Fate and health risk of legacy POPs in the residential condition of urban Nepal

Ishwar Chandra Yadav, Ningombam Linthoingambi Devi, Jun Li, Gan Zhang

Overview

Monitoring of persistent organic pollutants in the indoor environment can serve as an important indicator for the wellbeing of humankind as humans spend most of their time inside houses. This article discusses the fate and risk of legacy POPs exposure in the indoor environment of Nepal.

Summary

Due to technical constraints and lack of scientific advancement, the contamination level and fate of persistent organic pollutant and associated health risk is unknown in Nepal. Hence, this study fills these gaps

Author Comments

Dr Ishwar Chandra Yadav, PhD
Dr Ishwar Chandra Yadav, PhD
Tokyo University of Agriculture and Technology
Research Scientist
Biogeochemsitry
Tokyo, Japan | Japan
valuable and informative paperDr Ishwar Chandra Yadav, PhD

Examining the role of total organic carbon and black carbon in the fate of legacy persistent organic pollutants (POPs) in indoor dust from Nepal: Implication on human health.

Authors:
Dr Ishwar Chandra Yadav, PhD
Dr Ishwar Chandra Yadav, PhD
Tokyo University of Agriculture and Technology
Research Scientist
Biogeochemsitry
Tokyo, Japan | Japan

Ecotoxicol Environ Saf 2019 Jul 20;175:225-235. Epub 2019 Mar 20.

State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, PR China.

Despite the fact that the consumption and import of legacy persistent organic pollutants (POPs) have been stopped in Nepal since 2001, they are still of worry for human prosperity and the environment because of their persistence behavior and constant release from sources that are presently being used. The essential objective of this study was to assess the concentration and spatial distribution of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in residential dust from Nepal keeping in mind the end goal to evaluate the importance of total organic carbon (TOC) and black carbon (BC) in the fate of legacy POPs. Additionally, health risk exposure via dust ingestion and dermal absorption was estimated to evaluate the significance of dust media for human exposure. Results demonstrated that ∑OCPs in dust was 37 times greater than ∑PCBs. DDT was mostly dominated in the dust, and contributed 90% of the ∑OCPs, while hexa-CBs predominated among PCBs and represented 34% of ∑PCBs. Birgunj and Biratnagar had a relatively higher level of ∑OCPs and ∑PCBs than those of Kathmandu and Pokhara. TOC and BC showed a poor connection with OCPs, recommending little or no role. However, PCB in the dust, especially low congeners was strongly linked with TOC but not BC indicating the significant role of TOC. The daily risk exposure estimation indicated dermal absorption through dust as the principal means of OCPs/PCBs intake to both adult and children population. These estimated exposures were 2-4 orders of magnitude inferior to their corresponding reference dose showing insignificant risk.

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Source
http://dx.doi.org/10.1016/j.ecoenv.2019.03.048DOI Listing
July 2019
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