple to use in the field. The micron-scale focused laser beam allows in situ analyses of small gold grains with acceptable reproducibility. Univariate and multivariate regression modelling was performed to assess the best calibration model for quantification of the Ag content. The quadratic univariate model was selected for its good predictive ability, with a coefficient of determination R2 of 0.99 and a mean average error of 0.36 wt% Ag for prediction. The LIBS analyses of natural gold were compared to the EPMA data using a statistical test that allow distinct gold populations to be discriminated (or matched) and the results indicate it would be suitable for identifying unknown samples. We were able to successfully trace the origin of our “unknown” samples, a promising first step in the goal of delivering a low-cost field-based tool for responsible supply chain management.

Graphical abstract: Handheld laser-induced breakdown spectroscopy (LIBS) as a fast and easy method to trace gold

Back to tab navigation

Supplementary files

Article information


Submitted
18 Dec 2019
Accepted
03 Jan 2020
First published
07 Jan 2020

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Technical Note

Handheld laser-induced breakdown spectroscopy (LIBS) as a fast and easy method to trace gold

A. Pochon, A. Desaulty and L. Bailly, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/C9JA00437H

Social activity

Search articles by author

Spotlight

Advertisements