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Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment

Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment
Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment
Atmospheric deposition of trace elements and isotopes (TEI) is an important source of trace metals to the open ocean, impacting TEI budgets and distributions, stimulating oceanic primary productivity, and influencing biological community structure and function. Thus, accurate sampling of aerosol TEIs is a vital component of ongoing GEOTRACES cruises, and standardized aerosol TEI sampling and analysis procedures allow the comparison of data from different sites and investigators. Here, we report the results of an aerosol analysis intercalibration study by seventeen laboratories for select GEOTRACES-relevant aerosol species (Al, Fe, Ti, V, Zn, Pb, Hg, NO3?, and SO42?) for samples collected in September 2008. The collection equipment and filter substrates are appropriate for the GEOTRACES program, as evidenced by low blanks and detection limits relative to analyte concentrations. Analysis of bulk aerosol sample replicates were in better agreement when the processing protocol was constrained (± 9% RSD or better on replicate analyses by a single lab, n = 7) than when it was not (generally 20% RSD or worse among laboratories using different methodologies), suggesting that the observed variability was mainly due to methodological differences rather than sample heterogeneity. Much greater variability was observed for fractional solubility of aerosol trace elements and major anions, due to differing extraction methods. Accuracy is difficult to establish without an SRM representative of aerosols, and we are developing an SRM for this purpose. Based on these findings, we provide recommendations for the GEOTRACES program to establish consistent and reliable procedures for the collection and analysis of aerosol samples.
1541-5856
62-78
Morton, Peter L.
b759bd86-5942-4389-8962-ac9b84981e45
Landing, William M.
26eb4b62-d05c-42bb-a757-f840915f6576
Hsu, Shih-Chieh
4933d080-1f40-4db3-9936-d4995fab65ad
Milne, Angela
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Aguilar-Islas, Ana M.
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Baker, Alex R.
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Bowie, Andrew R.
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Buck, Clifton S.
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Gao, Yuan
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Gichuki, Susan
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Hastings, Meredith G.
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Hatta, Mariko
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Johansen, Anne M.
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Losno, Rémi
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Mead, Chris
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Patey, Matthew D.
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Swarr, Gretchen
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Vandermark, Amanda
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Zamora, Lauren M.
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Morton, Peter L.
b759bd86-5942-4389-8962-ac9b84981e45
Landing, William M.
26eb4b62-d05c-42bb-a757-f840915f6576
Hsu, Shih-Chieh
4933d080-1f40-4db3-9936-d4995fab65ad
Milne, Angela
39b44fbd-8f5e-40ea-80c9-244c20998020
Aguilar-Islas, Ana M.
95163f7a-93d5-4d52-8da0-c793d05bc8d7
Baker, Alex R.
3a011c8c-c15a-4080-9602-6f3628fdca4a
Bowie, Andrew R.
b693c3a6-8975-4095-ad4b-81a5a3bb1f29
Buck, Clifton S.
71ceb13c-c706-4071-a910-b0018a84b3ff
Gao, Yuan
8691bd5a-558e-4616-a055-37d1164ffe25
Gichuki, Susan
37a2bf91-f713-4669-8a68-4b7907cccd7f
Hastings, Meredith G.
d5011897-037c-42a6-9c03-892ed0f7006f
Hatta, Mariko
b8c210ca-90aa-4660-b1b7-3538b120e31d
Johansen, Anne M.
d4edee2b-9eda-4384-8418-9585766ec52b
Losno, Rémi
add5884f-db89-420e-9baa-bf1e41832a6a
Mead, Chris
54953f74-9b7f-42b8-b907-8ae8f530353d
Patey, Matthew D.
224dd2f8-b804-4839-b9d2-b5ace922bd87
Swarr, Gretchen
f9f606fb-065d-42ab-8963-1c79338449ec
Vandermark, Amanda
685f30d1-9ba5-4345-ada0-face10dd7767
Zamora, Lauren M.
82485829-8fdb-4f01-b022-1d653e2f6699

Morton, Peter L., Landing, William M., Hsu, Shih-Chieh, Milne, Angela, Aguilar-Islas, Ana M., Baker, Alex R., Bowie, Andrew R., Buck, Clifton S., Gao, Yuan, Gichuki, Susan, Hastings, Meredith G., Hatta, Mariko, Johansen, Anne M., Losno, Rémi, Mead, Chris, Patey, Matthew D., Swarr, Gretchen, Vandermark, Amanda and Zamora, Lauren M. (2013) Methods for the sampling and analysis of marine aerosols: results from the 2008 GEOTRACES aerosol intercalibration experiment. Limnology and Oceanography: Methods, 11, 62-78. (doi:10.4319/lom.2013.11.62).

Record type: Article

Abstract

Atmospheric deposition of trace elements and isotopes (TEI) is an important source of trace metals to the open ocean, impacting TEI budgets and distributions, stimulating oceanic primary productivity, and influencing biological community structure and function. Thus, accurate sampling of aerosol TEIs is a vital component of ongoing GEOTRACES cruises, and standardized aerosol TEI sampling and analysis procedures allow the comparison of data from different sites and investigators. Here, we report the results of an aerosol analysis intercalibration study by seventeen laboratories for select GEOTRACES-relevant aerosol species (Al, Fe, Ti, V, Zn, Pb, Hg, NO3?, and SO42?) for samples collected in September 2008. The collection equipment and filter substrates are appropriate for the GEOTRACES program, as evidenced by low blanks and detection limits relative to analyte concentrations. Analysis of bulk aerosol sample replicates were in better agreement when the processing protocol was constrained (± 9% RSD or better on replicate analyses by a single lab, n = 7) than when it was not (generally 20% RSD or worse among laboratories using different methodologies), suggesting that the observed variability was mainly due to methodological differences rather than sample heterogeneity. Much greater variability was observed for fractional solubility of aerosol trace elements and major anions, due to differing extraction methods. Accuracy is difficult to establish without an SRM representative of aerosols, and we are developing an SRM for this purpose. Based on these findings, we provide recommendations for the GEOTRACES program to establish consistent and reliable procedures for the collection and analysis of aerosol samples.

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Published date: February 2013
Organisations: Ocean and Earth Science

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Local EPrints ID: 353507
URI: http://eprints.soton.ac.uk/id/eprint/353507
ISSN: 1541-5856
PURE UUID: 454024b1-8306-402a-8f69-65f09ff09515

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Date deposited: 07 Jun 2013 09:51
Last modified: 08 Jan 2022 00:20

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Contributors

Author: Peter L. Morton
Author: William M. Landing
Author: Shih-Chieh Hsu
Author: Angela Milne
Author: Ana M. Aguilar-Islas
Author: Alex R. Baker
Author: Andrew R. Bowie
Author: Clifton S. Buck
Author: Yuan Gao
Author: Susan Gichuki
Author: Meredith G. Hastings
Author: Mariko Hatta
Author: Anne M. Johansen
Author: Rémi Losno
Author: Chris Mead
Author: Matthew D. Patey
Author: Gretchen Swarr
Author: Amanda Vandermark
Author: Lauren M. Zamora

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