EVALUATION OF AN AXIALLY AND RADIALLY VIEWED INDUCTIVELY-COUPLED PLASMA USING AN ECHELLE SPECTROMETER WITH WAVELENGTH MODULATION AND 2ND-DERIVATIVE DETECTION
Y. Nakamura et al., EVALUATION OF AN AXIALLY AND RADIALLY VIEWED INDUCTIVELY-COUPLED PLASMA USING AN ECHELLE SPECTROMETER WITH WAVELENGTH MODULATION AND 2ND-DERIVATIVE DETECTION, Journal of analytical atomic spectrometry, 9(7), 1994, pp. 751-757
A high-dispersion echelle spectrometer which incorporates wavelength m
odulation and second-derivative signal detection is used to view analy
te emission from an inductively coupled plasma in both the axial (end-
on) and radial (side-on) configurations. Movement of the plasma torch
assembly between the viewing positions is computer controlled. Perform
ance characteristics such as background intensity, repeatability, back
ground equivalent concentration, limit of detection, dynamic range and
interference effects are reported for 24 elements and in general, mea
surement in the end-on position produces an improvement in sensitivity
. Using end-on measurement, the system is applied to the multi-element
analysis of a certified reference water.