Pencil lead scratches on steel surfaces as a substrate for LIBS analysis of dissolved salts in liquids

Abstract:

A new substrate for the quantitative analysis of salts dissolved in liquids with Laser-induced Breakdown Spectroscopy (LIBS) is introduced for the first time. A steel surface scratched with HB pencil lead is introduced as a very efficient and sensitive substrate for quantitative analysis of dissolved salts in liquids. In this work we demonstrate the analytical quality of this system with the analysis of the crystalline deposits formed by the dried aqueous solutions of salts. We focused on analytical parameters such as sensitivity and linearity for the salt cations in each case. Four salts were studied (Sr(NO 3)2, LiSO4, RbCl and BaCl), at nine different concentrations each. To improve linearity and lower the overall error in the calibration curves, we introduce a novel outlier removal method that takes into account the homogeneity of the dry deposits on the analytical surface.

Año de publicación:

2011

Keywords:

Fuente:

scopus