Elemental Analysis of Black Salt by Laser-Induced Breakdown Spectroscopy and Inductively Coupled Plasma–Optical Emission Spectroscopy

ABSTRACT

Laser-induced breakdown spectroscopy was used for the analysis of black salt at atmospheric pressure using the second harmonic (532 nm) of a Q-switched Nd:YAG laser with a suitable detection system. Spectra of black salt were obtained from 200 to 720 nm with a resolution of 0.06 nm. Na, K, Mg, Ca, Fe, Si, Sr, Li, and Cl were shown to be present in the sample. The relative abundance of the elements were determined by integrated intensity of the strongest line, integrated intensities of all lines from each element, and calibration-free laser-induced breakdown spectroscopy. The results were compared to measurements by inductively coupled plasma–optical emission spectrometry with good agreement.

KEYWORDS:

• Elemental analysis
• inductively coupled plasma–optical emission spectrometry
• laser-induced breakdown spectroscopy