Coastal paddies could emerge as hotspots of arsenic accumulation in rice: A perspective from the Red River Delta

Nguyen, Minh N.; Tran, Tien Minh; Dang, Quan T.; Dinh, Van M.

doi:10.1016/j.apgeochem.2022.105330

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Three hotspots of metal accumulation in the top 20 cm soil were observed in the spatial distributions of heavy metals in the Yellow River Delta, and the trend in 40-50 cm soil was in accordance with the variations in hydrological conditions (Zhao et al, 2021). Nguyen et al (2022) drew a spatial distribution map of the presence of As in the Red River Delta. This spatial distribution figure showed that the coastal area appeared as a hotpot of As, with saltwater intrusion as the main influencing factor.…”

Section: Introductionmentioning

confidence: 79%

“…Furthermore, the concentration of As was shown to be lower in the RP and the P. australis wetland, largely due to the lower salinity being able to enhance the plant uptake of metals in freshwater wetlands (Fritioff et al, 2005;Bai et al, 2016). As shown by Nguyen et al (2022), rice is an As-accumulating plant species that can inadvertently assimilate As when it takes up phosphorus and silicon. In contrast to other food crops, the uptake of As in rice has been found to be substantially higher because of the prevalence of highly mobile and toxic arsenite [As (III)] under paddy soil conditions (Hussain et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…In delta areas, S plays a vital role in the concentrations of metals (Du Laing et al, 2008;Nguyen et al, 2022). Metals easily settle as metal sulfide, especially with frequent flooding and drying (Yan et al, 2021).…”

Section: Effect Of Ec and Nutrient Elementsmentioning

confidence: 99%

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Characteristics and influencing factors of metal distribution in different wetlands of the Liaohe Delta, Northeastern China

Zhang

Qin

et al. 2022

Front. Mar. Sci.

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Metal distribution in different wetlands under the complex influence of natural and anthropogenic activities in the Liaohe Delta was analyzed to better protect and manage delta areas. Ninety-six soil samples were collected from six wetland types, and the levels, depth distributions, risk, and influencing factors of metals (i.e., As, Cd, Cr, Ni, Cu, Pb, Zn, Mn, Al, and Fe) were analyzed. The results showed that the concentrations of As, Cd, Cr, Ni, Zn, and Al in more than 70% of the soil samples were higher than the background value of Liaoning Province. The concentration of As decreased with distance from the estuary, while that of Cr was higher downstream of Liaohe. The spatial distributions of Cd, Ni, Cu, Pb, and Zn were similar. The concentrations of most metals in the topsoil were higher than those in the subsoil. According to the Nemerow pollution index, higher pollution was observed in the area far away from the Liaohe River and Bohai Sea for the topsoil layer, while for the subsoil layers, higher pollution was observed in the area near the Liaohe estuary. The correlation analysis showed that the wetland type was clearly correlated with Cd, Cu, Al, and S. The concentrations of Cd, Pb, Zn, C, N, P, and S and the electrical conductivity obviously decreased with soil depth, while the concentration of Mn was positively correlated with soil depth. Mn was negatively correlated with total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP), whereas Cd, Pb, and Zn showed positive correlation with TOC, TN, and total sulfur (TS). The general linear model indicated that wetland type had a significant effect on As, Cd, Ni, Cu, Pb, Zn, Al, and Fe (p< 0.01), while depth had a significant effect on Cd, Cr, and Pb (p< 0.01). The findings of this work will contribute to pollution control and ecosystem health conservation of the Liaohe Delta.

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Section: Introductionmentioning

confidence: 79%