Mechanisms of detoxification by humic substances

Тип публикации: глава из книги

Год издания: 2013

Идентификатор DOI: 10.1007/978-94-007-5634-2_95

Ключевые слова: Bioassays, Humic substances, Toxicity

Аннотация: This chapter classifies detoxifying effects of humic substances (HS) in solutions of toxic compounds. A series of organic redox compounds (quinones and phenols) and metal salts were used as model toxic compounds. Marine luminous bacteria Photobacterium phosphoreum and bioluminescent system of coupled enzymatic reactions were applied as bioassays to monitor toxicity of solutions. Ability of HS to decrease or increase toxicity of the solutions was demonstrated. Detoxification coefficients were calculated, and HS detoxifying concentrations were determined. The detoxifying effects were explained by (1) decrease of free toxic compound content in water solutions under binding and redox neutralization by HS, (2) increase of biochemical reaction rates in a bioassay system in the presence of HS, and (3) enhancement of mucous layers on cell surface as a response to unfavorable impact of toxicants. Detoxifying mechanisms (2) and (3) reveal the active role of bioassay systems in detoxification processes. © 2013 Zhejiang University Press and Springer Science+Business Media Dordrecht. All rights are reserved.

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Издание

Журнал: FUNCTIONS OF NATURAL ORGANIC MATTER IN CHANGING ENVIRONMENT

Выпуск журнала: Vol. 9789400756342

Номера страниц: 523-527

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