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Assessment of leaching protocols to determine the solubility of trace metals in aerosols

Citation

Perron, MMG and Strzelec, M and Gault-Ringold, M and Proemse, BC and Boyd, PW and Bowie, AR, Assessment of leaching protocols to determine the solubility of trace metals in aerosols, Talanta, 208 Article 120377. ISSN 0039-9140 (2020) [Refereed Article]

Copyright Statement

Copyright 2019 Elsevier B.V.

DOI: doi:10.1016/j.talanta.2019.120377

Abstract

Atmospheric deposition of aerosols to the ocean provides an important pathway for the supply of vital micronutrients, including trace metals. These trace metals are essential for phytoplankton growth, and therefore their delivery to marine ecosystems can strongly influence the ocean carbon cycle. The solubility of trace metals in aerosols is a key parameter to better constrain their potential impact on phytoplankton growth. To date, a wide range of experimental approaches and nomenclature have been used to define aerosol trace metal solubility, making data comparison between studies difficult. Here we investigate and discuss several laboratory leaching protocols to determine the solubility of key trace metals in aerosol samples, namely iron, cobalt, manganese, copper, lead, vanadium, titanium and aluminium. Commonly used techniques and tools are also considered such as enrichment factor calculations and air mass back-trajectory projections and recommendations are given for aerosol field sampling, laboratory processing (including leaching and digestion) and analytical measurements. Finally, a simple 3-step leaching protocol combining commonly used protocols is proposed to operationally define trace metal solubility in aerosols. The need for standard guidelines and protocols to study the biogeochemical impact of atmospheric trace metal deposition to the ocean has been increasingly emphasised by both the atmospheric and oceanographic communities. This lack of standardisation currently limits our understanding and ability to predict ocean and climate interactions under changing environmental conditions.

Item Details

Item Type:Refereed Article
Keywords:trace metals, iron, aerosols, ocean, micronutrients, leaching protocols, solubility
Research Division:Earth Sciences
Research Group:Atmospheric Sciences
Research Field:Atmospheric Aerosols
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
UTAS Author:Perron, MMG (Miss Morgane Perron)
UTAS Author:Strzelec, M (Mr Michal Strzelec)
UTAS Author:Gault-Ringold, M (Dr Melanie East)
UTAS Author:Proemse, BC (Dr Bernadette Proemse)
UTAS Author:Boyd, PW (Professor Philip Boyd)
UTAS Author:Bowie, AR (Professor Andrew Bowie)
ID Code:135165
Year Published:2020
Deposited By:Oceans and Cryosphere
Deposited On:2019-10-03
Last Modified:2019-11-06
Downloads:0

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