Abstract
Instrumentation, for the cold-vapor atomic absorption determination of mercury has been improved by several modifications including an a.c.—d.c. switching circuit; a single module for the light source, beam splitter, and reference PMT; and the use of an electrically heated glass tube to vaporize water mist, in place of the conventional magnesium perchlorate drying tube. Its use to study the effectiveness of nine common oxidizing agents as preservatives for sub-p.p.b. concentrations of mercury(II) in distilled water has shown that only combinations of nitric acid with potassium dichromate or gold(III) are suitable.
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