title: Investigation of the Matrix Effect on the Accuracy of Quantitative Analysis of Trace Metals in Liquids Using Laser-Induced Breakdown Spectroscopy with Solid Substrates.
abstract: The detection limit of trace metals in liquids has been improved greatly by laser-induced breakdown spectroscopy (LIBS) using solid substrate. A paper substrate and a metallic substrate were used as a solid substrate for the detection of trace metals in aqueous solutions and viscous liquids (lubricating oils) respectively. The matrix effect on quantitative analysis of trace metals in two types of liquids was investigated. For trace metals in aqueous solutions using paper substrate, the calibration curves established for pure solutions and mixed solutions samples presented large variation on both the slope and the intercept for the Cu, Cd, and Cr. The matrix effects among the different elements in mixed solutions were observed. However, good agreement was obtained between the measured and known values in real wastewater. For trace metals in lubricating oils, the matrix effect between the different oils is relatively small and reasonably negligible under the conditions of our experiment. A universal calibration curve can be established for trace metals in different types of oils. The two approaches are verified that it is possible to develop a feasible and sensitive method with accuracy results for rapid detection of trace metals in industrial wastewater and viscous liquids by laser-induced breakdown spectroscopy.
authors.affiliation: School of Sciences, Shandong University of Technology, Zibo, R. P. China xiujunshan@126.com.
authors.forename: Junshan
authors.initials: J
authors.lastname: Xiu
authors.affiliation: School of Chemical Engineering, Shandong University of Technology, Zibo, R. P. China.
authors.forename: Lili
authors.initials: L
authors.lastname: Dong
authors.affiliation: School of Sciences, Shandong University of Technology, Zibo, R. P. China.
authors.forename: Hua
authors.initials: H
authors.lastname: Qin
authors.affiliation: School of Sciences, Shandong University of Technology, Zibo, R. P. China.
authors.forename: Yunyan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, Villeurbanne cedex, France.
authors.forename: Jin
authors.initials: J
authors.lastname: Yu
keywords: LIBS; Laser-induced breakdown spectroscopy; calibration curves; matrix effect; metals in liquids; solid substrate