In the continuous sample introduction
mode, the detection limit was found to be 0.7 μg L-1, and
repeatability was 1.2% RSD (n ) 11) for a 20 μg L-1
standard. In comparison with other vapor generation
methods, it offers several advantages: First, it is applicable
to both inorganic and organic Hg determination; organic
mercury (thiomersal) can be directly transformed into
volatile Hg species without the need for prior oxidation.
Second, the vapor-generation efficiency is high; the efficiency
(with formic acid as a promoter) is superior to
that of conventional SnCl2-HCl reduction. Third, the
vapor generation is extremely rapid and therefore is easy
to couple with flow injection. The method is sensitive and
simple in operation, requires no auxiliary reagents, and
serves as a useful alternative to conventional vapor
generation for ultra trace Hg determination.
In the continuous sample introductionmode, the detection limit was found to be 0.7 μg L-1, andrepeatability was 1.2% RSD (n ) 11) for a 20 μg L-1standard. In comparison with other vapor generationmethods, it offers several advantages: First, it is applicableto both inorganic and organic Hg determination; organicmercury (thiomersal) can be directly transformed intovolatile Hg species without the need for prior oxidation.Second, the vapor-generation efficiency is high; the efficiency(with formic acid as a promoter) is superior tothat of conventional SnCl2-HCl reduction. Third, thevapor generation is extremely rapid and therefore is easyto couple with flow injection. The method is sensitive andsimple in operation, requires no auxiliary reagents, andserves as a useful alternative to conventional vaporgeneration for ultra trace Hg determination.
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