Arsenic contamination of the environment

Pandey, Piyush Kant; Yadav, Sushma; Nair, Sumita; Bhui, Ashish

doi:10.1016/s0160-4120(02)00022-3

Cited by 65 publications

(10 citation statements)

References 6 publications

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“…Toxic effects of these heavy metals include inhibition of cytoplasmic enzymes and damage to cell structures due to oxidative stress (Van Assche and Clijsters, 1990; Asati et al, 2016). Groundwater contaminations with As have been reported in many countries such as Argentina, Bangladesh, Chile, China, India, Japan, Mexico, Mongolia, Nepal, Poland, Taiwan, Vietnam, and United States (Chowdhury et al, 2000; Smith et al, 2000; Anawar et al, 2002; Pandey et al, 2002). However, in the Ganges Delta region of Bangladesh and West Bengal, As in groundwater has emerged as the largest environmental health disaster (Rahman et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Arbuscular Mycorrhiza Augments Arsenic Tolerance in Wheat (Triticum aestivum L.) by Strengthening Antioxidant Defense System and Thiol Metabolism

et al. 2017

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Arbuscular mycorrhiza (AM) can help plants to tolerate arsenic (As) toxicity. However, plant responses are found to vary with the host plant and the AM fungal species. The present study compares the efficacy of two AM fungi Rhizoglomus intraradices (M1) and Glomus etunicatum (M2) in amelioration of As stress in wheat (Triticum aestivum L. var. HD-2967). Mycorrhizal (M) and non-mycorrhizal (NM) wheat plants were subjected to four levels of As (0, 25, 50, and 100 mg As kg-1 soil). Although As additions had variable effects on the percentage of root colonized by the two fungal inoculants, each mycobiont conferred benefits to the host plant. Mycorrhizal plants continued to display better growth than NM plants. Formation of AM helped the host plant to overcome As-induced P deficiency and maintained favorable P:As ratio. Inoculation of AMF had variable effects on the distribution of As in plant tissues. While As translocation factor decreased in low As (25 mg kg-1 soil), it increased under high As (50 and 100 mg As kg-1 soil). Further As translocation to grain was reduced (As grain:shoot ratio) in M plants compared with NM plants. Arsenic-induced oxidative stress (generation of H2O2 and lipid peroxidation) in plants reduced significantly by AMF inoculation. The alleviation potential of AM was more evident with increase in severity of As stress. Colonization of AMF resulted in higher activities of the antioxidant enzymes (superoxide dismutase, catalase, and guaiacol peroxidase). It increased the concentrations of the antioxidant molecules (carotenoids, proline, and α-tocopherol) than their NM counterparts at high As addition level. Comparatively higher activities of enzymes of glutathione-ascorbate cycle in M plants led to higher ascorbate:dehydroascorbate (AsA:DHA) and glutathione:glutathione disulphide (GSH:GSSG) ratios. Inoculation by AMF also augmented the glyoxalase system by increasing the activities of both glyoxalase I and glyoxalase II enzymes. Mycorrhizal colonization increased concentrations of cysteine, glutathione, non-protein thiols, and activity of glutathione-S-transferase that facilitated sequestration of As into non-toxic complexes. The study reveals multifarious role of AMF in alleviation of As toxicity.

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Section: Introductionmentioning

confidence: 99%

Arbuscular Mycorrhiza Augments Arsenic Tolerance in Wheat (Triticum aestivum L.) by Strengthening Antioxidant Defense System and Thiol Metabolism

et al. 2017

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“…[5][6][7][8] Typical uncontaminated agricultural soils contain 1-20 mg/kg, 9 but contaminated soils in mining or industrial areas contain levels as high as 45-2600 mg/kg. 5,[10][11][12] In many cases, extensive use of As-rich groundwater has led to elevated As concentrations in agricultural soils, 13,14 which may reduce soil productivity, 15 be toxic to plants, and enter into the crops. 16,17 The bioavailable fraction of As in soils to crop plants depends on the different physical and chemical properties of soils.…”

Section: Introductionmentioning

confidence: 99%

Impact of irrigation with arsenic-rich groundwater on soils and crops

et al. 2009

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The study was carried out in an intensively cultivated agricultural area of central Spain where high arsenic (As) concentrations in groundwater were previously reported. The concentrations and distribution of As in soils and crops (wheat, potato, sugar beet and carrot) were determined to know the effect of irrigation with As-rich groundwater in the agricultural fields, and to estimate its impact on the food chain contamination. Irrigation water shows high As concentrations ranging between 38 and 136 microg/l. Total As contents in the studied agricultural soils are higher than 10 mg/kg exceeding the As content in two control areas and the results of this study reflect that irrigation with As-rich groundwater led to the elevated As levels in the agricultural soils. Total As concentration in soils of a sugar beet plot (36 mg/kg) is higher than that found in soils of the less intensively watered field (11 mg/kg), and more than 3.5 times higher than that in the soils of the control area irrigated with uncontaminated water (<10 mg/kg). Water soluble As in soils ranges between 0.03 and 0.9 mg/kg exceeding the limit of 0.04 mg/kg for agricultural use and shows a significant correlation with total As and organic matter (OM) content in soils. Arsenic contents in potato tuber samples are 35 times higher than that measured in potato tuber of uncontaminated control sites (0.03 mg/kg). Elevated As contents (3.9-5.4 mg/kg DW) were also found in root samples of sugar beet. The As contents in vegetable samples are higher than As content (0.1 mg/kg DW) in plants of uncontaminated control areas, and the limits for foodstuffs (0.5-1 mg/kg DW) set by legislation of many countries reflecting the risk of food chain contamination by As in this study area.

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“…Pollution of ground and surface waters with arsenic signifies a crucial environmental problem owing to its lethal impacts, non‐biodegradability and accumulation in the food chain . Due to this, several environmental agencies pose severe regulation to arsenic.…”

Section: Introductionmentioning

confidence: 99%

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

et al. 2020

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The ability of Turbinaria ornata seaweed derived biochar (TOB) to remove arsenate ions from polluted solutions in batch and column trials has been investigated. The biochar, produced at 300 °C and 120 min through pyrolysis, exhibited maximum arsenate sorption capacity at pH 4. Batch sorption isotherm was described with different models (Freundlich, Langmuir and Sips) and the Sips model best described the experimentally derived isotherm with high correlation coefficient and low percentage error values. The maximum arsenate sorptional capacity calculated using the Langmuir model was estimated to be 0.124 mmol/g (at pH 4; 2 g/L biochar dosage and 0.5 mmol/L initial arsenate concentration). For elution trials, 0.01 M NaOH performed well to desorb arsenate from arsenate‐bounded TOB with elution efficiency greater than 99.6% with no significant damage to TOB. The capability of TOB to sorb arsenate continuously was examined in a packed column. The continuous trials were mainly performed to evaluate the impact of influential column parameters including bed height, initial arsenate concentration and flow rate. The arsenate sorptional capacity declined with improvement in flow rate, whereas enhanced with increment in bed depth and initial arsenate concentration values. Regeneration of exhausted TOB was possible with 0.01 M NaOH. After three sorption‐elution cycles it was determined that TOB exhibited superior sorption capacities and percentage removal efficiencies.

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Arsenic contamination of the environment

Cited by 65 publications

References 6 publications

Arbuscular Mycorrhiza Augments Arsenic Tolerance in Wheat (Triticum aestivum L.) by Strengthening Antioxidant Defense System and Thiol Metabolism

Arbuscular Mycorrhiza Augments Arsenic Tolerance in Wheat (Triticum aestivum L.) by Strengthening Antioxidant Defense System and Thiol Metabolism

Impact of irrigation with arsenic-rich groundwater on soils and crops

Batch and Column Arsenate Sorption Using Turbinaria ornata Seaweed Derived Biochar: Experimental Studies and Mathematical Modeling

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