AI Article Synopsis
- More than two-thirds of the world's nickel deposits are found in tropical regions, particularly in Southeast Asia and Melanesia, where there is a need for environmental risk assessment tools due to rising nickel mining and processing activities.
- Currently, there are no specific water or sediment quality guidelines for nickel in tropical ecosystems, and applying temperate system guidelines may not be appropriate.
- Research has revealed a lack of sufficient nickel toxicity data for tropical freshwater sediments, highlighting the need for more studies to establish reliable ecological protection guidelines in these areas.
Article Abstract
More than two-thirds of the world's nickel (Ni) lateritic deposits are in tropical regions, and just less than half are within South East Asia and Melanesia (SEAM). With increasing Ni mining and processing in SEAM, environmental risk assessment tools are required to ensure sustainable development. Currently, there are no tropical-specific water or sediment quality guideline values for Ni, and the appropriateness of applying guideline values derived for temperate systems (e.g., Europe) to tropical ecosystems is unknown. Databases of Ni toxicity and toxicity tests for tropical freshwater and sediment species were compiled. Nickel toxicity data were ranked, using a quality assessment, identifying data to potentially use to derive tropical-specific Ni guideline values. There were no data for Ni toxicity in tropical freshwater sediments. For tropical freshwaters, of 163 Ni toxicity values for 40 different species, high-quality chronic data, based on measured Ni concentrations, were found for just 4 species (1 microalga, 2 macrophytes, and 1 cnidarian), all of which were relevant to SEAM. These data were insufficient to calculate tropical-specific guideline values for long-term aquatic ecosystem protection in tropical regions. For derivation of high-reliability tropical- or SEAM-specific water and sediment quality guideline values, additional research effort is required. Using gap analysis, we recommend how research gaps could be filled. Environ Toxicol Chem 2018;37:293-317. © 2017 SETAC.
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| http://dx.doi.org/10.1002/etc.3988 | DOI Listing |
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