Seasonal disparity in the co-occurrence of arsenic and fluoride in the aquifers of the Brahmaputra flood plains, Northeast India

Das, Nani Gopal; Sarma, Kamal; Patel, Arbind Kumar; Deka, Jyoti Prakash; Das, Aparna; Kumar, Abhay; Shea, Patrick J.; Kumar, Manish

doi:10.1007/s12665-017-6488-x

Cited by 48 publications

(8 citation statements)

References 28 publications

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“…The north-east states of India are also reported to be contaminated with elevated As content. The significant presence of elemental contamination including As in the ground waters of the Brahmaputra floodplain, spanning across Assam (Lakhimpur and Diphu), Manipur (Kakching, Imphal East, Imphal West, and Bishnupur), Meghalaya, Mizoram, Nagaland, and Tripura further extended to Arunachal Pradesh, has also been confirmed by several earlier findings [ 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ]. Thus, it will be necessary to assess the phytotoxicity of As on the popular rice varieties among the farmers of north-east India and this will be helpful in proposing a suitable mitigation (to minimize the As toxicity) plan for the region.…”

Section: Discussionsupporting

confidence: 62%

An In Vitro and In Silico Perspective Study of Seed Priming with Zinc on the Phytotoxicity and Accumulation Pattern of Arsenic in Rice Seedlings

et al. 2022

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Arsenic (As) contamination of the rice agro-ecosystem is a major concern for rice farmers of South East Asia as it imposes a serious threat to human and animal life; thus, there is an unrelenting need to explore the ways by which arsenic stress mitigation could be achieved. In the present investigation, we explore the effect of zinc (Zn2+) supplementation using the seed priming technique for the mitigation of As-induced stress responses in developing rice seedlings. In addition to the physiological and biochemical attributes, we also studied the interactive effect of Zn2+ in regulating As-induced changes by targeting antioxidant enzymes using a computational approach. Our findings suggest that Zn2+ and As can effectively modulate redox homeostasis by limiting ROS production and thereby confer protection against oxidative stress. The results also show that As had a significant impact on seedling growth, which was restored by Zn2+ and also minimized the As uptake. A remarkable outcome of the present investigation is that the varietal difference was significant in determining the efficacy of the Zn2+ priming. Further, based on the findings of computational studies, we observed differences in the surface overlap of the antioxidant target enzymes of rice, indicating that the Zn2+ might have foiled the interaction of As with the enzymes. This is undoubtedly a fascinating approach that interprets the mode of action of the antioxidative enzymes under the metal/metalloid-tempted stress condition in rice by pointing at designated targets. The results of the current investigation are rationally significant and may be the pioneering beginning of an exciting and useful method of integrating physiological and biochemical analysis together with a computational modelling approach for evaluating the stress modulating effects of Zn2+ seed priming on As-induced responses in developing rice seedlings.

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Section: Discussionsupporting

confidence: 62%

An In Vitro and In Silico Perspective Study of Seed Priming with Zinc on the Phytotoxicity and Accumulation Pattern of Arsenic in Rice Seedlings

et al. 2022

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“…Pollution by nitrate is a matter of high concern as it can negatively affect ecosystems [73]. NO3 − ion is a familiar pollutant in water [74]. The maximum value was obtained at F-6 at 153.44 mg/L and the lowest of 0.2 mg/L at F-12, with an average value of 37.13 mg/L in the groundwater of the study area (Table 1).…”

Section: Discussionmentioning

confidence: 91%

Chemometrics of the Environment: Hydrochemical Characterization of Groundwater in Lioua plain (North Africa) using Time Series and Multivariate Statistical Analysis

Athamena¹,

Gaagai²,

Aouissi³

et al. 2022

Preprint

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Drinking water quality is a major concern, especially in African countries. This manuscript aims to analyze the chemical composition of Lioua’s groundwater in order to determine the geological processes influencing the chemical elements' composition and origin. Therefore, chemometrics techniques such as multivariate statistical analysis (MSA) and time series methods (TSM) are used. Indeed, MSA includes a component analysis (PCA) and a cluster analysis (CA), while au-tocorrelation analysis (AA) supplemented by simple spectral density analysis (SDA) is used for TMS. PCA displays three main factors explaining a total variance (TV) of 85.01 %. Factors 1, 2, and 3 are 68.72%, 11.96%, and 8.89 % of TV, respectively. In the CA, three groups were controlled by TDS and EC. G1 reveals a close association between SO42−, K+, Ca2+, and TDS; G2 reveals a close association between Na+, Cl−, Mg2+, and EC; G3 shows the dissociation of bicarbonates HCO3− and NO3− from other chemical elements. AA shows a linear interrelationship of EC, Mg2+, Na+, K+, Cl−, and SO42−. However, NO3− and HCO3− indicate uncorrelated characteristics with other parameters. For SDA, the correlograms of Mg2+, Na+, K+, Cl−, and SO42− have a similar trend with EC. None-theless, pH, Ca2+, HCO3− and NO3− exhibit multiple peaks related to the presence of several dis-tinct cyclic mechanisms. The methods enabled the authors to conclude that the geochemical processes influencing the chemical composition are: (i) dissolution of evaporated mineral depos-its, (ii) water-rock interaction, and (iii) evaporation process. In addition, Groundwater exhibits two bipolar characteristics, one recorded with negative and positive charges on pH and Ca+ and another recorded only with negative charges on HCO3− and NO3−. On the other hand, SO42-, K+, Ca2+, and TDS are the major predominant elements in the groundwater’s chemical composition. The major participation of salts and chlorides is in the electrical conductivity of water. The dominance of the lithological factor in the overall mineralization of the Plio-Quaternary surface aquifer waters. The origins of HCO3− and NO3− are different. Indeed, carbonated for HCO3- has a carbonate origin, whereas NO3– has an anthropogenic origin. The salinity was affected by Mg2+, SO42-, Cl-, Na+, K+, and EC. Ca2+, HCO3− and NO3− are resulted from human activity fertilizers, the carbonate facies outcrops, and domestic sewage.

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“…The regression in Fig 4 describes the increase in arsenic concentration when a specific, common, and powerful oxidizing agent, dissolved oxygen, is relatively absent ( Fig 4 ). The relative absence of dissolved oxygen and the consequent release of arsenic into drinking well water is very likely caused by the seasonal and episodic flooding in the Bengal Delta Plain (Bangladesh and Northeast India), as suggested by the maps of dissolved oxygen concentration and arsenic concentration (Figs 2 and 3 ) [ 8 , 20 , 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…The regression in Fig 6 describes the increase in arsenic concentration in a reducing environment ( Fig 6 ). This reducing environment and release of arsenic into drinking well water is very likely caused by the seasonal flooding in Bangladesh, as suggested by the maps of oxidation-reduction potential and arsenic concentration (Figs 2 and 5 ) [ 8 , 20 , 25 ]. In conclusion, as the climate changes and sea levels rise and flooding increases, the release of arsenic into Bangladesh’s drinking well water by reduction is expected to increase.…”

Section: Resultsmentioning

confidence: 99%

Sea level rise from climate change is expected to increase the release of arsenic into Bangladesh’s drinking well water by reduction and by the salt effect

Frisbie,

Mitchell,

Molla

2024

PLoS ONE

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Background Over 165,000,000 people live in Bangladesh; approximately 97% of Bangladeshis drink well water. Approximately 49% of Bangladesh’s area has drinking well water with arsenic (As) concentrations that exceed the 10 micrograms per liter (μg/L) World Health Organization (WHO) guideline. This exposure to a potent carcinogen is a significant threat to public health. About 21% of Bangladesh is flooded each year during a typical monsoon season. As climate change progresses, sea levels will continue to rise, and the area and duration of these annual floods will increase. We hypothesize that these consequences of climate change can increase the release of arsenic from sediments into Bangladesh’s drinking well water. Methods Drinking well water samples were collected during a national-scale survey in Bangladesh. The dissolved oxygen concentration, oxidation-reduction potential, specific conductance, pH, and temperature were measured at sampling with calibrated portable electronic sensors. The arsenic concentration was measured by the silver diethyldithiocarbamate method. Results As the concentration of dissolved oxygen decreases, the concentration of arsenic increases (p-value = 0.0028). Relatedly, as the oxidation-reduction potential decreases, the concentration of arsenic increases (p-value = 1.3×10−5). This suggests that arsenic is released from sediments into Bangladesh’s drinking well drinking water by reduction. As the specific conductance increases, the concentration of arsenic increases (p-value = 0.023). This suggests that arsenic is also released from sediments into water by the salt effect. Conclusions Rising sea levels can cause a decrease in the dissolved oxygen concentration and oxidation-reduction potential of the underlying aquifer; this should increase the dissolution of insoluble arsenate (H3−xAs(V)O4x−) in sediments by reduction. This, in turn, should release soluble arsenite (H3−xAs(III)O3x−) into the drinking well water. Rising sea levels can cause an increase in the salt concentration of the underlying aquifer; this should increase the release of arsenic from sediments into the drinking well water by the salt effect.

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Seasonal disparity in the co-occurrence of arsenic and fluoride in the aquifers of the Brahmaputra flood plains, Northeast India

Cited by 48 publications

References 28 publications

An In Vitro and In Silico Perspective Study of Seed Priming with Zinc on the Phytotoxicity and Accumulation Pattern of Arsenic in Rice Seedlings

An In Vitro and In Silico Perspective Study of Seed Priming with Zinc on the Phytotoxicity and Accumulation Pattern of Arsenic in Rice Seedlings

Chemometrics of the Environment: Hydrochemical Characterization of Groundwater in Lioua plain (North Africa) using Time Series and Multivariate Statistical Analysis

Sea level rise from climate change is expected to increase the release of arsenic into Bangladesh’s drinking well water by reduction and by the salt effect

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