Distribution of organochlorine pesticides in surface and deep waters of the Southern Indian Ocean and coastal Antarctic waters

Qureshi, Asif (2023) Distribution of organochlorine pesticides in surface and deep waters of the Southern Indian Ocean and coastal Antarctic waters. Environmental Pollution, 321. p. 121206. ISSN 0269-7491

Text
1-s2.0-S0269749123002087-main.pdf - Published Version
Download (4MB)

Abstract

Antarctica is a remote and pristine region. Yet it plays a vital role in biogeochemical cycles of global anthropogenic contaminants, such as persistent organic pollution (POPs). This work reports the distribution of legacy and new POPs in surface and depth profiles/deeper water of the Southern Indian Ocean (SIO) and the coast of Antarctica (COA). Samples were collected during the 10th Indian Southern Ocean expedition (SOE-10) in the year 2017. Concentrations of ∑HCH (hexachlorocyclohexane), ∑DDT (dichlorodiphenyltrichloroethane), and ∑ENDO (endosulfan) in surface seawater from the SIO region ranged between not detected (ND) to 1.21 pg/Liter (pg L−1) (average. ± s.d.: 0.35 ± 0.42 pg L−1), ND to 1.83 pg L−1 (0.69 ± 84 pg L−1), and ND - to 2.06 pg L−1 (0.56 ± 0., 88 pg L−1), respectively. The concentrations of ∑HCH, ∑DDT, and ∑ENDO in COA ranged from ND to 0.98 pg L−1 (0.25 ± 0.27 pg L−1), ND to 3.61 pg L−1(0.50 ± 1.08 pg L−1), and ND to 2.09 pg L−1 (0.45 ± 0.84 pg L−1), respectively. Concentrations of isomers of endosulfan, and largely of HCHs, suggested an aged source. Some concentration ratios of α-to γ-HCH were close to 1, indicating a contribution from ongoing sources. Results indicate the important role of ocean currents in mediating the transport and detection of OCPs. As such, OCPs dynamics in deeper oceans may play an important role in OCPs cycling in the marine environment.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Qureshi, Asif	http://www.orcid.org/0000-0003-3329-0166

Item Type:

Article

Uncontrolled Keywords:

Distribution; Organochlorine pesticides; Persistent organic pollutants; Pristine; Organic pollutants; Antarctic Regions; Endosulfan; Environmental Monitoring; Hexachlorocyclohexane; Hydrocarbons, Chlorinated; Indian Ocean; Pesticides; Water Pollutants, Chemical; Indian Ocean; Indian Ocean (South); Southern Ocean; Biogeochemistry; Insecticides; Isomers; Ocean currents; chlorphenotane; endosulfan; hexachlorocyclohexane; organochlorine pesticide; sea water; surface water; chlorinated hydrocarbon; hexachlorocyclohexane; pesticide; Antarctica; Biogeochemical cycle; Deepwater; Distribution; Endosulfans; Organochlorine pesticides; Persistent organic pollutant; Persistent organic pollutions; Pristine; Southern indian oceancoastal water; marine pollution; organochlorine pesticide; persistent organic pollutant; pristine environment; spatial distribution; Antarctica; Article; biogeochemistry; coastal waters; concentration ratio; human impact (environment); Indian Ocean; marine environment; ocean current; persistent organic pollutant; seashore; travel; water pollution; Antarctica; environmental monitoring; Indian Ocean; water pollutant

Subjects:

Civil Engineering
Civil Engineering > Water resources engineering

Divisions:

Department of Civil Engineering

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

25 Aug 2023 04:31

Last Modified:

25 Aug 2023 04:31

URI:

http://raiithold.iith.ac.in/id/eprint/11620