- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
| Abstract Submission No. | ABS-2022-02-0231 |
| Title of Abstract | Legacy organic pollutants (Organochlorine pesticides and Polychlorinated biphenyls) distribution in surface and depth profiles of the Southern sector of the Indian Ocean and coastal Antarctic waters |
| Authors | Krushna Vudamala*, Asif Qureshi, Paromita Chakraborty, Ramesh Chatharagadda, Anoop Kumar Tiwari |
| Organisation | CSIR-National Institute of Oceanography |
| Address | CSIR-NIO Dona Paula, Goa, India Pincode: 403004 Mobile: 8806640609 E-mail: vkrishnachem@gmail.com |
| Country | India |
| Presentation | Oral |
| Abstract | Antarctica and the southern sector of the Indian Ocean are pristine environments but it is reported to be affected by inputs of deleterious persistent organic pollutants (POPs). To understand the distribution and concentrations of legacy persistent organic pollutants, 7 organochlorine pesticides (OCPs) and 16 polychlorinated biphenyls (PCBs) congeners were measured from surface and depth profile samples collected from the Southern Indian Ocean (SSIO) and the coast of Antarctica (COA), during the Southern Ocean expedition (SOE-10) in 2017. The concentrations of surface water ⿿7OCPs were ranged between 0.75⿿2.22 pg L-1, at SSIO and 0.14⿿4.59 pg L-1, at COA. The concentrations range of surface water ⿿14 I-PCBs was 1.36⿿164.7 pg L-1, at SSIO and 0.59 ⿿ 36.57 pg L-1, at COA. The depth profiles concentrations of ⿿7OCPs in COA was higher (0.42⿿28.92 pg L-1) than SSIO (0.43⿿2.08 pg L-1). Likewise, the depth profiles average concentrations of ⿿14 I-PCBs in SSIO (2.61⿿94.83 pg L-1) and COA (8.92⿿80.61 pg L-1). Among the measured POPs, congener PCB8 (27.98-158 pg L-1) from SSIO, and congeners PCB44 (0.44-10.74 pg L-1), and PCB52 (3.4-32.70 pg L-1) from COA showed higher concentrations. Results of this study support the long-range atmospheric transportation (LRAT) process to an extent and suggest four possible reasons that might be responsible for the gradient distribution of POPs in SSIO and COA stations. The concentrations of POPs in SSIO and COA were found below the acute hazardous levels, indicating ecologically safe levels of POPs in current conditions in Antarctica. |