Rapid and complete dehalogenation of halonitromethanes in simulated gastrointestinal tract and its influence on toxicity.

Abstract:

:Halonitromethanes (HNMs) as one typical class of nitrogenous disinfection byproducts in drinking water and wastewater are receiving attentions due to their high toxicity. This study applied a simulator of the human gastrointestinal tract to determine the dehalogenation processes of trichloronitromethane, bromonitromethane and bromochloronitromethane for the first time. Influence of digestion process of HNMs on gut microbiota and hepatotoxicity was further analyzed. Results showed that the three HNMs were rapidly and completely dehalogenated in the gastrointestinal tract, especially in the stomach (2 h retention Time) and small intestine (4 h retention Time). Mucin, cysteine, pancreatin and bile salts in the digestive juice played major roles in the dehalogenation process. HNMs and their dehalogenation products in the resulting fluids of stomach induced the highest toxicity followed by those in intestine and colon, exhibiting dose-dependent effects. Although most HNMs were degraded in the stomach and small intestine, residual HNMs entered into colon changed the microbial community. Abundance of several genera, such as Bacteroides, Lachnospiraceae_unassigned and Lactobacillus had high correlation with exposure concentration of HNMs. This study sheds new light on dehalogenation and toxic processes of HNMs by oral exposure, which provides basic data for their human health risk assessment.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Yin J,Wu B,Liu S,Hu S,Gong T,Cherr GN,Zhang XX,Ren H,Xian Q

doi

10.1016/j.chemosphere.2018.08.039

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

1147-1155

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(18)31514-5

journal_volume

211

pub_type

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