Inter-laboratory note. Inserted injector tubes for inductively coupled plasma spectrometry

Abstract

Experiments are described in which an inductively coupled plasma is operated with an injector tube that is inserted into the body of the plasma. The system is highly tolerant to pressure fluctuations from the sample introduction system. Both wide (6 mm o.d., 3 mm i.d.) and narrow (2 mm o.d., 1 mm i.d.) injector tubes were studied. Interestingly, the intensities observed with the two different injector tubes were fairly similar. Alumina was found to be a superior material since graphite appeared to reduce the power of the plasma.