Abstract
The vapori zation of mercury from nitric acid solutions containing very small amount of mercuric nitrate has been studied by using 203Hg as the tracer. 5 ml of the mercuric nitrate solutions were put in test tubes (5mm in dia. and 150mm in height), covered with Saran Wrap (polyvinylidene chloride synthetic thin film), allowed to stand and the radioactivity measurements were carried out at regular intervals. A remarkable escape of mercury was recognized if the mercury concentration was below 0.1 ppm. The concentration of nitric acid seems to have no effect on the vaporization when it was below 0.6N. On passing air through the very dilute mercuric nitrate solutions, mercury vaporized more rapidly. The vaporized mercury could be collected effectively when the air was then passed through an acid solution of potassium permanganate. No recovery of mercury from the air, however, was observed if the air was passed through a 10 ppm mercuric nitate or water instead of the oxidizing solution. This seems to suggest that the vaporized mercury is in the state of Hg(0).
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