Microbial ecotoxicity and mutagenicity of 1-hydroxypyrene and its photoproducts.

Abstract:

:1-Hydroxypyrene (1-HP) is a carcinogenic and slightly water-soluble polycyclic aromatic hydrocarbon. Ecotoxicity and mutagenicity of 1-HP and its photoproducts, and the effect of Mn2+ and Cu2+ on their mutagenicity were measured with microbial assay in this study. The assay includes spread plate counting, direct counting, microbial mineralization of 14C-UL-D-glucose and Mutatox Test. At the concentration examined (0.8 microM), the photoproducts (after 1.5 h solar irradiation) of 1-HP inhibited microbial glucose mineralization activity (by 64%) after microbial assemblages of a local reservoir site were exposed for 1 day. However, heterotrophic bacteria were able to utilize 1-HP photoproducts as the growth substrates and increase viability counts by up to 4.75-folds. 1-HP exhibited positive response to Mutatox Test in both direct medium and S-9 medium, with the lowest observable effective concentration of 0.625 microM in the test with direct medium. After photolysis, 1-HP decreased its mutagenicity. Mn2+ (312.5 microM-5 mM) and Cu2+ (6.25-100 microM) themselves are not mutagenic. However, addition of the metal ions before or after photolysis modifies the light readings of 1-HP during the test. Therefore, presence of metal ions could affect the genotoxicity of 1-HP in aquatic environments, depending on timing of the addition.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Hwang HM,Shi X,Ero I,Jayasinghe A,Dong S,Yu H

doi

10.1016/s0045-6535(01)00046-7

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

445-51

issue

4-5

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(01)00046-7

journal_volume

45

pub_type

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