TY - JOUR KW - Gas KW - USA KW - Emission KW - Power KW - Plasma diagnostics KW - Diagnostics KW - Ions KW - Ablation KW - Laser KW - Laser ablation KW - Laser ablation KW - Spectroscopy KW - Intensities KW - Intensity KW - Time KW - Ion KW - Ca KW - E KW - Element KW - Inductively coupled plasma (icp) KW - Inductively-coupled plasma KW - Matrix KW - Nebulization KW - Plasma KW - Sample KW - Spectrometry KW - Emission spectroscopy KW - Emission spectroscopy KW - Icp KW - Line KW - Ratio KW - Science KW - C KW - England KW - Mechanism KW - Matrix effects KW - Argon KW - Argon plasma KW - Calcium KW - Carrier gas KW - Charge-exchange KW - Easily ionizable elements KW - Elements KW - Emission spectrometry KW - Emission spectrometry KW - Excitation KW - Ga KW - Helium KW - Interference KW - Interference mechanism KW - Interferences KW - Ionization KW - Lecture KW - Line-intensities KW - Magnesium KW - Matrices KW - Matrix effect KW - Mixed-gas plasma KW - Mixture KW - Ratios KW - Sample introduction KW - Solution KW - Solution nebulization KW - Zinc AU - George C.Y Chan AU - Wing-Tat Chan AU - Xianglei Mao AU - Richard E Russo AB -

Plasma-related non-spectroscopic matrix effects of 31 elements in inductively coupled plasma (ICP)-atomic emission spectrometry were investigated using both laser ablation and solution nebulization as sample introduction techniques. Matrix effects were studied by monitoring the excitation conditions of the plasma using the ionic to atomic spectral line intensity ratios of zinc and magnesium. A new kind of matrix interference was found in the ICP that appears to be related to matrices with elements of low second ionization potential. The matrix effects do not correlate with the first ionization potential of the element. Only those matrix elements with low second ionization potential showed severe matrix effects. Increasing the forward power of the ICP or replacing the carrier gas with a 50%/50% argon-helium mixture did not significantly reduce this matrix effect. However, using 100% helium as the carrier gas greatly reduced the extent of this matrix effect, suggesting that argon is involved in the interference mechanism. The interference mechanism may involve interactions between doubly-charged matrix ions and argon species. (C) 2001 Elsevier Science B.V. All rights reserved

AD -

Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China

AN - 130 BT - Spectrochimica Acta Part B-Atomic Spectroscopy C2 - LBNL-47088 LA - eng LB - Laser N1 -

LBNL-47088 NOT IN FILE

N2 -

Plasma-related non-spectroscopic matrix effects of 31 elements in inductively coupled plasma (ICP)-atomic emission spectrometry were investigated using both laser ablation and solution nebulization as sample introduction techniques. Matrix effects were studied by monitoring the excitation conditions of the plasma using the ionic to atomic spectral line intensity ratios of zinc and magnesium. A new kind of matrix interference was found in the ICP that appears to be related to matrices with elements of low second ionization potential. The matrix effects do not correlate with the first ionization potential of the element. Only those matrix elements with low second ionization potential showed severe matrix effects. Increasing the forward power of the ICP or replacing the carrier gas with a 50%/50% argon-helium mixture did not significantly reduce this matrix effect. However, using 100% helium as the carrier gas greatly reduced the extent of this matrix effect, suggesting that argon is involved in the interference mechanism. The interference mechanism may involve interactions between doubly-charged matrix ions and argon species. (C) 2001 Elsevier Science B.V. All rights reserved

PY - 2001 SP - 77 EP - 92 T2 - Spectrochimica Acta Part B-Atomic Spectroscopy TI - Investigation of matrix effects in inductively coupled plasma-atomic emission spectroscopy using laser ablation and solution nebulization - effect of second ionization potential VL - 56 ER -