Determination of metals in airborne particles by electrothermal vaporization inductively coupled plasma mass spectrometry after accumulation by electrostatic precipitation
1997
A method to determine metals in airborne particles by electrothermal
vaporization ICP-MS after sampling by electrostatic precipitation into a
graphite tube is described. A mobile sampler was used to collect samples.
Calibration was performed with dried aerosol produced by the nebulization
of a standard solution. For Cr, Fe, Mn, Cu, Zn, Sr, Cd, Sb, Ba and Pb, the
absolute detection limits were in the picogram range. The high sensitivity
allowed the monitoring of several metals in ambient air with a time
resolution of hours. The precision was 10–15%. The addition of 5
µg g
-1
of Na (as NaNO
3
) to the standard
solutions improved the signal intensities and reduced the curvature of the
calibration curves. The influence of CHF
3
was investigated but
subsequently abandoned owing to a general increase not only of the signals
but also of the background.
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