Arsenic contents and physicochemical properties of agricultural soils from the Red River Delta, Vietnam

Phương, Nguyễn Minh; Kang, Youngnam; Sakurai, Katsutoshi; Iwasaki, Katsurô; Kien, Chu Ngoc; Noi, Nguyen Van; Sơn, Lê Thanh

doi:10.1111/j.1747-0765.2008.00312.x

Cited by 26 publications

(9 citation statements)

References 24 publications

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“…Bore core sediments were extracted with 1 M HCl over 30 min to determine HCl-extractable As. Physicochemical properties of the bore core sediments including particle size distribution, total carbon (TC), total nitrogen (TN), dithionite-citrate-bicarbonate (DCB)-extractable and ammonium oxalate-extractable Fe oxides and hydroxides (Fe d and Fe o , respectively) were examined by the methods described by Phuong et al (2008).…”

Section: Sedimentmentioning

confidence: 99%

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam

Phương

Kang

Sakurai

et al. 2011

Environ Monit Assess

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This study investigated the arsenic (As) level in groundwater, and the characteristics of aquifer sediment as related to the occurrence of As in groundwater in Hanam, Vietnam. The deposition and transport of As-containing substances through rivers were also examined. Arsenic concentrations in 88% of the groundwater samples exceeded the As limit for drinking water based on the WHO standards. The dominating form of arsenic was As(III). The maximum total As content in bore core sediment was found in a peat horizon of the profiles and generally, elevated levels of As were also found in other organic matter-rich horizons. Total As contents of the bore core sediments were significantly correlated with crystalline iron oxide, silt and clay contents, suggesting that As in aquifer sediment was mainly associated with iron (hydr)oxides and clay mineral. In the groundwater, As concentration showed significant correlations with the total concentrations of Fe and HCO (3)(-). Significant correlations between HCl-extractable As and non-crystalline Fe oxide, total C, N, and S were also observed in the profiles. The results support the hypothesis that under favorable reductive conditions established by the degradation of organic matter, the dissolution of iron (hydr)oxides releases adsorbed As into the groundwater. The deposition of As in the sediments from the Red River were significantly higher than that in the Chau Giang River, suggesting that the Red River is the main source of As-containing substances deposited in the study area.

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Section: Sedimentmentioning

confidence: 99%

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam

Phương

Kang

Sakurai

et al. 2011

Environ Monit Assess

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“…Sequences belonging to the classes Alpha-and Gammaproteobacteria rarely occurred at this site (<3 %). Overall, sequences of this core were closely related to ubiquitous microorganisms previously recovered from marine or terrestrial environments contaminated with heavy metals (Selenska-Pobell et al, 2001;Akob et al, 2007;Bruun et al, 2010;Kampe et al, 2010), from soil (Phuong et al, 2008;Schouten et al, 2010), water, groundwater (Sahl et al, 2008) and petroleum crude oil samples (Yamane et al, 2008). Bacterial communities of the Ligurian Sea core KESC9-30 were composed of Proteobacteria (classes Alpha-, Beta-and Gammaproteobacteria), Chloroflexi, Bacteroidetes and candidate division OP8.…”

Section: Bacterial Communitiesmentioning

confidence: 99%

Sedimentological imprint on subseafloor microbial communities in Western Mediterranean Sea Quaternary sediments

et al. 2012

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Abstract. An interdisciplinary study was conducted to evaluate the relationship between geological and paleoenvironmental parameters and the bacterial and archaeal community structure of two contrasting subseafloor sites in the Western Mediterranean Sea (Ligurian Sea and Gulf of Lion). Both depositional environments in this area are well-documented from paleoclimatic and paleooceanographic point of views. Available data sets allowed us to calibrate the investigated cores with reference and dated cores previously collected in the same area, and notably correlated to Quaternary climate variations. DNA-based fingerprints showed that the archaeal diversity was composed by one group, Miscellaneous Crenarchaeotic Group (MCG), within the Gulf of Lion sediments and of nine different lineages (dominated by MCG, South African Gold Mine Euryarchaeotal Group (SAGMEG) and Halobacteria) within the Ligurian Sea sediments. Bacterial molecular diversity at both sites revealed mostly the presence of the classes Alphaproteobacteria, Betaproteobacteria and Gammaproteobacteria within Proteobacteria phylum, and also members of Bacteroidetes phylum. The second most abundant lineages were Actinobacteria and Firmicutes at the Gulf of Lion site and Chloroflexi at the Ligurian Sea site. Various substrates and cultivation conditions allowed us to isolate 75 strains belonging to four lineages: Alpha-, Gammaproteobacteria, Firmicutes and Actinobacteria. In molecular surveys, the Betaproteobacteria group was consistently detected in the Ligurian Sea sediments, characterized by a heterolithic facies with numerous turbidites from a deep-sea levee. Analysis of relative betaproteobacterial abundances and turbidite frequency suggested that the microbial diversity was a result of main climatic changes occurring during the last 20 ka. Statistical direct multivariate canonical correspondence analyses (CCA) showed that the availability of electron acceptors and the quality of electron donors (indicated by age) strongly influenced the community structure. In contrast, within the Gulf of Lion core, characterized by a homogeneous lithological structure of upper-slope environment, most detected groups were Bacteroidetes and, to a lesser extent, Betaproteobacteria. At both site, the detection of Betaproteobacteria coincided with increased terrestrial Published by Copernicus Publications on behalf of the European Geosciences Union. 3492M.-C. Ciobanu et al.: Sedimentological imprint on subseafloor microbial communities inputs, as confirmed by the geochemical measurements (Si, Sr, Ti and Ca). In the Gulf of Lion, geochemical parameters were also found to drive microbial community composition. Taken together, our data suggest that the palaeoenvironmental history of erosion and deposition recorded in the Western Mediterranean Sea sediments has left its imprint on the sedimentological context for microbial habitability, and then indirectly on structure and composition of the microbial communities during the late Quaternary.

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“…Organic As compounds such as dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) are potentially carcinogenic to humans (IARC, 2012). Arsenic contamination of rice and paddy fields has been reported in many Asian countries (Meharg and Rahman, 2003; Liao et al, 2005; Williams et al, 2005; Phuong et al, 2008; Zhu et al, 2008; Hsu et al, 2012), and ingestion of rice is among major routes of human exposure to As (Carbonell‐Barrachina et al, 2009; Li et al, 2011; Oguri et al, 2014). A maximum inorganic As concentration of 0.35 mg kg −1 has been adopted as a standard for husked rice by the Codex Alimentarius Commission (2016).…”

mentioning

confidence: 99%

Air‐Filled Porosity as a Key to Reducing Dissolved Arsenic and Cadmium Concentrations in Paddy Soils

et al. 2018

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Simultaneous suppression of rice ( L.) uptake of As and Cd is challenging because these toxic elements are immobilized under contrasting redox conditions. Given the notion that oxygen diffusion governs redox conditions in temporarily drained paddy soil, we assume that the key to simultaneous suppression of dissolved As and Cd concentrations is air-filled porosity (AFP) of soil. The objectives of this study were to reveal relationships between AFP and dissolved As and Cd concentrations in paddy soils and to identify the optimum water management, in terms of AFP, for simultaneous reduction of As and Cd. Dissolved As and Cd concentrations were determined in soil cores collected at different depths and times during rice growing seasons. Dissolved As concentrations were appreciable (>3 µg L) only when AFP was below a threshold value of 0.04 to 0.10 m m, suggesting that dissolved As was rapidly immobilized once AFP exceeded the threshold value on drainage. Dissolved Cd concentrations were roughly proportional to AFP, with higher concentrations associated with lower soil pH. Although dissolved As concentrations tended to be low in soil samples with high dissolved Cd concentrations and vice versa, both concentrations were low when AFP was slightly above the threshold value for As immobilization. The results suggest that dissolved As and Cd can be simultaneously kept at low levels by appropriate water management practices that produce AFP slightly above the threshold value for As immobilization.

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Arsenic contents and physicochemical properties of agricultural soils from the Red River Delta, Vietnam

Cited by 26 publications

References 24 publications

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam

Arsenic contamination in groundwater and its possible sources in Hanam, Vietnam

Sedimentological imprint on subseafloor microbial communities in Western Mediterranean Sea Quaternary sediments

Air‐Filled Porosity as a Key to Reducing Dissolved Arsenic and Cadmium Concentrations in Paddy Soils

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