Premium
An intercomparison of procedures for the determination of total mercury in seawater and recommendations regarding mercury speciation during GEOTRACES cruises
Author(s) -
Lamborg Carl H.,
Hammerschmidt Chad R.,
Gill Gary A.,
Mason Robert P.,
Gichuki Susan
Publication year - 2012
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.4319/lom.2012.10.90
Subject(s) - geotraces , seawater , mercury (programming language) , bottle , environmental chemistry , environmental science , chemistry , oceanography , geology , materials science , computer science , programming language , composite material
We conducted a laboratory intercomparison of total mercury (Hg) determination in seawater collected during U.S. GEOTRACES Intercalibration cruises in 2008 and 2009 to the NW Atlantic and NE Pacific Oceans. Results indicated substantial disagreement between the participating laboratories, which appeared to be affected most strongly by bottle cleanliness and preservation procedures. In addition, we examined the effectiveness of various collection and sample preparation procedures that may be used on future GEOTRACES cruises. The type of sampling system and filtration medium appeared to make little difference to results. Finally, and in light of results from experiments that considered sample bottle material effect and the development of new methods for CH 3 Hg + extraction from seawater, we propose a recommended procedure for determining all four of the major Hg species in seawater (elemental, dimethyl‐, monomethyl‐, and total Hg).