Wuttig, K and Townsend, AT and van der Merwe, P and Gault-Ringold, M and Holmes, T and Schallenberg, C and Latour, P and Tonnard, M and Rijkenberg, MJA and Lannuzel, D and Bowie, AR, Critical evaluation of a seaFAST system for the analysis of trace metals in marine samples, Talanta, 197 pp. 653-668. ISSN 0039-9140 (2019) [Refereed Article]
Copyright 2019 Elsevier B.V.
Method accuracy (both short – days to weeks - and long term – months to years) were evaluated through extensive analysis of a range of oceanographic standard reference samples including SAFe D1 (n = 20), D2 (n = 3), S (n = 15), GEOTRACES GD (n = 6), GSC (n = 42) and GSP (n = 42), as well as NASS-6 (n = 6). Measured values for oceanographic samples were found to agree with consensus values to within ± 6% for Cd, Cu, Fe, Ni, Pb and Zn. Offsets were noted for Co (labile fraction only; no UV oxidation), Mn (difference also noted in other recent studies) and Ti (limited reference values). No consensus values currently exist for Ga. Iron and Mn in Southern Ocean samples were also independently verified via flow injection analysis methods (R2 = 0.95, n = 244 (Fe) and 0.92, n = 85 (Mn), paired t-test, p ≪0.05). Precisions over four years were evaluated through analysis of community seawater samples as well as a range of bulk in-house seawaters (3 sources, each n~100) and acid blanks (n = 250), and were typically found to be within 5–8%, depending on analyte and concentration.
Values presented here represent one of the largest independent data sets for these reference samples, as well as the most documented comprehensive suite of GSP and GSC values currently available (consensus values have not yet been released). Samples covering a range of salinities (0–60) were investigated to demonstrate method versatility, with excellent recoveries noted using the seaFAST Nobias PA1 column (>98% for most elements, with 70–80% for Ga and Ti). By way of example, data is presented showing the application of the method to samples collected on the Kerguelen plateau in the Indian sector of the Southern Ocean (HEOBI voyage, January-February 2016) and in land-fast ice and brine collected near Davis station, Antarctica, in austral summer 2015 (with a salinity range from 0 to 73 g kg−1). Finally, a range of recommendations for successful implementation of a seaFAST system are provided, along with considerations for future investigation.
|Item Type:||Refereed Article|
|Keywords:||trace metals, seawater, seaFAST preconcentration system, sea ice and brines, SF-ICP-MS, GEOTRACES|
|Research Division:||Chemical Sciences|
|Research Group:||Analytical Chemistry|
|Research Field:||Instrumental Methods (excl. Immunological and Bioassay Methods)|
|Objective Group:||Physical and Chemical Conditions of Water|
|Objective Field:||Physical and Chemical Conditions of Water in Marine Environments|
|UTAS Author:||Wuttig, K (Dr Kathrin Wuttig)|
|UTAS Author:||Townsend, AT (Associate Professor Ashley Townsend)|
|UTAS Author:||van der Merwe, P (Dr Pier van der Merwe)|
|UTAS Author:||Gault-Ringold, M (Dr Melanie East)|
|UTAS Author:||Holmes, T (Mr Thomas Holmes)|
|UTAS Author:||Schallenberg, C (Dr Christina Schallenberg)|
|UTAS Author:||Latour, P (Miss Pauline Latour)|
|UTAS Author:||Tonnard, M (Miss Manon Tonnard)|
|UTAS Author:||Lannuzel, D (Associate Professor Delphine Lannuzel)|
|UTAS Author:||Bowie, AR (Associate Professor Andrew Bowie)|
|Web of Science® Times Cited:||2|
|Deposited By:||CRC-Antarctic Climate & Ecosystems|
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