Unraveling the causes of the toxicity of extremely acid waters of volcanic origin.

A.J. Lohr, M.J. de Kort, N.M. van Straalen, C.A.M. van Gestel

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A river ecosystem in East Java, Indonesia, fed by a volcanic lake with high concentrations of dissolved metals and a low pH, was found to support only few macroinvertebrates. To unravel the causes of toxicity and to determine the level of dilution necessary to obtain non-toxic water, a bioassay was conducted with the fairy shrimp Thamnocephalus platyurus. A partial toxicity identification evaluation (TIE) approach was used with EDTA as a chelating agent to relate toxicity to pH and metal concentrations. Three water samples were tested, with pHs ranging from 0.72 to 4.5, and diluted with water from a neutral river to different degrees. The dilution factor necessary to achieve no more than 50% mortality in the Thamnotox test (Ldf
Original languageEnglish
Pages (from-to)743-749
JournalEnvironment International
Volume33
DOIs
Publication statusPublished - 2007

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