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|Title:||Determination of mercury in geological samples by cold vapour atomic absorption spectrometric technique|
Babu, S Suresh
|IPC Code:||Int. Cl.7 G01J3/42|
|Abstract:||A method for determination of total mercury in geological samples using acid digestion and subsequent measurement by cold vapour atomic absorption spectrometric technique is described. Sample digestion has been carried out using a combination of hydrochloric and nitric acids followed by reduction of mercury (II) in the extract of its elemental form by stannous chloride. The absorption signal at 253.7 nm has been monitored with a mercury analyzer. The method is simple, cost effective and gives reliable results as indicated by the data obtained on a few international geochemical reference samples, analyzed in this study. Precision of the measurements is within 5% RSD for closed vessel digestion. The detection limit of mercury is found to be 5 ng when 1 ml of 1% sample solution is ulilized. Comparison of data obtained for the same set of standards using both open vessel and closed Savillex pressure decomposition vessel digestions demonstrates enhanced extraction in several cases while using closed vessel digestion. Results indicate that the method can be applied for determination of low levels of mercury in a variety of geological samples for exploration studies.|
|Appears in Collections:||IJC-A Vol.44A(08) [August 2005]|
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