Influences of macroalga-derived dissolved organic carbon on the aquatic toxicity of copper and cadmium

Martin T.K. Tsui; Wen Xiong Wang; Ming H. Wong

doi:10.1016/j.chemosphere.2006.03.073

Influences of macroalga-derived dissolved organic carbon on the aquatic toxicity of copper and cadmium

Martin T.K. Tsui, Wen Xiong Wang, Ming H. Wong^*

^*Corresponding author for this work

Department of Biology

Research output: Contribution to journal › Journal article › peer-review

3 Citations (Scopus)

Abstract

In this study, the effect of dissolved organic carbon (DOC) derived from macroalga (Sargassum) on the acute toxicity of copper (Cu) and cadmium (Cd) to a freshwater cladoceran (Daphnia magna) was investigated. Potassium-loaded macroalga was incubated with ultrapure water to extract macroalgal DOC, which was then spiked with the constituents of the Elendt M7 hard water media. The 48 h median lethal concentration of Cu increased linearly with DOC levels but that of Cd was relatively independent of DOC levels (0-44 mg l^-1). The independence of Cd toxicity on DOC level might be due to the competitive effect of high calcium concentrations in the media with Cd for the binding sites of DOC. The decreased Cu toxicity was a result of reduced Cu uptake as evidenced in a separate accumulation test. Also, the capability of the macroalgal DOC on reducing Cu toxicity was found to be comparable to DOC tested in other studies. Therefore, the present study suggested that the biosorption treatment process using macroalgae should consider the effect of DOC release from the biomass as a step of modifying the metal toxicity as well as influencing metal biosorption capacity.

Original language	English
Pages (from-to)	1831-1835
Number of pages	5
Journal	Chemosphere
Volume	65
Issue number	10
DOIs	https://doi.org/10.1016/j.chemosphere.2006.03.073
Publication status	Published - Dec 2006

Scopus Subject Areas

Environmental Engineering
Environmental Chemistry
General Chemistry
Pollution
Health, Toxicology and Mutagenesis

User-Defined Keywords

Daphnia magna
Dissolved organic carbon
Macroalga
Metal toxicity

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10.1016/j.chemosphere.2006.03.073

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title = "Influences of macroalga-derived dissolved organic carbon on the aquatic toxicity of copper and cadmium",

abstract = "In this study, the effect of dissolved organic carbon (DOC) derived from macroalga (Sargassum) on the acute toxicity of copper (Cu) and cadmium (Cd) to a freshwater cladoceran (Daphnia magna) was investigated. Potassium-loaded macroalga was incubated with ultrapure water to extract macroalgal DOC, which was then spiked with the constituents of the Elendt M7 hard water media. The 48 h median lethal concentration of Cu increased linearly with DOC levels but that of Cd was relatively independent of DOC levels (0-44 mg l-1). The independence of Cd toxicity on DOC level might be due to the competitive effect of high calcium concentrations in the media with Cd for the binding sites of DOC. The decreased Cu toxicity was a result of reduced Cu uptake as evidenced in a separate accumulation test. Also, the capability of the macroalgal DOC on reducing Cu toxicity was found to be comparable to DOC tested in other studies. Therefore, the present study suggested that the biosorption treatment process using macroalgae should consider the effect of DOC release from the biomass as a step of modifying the metal toxicity as well as influencing metal biosorption capacity.",

keywords = "Daphnia magna, Dissolved organic carbon, Macroalga, Metal toxicity",

author = "Tsui, {Martin T.K.} and Wang, {Wen Xiong} and Wong, {Ming H.}",

note = "Funding Information: The authors thank Mr. Ben Yeung for collecting the macroalga and Mr. Eric Yuen for providing analytical support. This study was fully supported by the Area of Excellence Scheme under the University Grants Committee of the Hong Kong Special Administration Region (CityU, Project No. AoE/P-04/04).",

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AU - Wang, Wen Xiong

AU - Wong, Ming H.

N1 - Funding Information: The authors thank Mr. Ben Yeung for collecting the macroalga and Mr. Eric Yuen for providing analytical support. This study was fully supported by the Area of Excellence Scheme under the University Grants Committee of the Hong Kong Special Administration Region (CityU, Project No. AoE/P-04/04).

PY - 2006/12

Y1 - 2006/12

N2 - In this study, the effect of dissolved organic carbon (DOC) derived from macroalga (Sargassum) on the acute toxicity of copper (Cu) and cadmium (Cd) to a freshwater cladoceran (Daphnia magna) was investigated. Potassium-loaded macroalga was incubated with ultrapure water to extract macroalgal DOC, which was then spiked with the constituents of the Elendt M7 hard water media. The 48 h median lethal concentration of Cu increased linearly with DOC levels but that of Cd was relatively independent of DOC levels (0-44 mg l-1). The independence of Cd toxicity on DOC level might be due to the competitive effect of high calcium concentrations in the media with Cd for the binding sites of DOC. The decreased Cu toxicity was a result of reduced Cu uptake as evidenced in a separate accumulation test. Also, the capability of the macroalgal DOC on reducing Cu toxicity was found to be comparable to DOC tested in other studies. Therefore, the present study suggested that the biosorption treatment process using macroalgae should consider the effect of DOC release from the biomass as a step of modifying the metal toxicity as well as influencing metal biosorption capacity.

AB - In this study, the effect of dissolved organic carbon (DOC) derived from macroalga (Sargassum) on the acute toxicity of copper (Cu) and cadmium (Cd) to a freshwater cladoceran (Daphnia magna) was investigated. Potassium-loaded macroalga was incubated with ultrapure water to extract macroalgal DOC, which was then spiked with the constituents of the Elendt M7 hard water media. The 48 h median lethal concentration of Cu increased linearly with DOC levels but that of Cd was relatively independent of DOC levels (0-44 mg l-1). The independence of Cd toxicity on DOC level might be due to the competitive effect of high calcium concentrations in the media with Cd for the binding sites of DOC. The decreased Cu toxicity was a result of reduced Cu uptake as evidenced in a separate accumulation test. Also, the capability of the macroalgal DOC on reducing Cu toxicity was found to be comparable to DOC tested in other studies. Therefore, the present study suggested that the biosorption treatment process using macroalgae should consider the effect of DOC release from the biomass as a step of modifying the metal toxicity as well as influencing metal biosorption capacity.

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KW - Dissolved organic carbon

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Influences of macroalga-derived dissolved organic carbon on the aquatic toxicity of copper and cadmium

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