|Abstract:||An analytical method using cold vapor?
atomic fluorescence spectrometry was
developed by the U.S. Geological Survey in
2001 for the determination of organic plus
inorganic mercury in filtered and unfiltered
natural water. This method was developed to
eliminate the use of acid dichromate
preservative and to provide capability to
measure ambient mercury concentrations in
natural water. Dissolved mercury includes all
oxidizable mercury species present in natural
water that has been filtered through a 0.45-
micrometer pore size capsule filter. Wholewater
recoverable mercury includes dissolved
mercury species and mercury species
adsorbed to particulate matter in unfiltered
natural water. Mercury species can include
elemental mercury, mercury (II), mercury (II)
complexes, various alkyl- and phenylmercury
compounds, and other forms of
mercury. In this method, samples are
collected and processed according to standard
U.S. Geological Survey protocols. Samples
are preserved onsite with 6N hydrochloric
acid in a ratio of 1 to 100 in a borosilicateglass
bottle with fluoropolymer-lined cap.
Mercury species are oxidized to mercury (II)
by using bromine monochloride; excess
oxidation reagent is neutralized with
hydroxylamine hydrochloride. Elemental
mercury produced after adding stannous
chloride is purged from the solution with
ultrapure argon gas into a cell in which the
mercury concentration is measured by atomic
fluorescence emission at 253.7 nanometers.
The analytical response is linear up to 125
nanograms per liter (ng/L) of mercury, and
the short-term method detection limit is about
5 ng/L. The analytical variability at 50 ng/L
is about 10 percent.
This report describes the method and
compares the use of hydrochloric acid to acid
dichromate as a field preservative. Ambient
mercury concentrations in hydrochloric acidpreserved
samples stored in borosilicate-glass
bottles with fluoropolymer-lined caps are
shown to be stable for at least 30 days.
Mercury concentrations are stable for at least
5 months after bromine monochloride is
added to the sample bottles in the laboratory.
The long-term average percent recoveries at
20, 45, and 75 ng/L in reagent water, filtered
and unfiltered ground water, and filtered and
unfiltered surface water range from 89 to 108,
96 to 103, and 94 to 98 percent, respectively.
|Genre: ||USGS Numbered Series
|Citation Author: ||Garbarino, John R.; Damrau, Donna L.
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|Citation Language: ||ENGLISH
|Citation Larger Work Title: ||Water-Resources Investigations Report
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|Citation Phsyical Description: ||16 p.
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|Citation Series: ||Water-Resources Investigations Report
|Citation Series Code: ||WRI
|Citation Series Number: ||2001-4132
|Citation Search Results Text: ||Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory; determination of organic plus inorganic mercury in filtered and unfiltered natural water with cold vapor; atomic fluorescence spectrometry; 2001; WRI; 2001-4132; Water-Resources Investigations Report; Garbarino, John R.; Damrau, Donna L.
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|Citation Year: ||2001
|Text: ||Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory; determination of organic plus inorganic mercury in filtered and unfiltered natural water with cold vapor; atomic fluorescence spectrometry; 2001; WRI; 2001-4132; Water-Resources Investigations Report; Garbarino, John R.; Damrau, Donna L.
|URL (THUMBNAIL): ||http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg
|URL (INDEX PAGE): ||http://nwql.usgs.gov/rpt.shtml?WRIR-01-4132
|Date Other: ||Mon, 1 Oct 2001 00:00 -0500