Abstract
The proportion of methylmercury to the amount of total mercury has been determined in river and lake water samples from the Ottawa Valley in Canada. The results showed that a relatively constant equilibrium between organic and inorganic mercury has been maintained over the last decade in the Ottawa area. A simple method to determine both organic and inorganic mercury in natural waters is described. After the extraction with dithizone-chloroform, inorganic mercury was back extracted to aqueous solution with sodium nitrite, while methylmercury was recovered to the aqueous medium with sodium thiosulfate. Mercury was determined by a two-stage gold amalgamation technique in conjunction with cold vapour atomic absorption spectrometry. Preconcentrating the mercury from 21. samples, the method provided a detection limit of 0.1 ng/l.
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