Abstract
Two special X-ray spectrometers have been developed for the measurement of sulfur pollution. One of them is a portable instrument which uses a 50 W aircooled X-ray tube and a vacuum spectrometer with a NaCl crystal. It can detect 0.5μg/cm 2 of S in 100-s counting interval. The other instrument is specifically for the measurement of valence state of sulfur. It consists of a replacement channel for the multiple-crystal spectrometer instrument used by the Environmental Protection Agency for routine analysis. With this replacement channel details of the sulfur spectrum can be scanned or the crystal may be set for the sulfate Kβ satellite for routine determination of the sulfate fraction of total sulfur.
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