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RESEARCH ARTICLE (Open Access)

Lead solubility in seawater: an experimental study

Brad M. Angel A , Simon C. Apte A C , Graeme E. Batley A and Mark D. Raven B
+ Author Affiliations
- Author Affiliations

A CSIRO Land and Water, Locked Bag 2007, Kirrawee, NSW 2232, Australia.

B CSIRO Land and Water, Gate 4, Waite Road, Urrbrae, SA 5064, Australia.

C Corresponding author. Email: simon.apte@csiro.au

Environmental Chemistry 13(3) 489-495 https://doi.org/10.1071/EN15150
Submitted: 14 July 2015  Accepted: 15 September 2015   Published: 30 November 2015

Journal Compilation © CSIRO Publishing 2016 Open Access CC BY-NC-ND

Environmental context. Many trace metals including lead are only sparingly soluble in seawater and may exist in both dissolved and particulate forms (e.g. as precipitates). Aquatic organisms may experience different toxic effects from exposure to dissolved and particulate trace metals. This study reports the limits to lead solubility in seawater that influence the exposure to these forms of lead in the field and the laboratory.

Abstract. A combination of laboratory investigations and thermodynamic modelling were conducted in order to gain an understanding of the factors controlling lead solubility in seawater. In experiments where increasing amounts of lead were added to seawater (in order to avoid supersaturation) and equilibrated for up to 28 days, the maximum solubility was ~2 mg L–1 (pH 8.15, 22 °C). However, at higher added lead concentrations, which caused the rapid formation of lead precipitates, the solution chemistry became dynamic and the observed solubility was markedly lower, varying with both reaction time and precipitate concentration. For instance, when seawater solutions were spiked with 10 mg L–1 of total lead, precipitation occurred immediately and only 1.6 mg L–1 of dissolved lead was measured after 1 h, with this concentration decreasing to 1.3 mg L–1 after 28 days. The solubility of lead in artificial seawater (0.68 mg L–1) was much lower than in natural seawater. This difference was attributed to the significant role played by natural organic matter in complexing dissolved lead. X-Ray diffraction and elemental analysis data suggest that the phase controlling lead solubility is a previously unidentified lead chlorocarbonate, which rapidly transforms to hydrocerussite on washing with deionised water. These observations are of particular relevance to toxicity tests where organisms are exposed to wide ranges of metal concentrations in order to obtain dose–response curves.

Additional keywords: metal solubility, precipitation, speciation.


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