Effect of pressure of laser-induced plasma spectroscopy for zinc element identification in multivitamin

Abstract

Abstract Identification of zinc elements in 99.9% pure zinc metal and zinc multivitamin tablet samples has been done using Laser Induced Plasma Spectroscopy (LIBS) method. Plasma is generating by laser firing Nd: YAG (1064 nm, 50 mJ, 7 ns). Optimization of laser plasma was performed by varying environmental air pressure and on the spectrum of zinc. The character of samples is displayed in the spectrum line. Spectrum line of 99.9% pure zinc metal shows neutral zinc (Zn I) emission at wavelengths of 280.08, 330.25, 334.50, 472.21, 481.05 and 636.23 nm, and ionic zinc (Zn II) emission of 99.9% pure zinc metal at wavelengths of 250.19 and 255.79 nm. Zinc multivitamin tablet spectrum line shows Zn I emission at the wavelengths as same as 99.9% pure zinc metal of 334.50 and 481.05 nm, which is the intensities of Zn I at a wavelength of 334.50 and 481.05 nm in zinc multivitamin tablet is much higher than in the 99.9% pure zinc metal. The higher the given environmental air pressure, the higher the intensity of the zinc emission spectrum accompanied by high background emission intensity.