Matrix effect on emission/current correlated analysis in laser-induced breakdown spectroscopy of liquid droplets
Resource
Spectrochimica Acta Part B: Atomic Spectroscopy 59 (3): 321-326
Journal
Spectrochimica Acta - Part B Atomic Spectroscopy
Journal Volume
59
Journal Issue
3
Pages
321-326
Date Issued
2004
Author(s)
Huang, J.-S.
Ke, C.-B.
KING-CHUEN LIN
Abstract
We have investigated influence of matrix salts on the liquid droplets by laser-induced breakdown spectroscopy (LIBS). An electrospray ionization technique coupled with LIBS is employed to generate the microdroplets of the Na sample solution with various matrix salts added. A sequence of single-shot time-resolved LIB emission signals is detected. The LIB signal intensity integrated within a gate linearly correlates with the plasma-induced current response obtained simultaneously on a single-shot basis. The slopes thus obtained increase with the sample concentration, but appear to be irrespective of different matrix salts, added up to a 2000 mg/l concentration. The matrix salts involved have the same K+ cation but different anions. Given a laser radiation emitting at 355 nm with the energy fixed at 23±1 mJ, a limit of detection (LOD) of 1.0 mg/l may be achieved for the Na analysis. The current normalization might have probably taken into account the ablated amount of the sample and the plasma temperature. Accordingly, the LIB/current correlated analysis becomes efficient to suppress the signal fluctuation, improve the LOD determination, and concurrently correct the matrix effect. © 2003 Elsevier B.V. All rights reserved.
SDGs
Type
journal article