A national-scale characterization of organochlorine pesticides (OCPs) in intertidal sediment of China: Occurrence, fate and influential factors

Abstract

Organochlorine pesticides (OCPs) have been restricted for application for about 30 years in China. Intertidal zone is a sink for anthropogenic pollutants, and to better understand the current pollution status of OCPs in China, 324 surface sediment samples collected from 14 typical intertidal zones of China were analyzed for 22 OCPs. The total concentrations of OCPs ranged from 0.051 to 4141.711 ng/g, with DDTs and HCHs being the dominant components. Seasonal variations were not significant for most intertidal zones (p > 0.05), while significant spatial variations (p < 0.05) were found among 14 intertidal zones, with the highest OCPs concentrations detected in Jiulong Jiang (JLJ). The OCPs concentrations in intertidal sediments would rarely to frequently cause adverse biological effects and DDTs were the major threat. Apart from the historical usage of technical DDT and lindane, current usage of technical DDT and HCH were also implied, especially for intertidal zones such as Beidaihe (BDH) and Yingluo Wan (YLW). PCA analysis indicated that compounds within the same type of OCPs were from similar source, while different types of OCPs were generally from different sources and not used together. Our results further indicated that OCPs together with organic particles entered into the intertidal zones mainly through river input.

Seasonal Distributions, and Risk Assessment of Polychlorinated Biphenyls (PCBs) in the Surficial Sediments from the Turag River, Dhaka, Bangladesh

“…Whereas, the comparison of the mean PCBs concentration in sediments of Post-monsoon with other studies showed that the ∑PCBs concentration of this study was significantly lower than those reported from Makelele, Kalamu, and Nsanga, Congo (Kilunga et al 2017); River Ravi, Pakistan (Baqar et al 2017); Liaohe River, China (Lv et al 2020); CauBay River, Vietnam (Toan and Quy 2015); Sarno River, Italy (Montuori et al 2014); Soan River, Pakistan (Malik et al 2014); and River Chenab, Pakistan (Eqani et al 2012). However, the ∑PCBs concentration was slightly lower or somewhat comparable to those studies recorded from River Thames, England (Lu et al 2017); Yamuna River, India (Kumar et al 2013); Songhua River, China (Cui et al 2016) and Bahlui River, Romania (Neamtu et al 2009).…”

Ecological risk assessment of persistent organic pollutants (POPs) in surface sediments from aquaculture system

“…In the present study, we found a positive correlation between concentrations of OCPs and TOC (R 2 ¼ 0.77). A similar tendency was reported by (Huo et al, 2017) in Lake Chaohu sediments, China and (Lv et al, 2020) in 14 typical intertidal zones of China. The average of TOC in the studied sediments of the shrimp ponds (1.9 ± 1.8%) was in medium level, that is lower to those coastal waters around intensive shrimp ponds in Lampung province, Indonesia (ranged between 0.30 and 9.85%, average 3.09%) and much lower to those from the 5-year-old shrimp culture ponds in the Shanyutan wetland of Min River estuary, South-east China (22.4 ± 2.0%) (Gao et al, 2019); comparable to those Cua Hoi Estuary (average 1.72%) and Han River Estuary (average 1.78%) in coastal area of central Vietnam (Tham et al, 2019).…”

Seasonal distributions and risk assessment of polychlorinated biphenyls (PCBs) in the surficial sediments from the Turag River, Dhaka, Bangladesh

“…Three ranges of SQGQ were categorized based on potential adverse biological effects of sediment contamination. They are: no biological effects (SQGQ < 0.1), moderate biological effects (0.1 ≤ SQGQ < 1), and high biological effects (SQGQ ≥ 1) (Tian et al 2013;Wang et al 2019;Lv et al 2020).…”