Reduction, methylation, and translocation of arsenic in Panax notoginseng grown under field conditions in arsenic-contaminated soils

Ma, Jie; YanHua, Mi; Li, Qiwan; Chen, Lu; Du, Liangcheng; Li-zhong, HE; Lei, Mei

doi:10.1016/j.scitotenv.2016.01.188

Cited by 26 publications

(10 citation statements)

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“…In this study, although As(V) adsorption on soil colloids were higher around 4e10 times than on sand (Ma et al, 2015a) and adsorbed-As(V) concentrations on soil colloids were higher than As concentrations of some As-contaminated soils (Ma et al, 2016), the adsorption was much less than on ferrous minerals (e.g., ferrihydrite, siderite, goethite, magnetite, and mixture of siderite and goethite) (Asta et al, 2009;Guo et al, 2010;Jessen et al, 2005;Liang and Zhao, 2014). Soil colloid suspensions with concentrations of 250 mg L À1 only adsorbed 8.9%, 5.7%, and 3.7%…”

Section: Influentcontrasting

confidence: 60%

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Guo

Lei

et al. 2016

Environmental Pollution

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a b s t r a c tTransport of environmental pollutants through porous media is influenced by colloids. Co-transport of As(V) and soil colloids at different pH were systematically investigated by monitoring breakthrough curves (BTCs) in saturated sand columns. A solute transport model was applied to characterize transport and retention sites of As(V) in saturated sand in the presence of soil colloids. A colloid transport model and the DLVO theory were used to reveal the mechanism and hypothesis of soil colloid-promoted As(V) transport in the columns. Results showed that rapid transport of soil colloids, regulated by pH and ionic strength, promoted As(V) transport by blocking As(V) adsorption onto sand, although soil colloids had low adsorption for As(V). The promoted transport was more significant at higher concentrations of soil colloids (between 25 mg L À1 and 150 mg L À1) due to greater blocking effect on As(V) adsorption onto the sand surfaces. The blocking effect of colloids was explained by the decreases in both instantaneous (equilibrium) As adsorption and first-order kinetic As adsorption on the sand surface sites. The discovery of this blocking effect improves our understanding of colloid-promoted As transport in saturated porous media, which provides new insights into role of colloids, especially colloids with low As adsorption capacity, in As transport and mobilization in soil-groundwater systems.

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Section: Influentcontrasting

confidence: 60%

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Guo

Lei

et al. 2016

Environmental Pollution

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“…Some previous studies in Wenshan Zhuang and Miao Autonomous Prefecture demonstrated that As pollution contribution rate was 52.1%, integrated pollution index was 0.67, close to cordon (Li, 2004), and As concentrations in P. (Yan et al, 2012). Our study has found arsenate (As(V)) was almost exclusively identified in the soil, while be absorbed of arsenite (As (V)) can occur reduction and methylation in high proportions in P. notoginseng tissues (Ma et al, 2016). But we do not know clearly the distribution of arsenic in P. notoginseng tissue.…”

Section: Introductionsupporting

confidence: 61%

“…Wenshan Zhuang and Miao Autonomous Prefecture of China was origin country, in which P. notoginseng has planted more than 400 years, and accounts for 98% of the total production in China (Wang et al, 2004;Guo et al, 2010). However, arsenic (As) concentrations in the soils of this production area are elevated due to high background levels, frequent mining activities, and the large-scale use of As based pesticides and fertilizers (Ma, 2016).…”

Section: Introductionmentioning

confidence: 99%

Application of Synchrotron Radiation X-Ray Fluorescence to Investigate the Distribution of Arsenic in Different Organs of Panax Notoginseng

Chen¹

2017

Appl Ecol Env Res

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Chen et al.: μ-SRXRF of arsenic in Panax notoginsengAbstract. This study investigated the micro area of cell tissue through synchrotron radiation X-ray fluorescence and high-performance liquid chromatography-atomic fluorescence spectrometry to indicate the effect of exogenous phosphorus (P) on the distribution of arsenic (As) absorption and the formation of As content in Panax notoginseng. Results showed that distributions of relative contents of As and P are the same in roots of P. notoginseng. Treatment with As50mg/l+P100mg/l resulted in the decrease of As content in P. notoginseng. From stems and leaves of arsenic fluorescence distribution can be seen that arsenic into P. notoginseng plant and part of the trend of the transport to the ground, therefore rise to arsenic in the blade also is relatively small, mainly concentrated in the stem. Exogenous P treatment can effectively reduce the root's absorption and accumulation of As, thereby reducing the harmful effect of As on P. notoginseng.

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“…Again, there is an analogy with findings of methylated As in plants. Small amounts of methlylated As were found in plants collected from various field sites (Hansen et al, 2011 ; Ma et al, 2016 ). Sunflower ( Helianthus annuus ) plants grown in As(III) solution showed small concentrations of both MA and DMA, although they were difficult to quantify (Raab et al, 2005 ).…”

Section: Discussionmentioning

confidence: 99%

“…While there is a lack of knowledge about the interactions between methylated Sb and plants, investigations of the uptake and turnover of methylated As by plants may give some hints, based on the fact that Sb and As are sister elements in the periodic table and similar in many chemical characteristics. Zhao et al ( 2013 ) found inorganic As, monomethylarsinic V acid (MMA) and dimethylarsinic V acid (DMA) to be the dominant As species in paddy-grown rice, while (Ma et al, 2016 ) found that the main species in Panax notoginseng collected from the field were As(III) and MMA, although the main species in the soils was arsenate (As(V)). Given that TMSb was found to be more mobile than methylated arsenate in soils (Yang and He, 2015 ), transfer of methylated species from soils into plants may also be a relevant process for Sb in soil under low-redox conditions.…”

Section: Introductionmentioning

confidence: 99%

Uptake and Transformation of Methylated and Inorganic Antimony in Plants

Mestrot

Schulin

et al. 2018

Front. Plant Sci.

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Used as a hardening agent in lead bullets, antimony (Sb) has become a major contaminant in shooting range soils of some countries including Switzerland. Soil contamination by Sb is also an environmental problem in countries with Sb-mining activities such as China and Bolivia. Because of its toxicity and relatively high mobility, there is concern over the risk of Sb transfer from contaminated soils into plants, and thus into the food chain. In particular there is very little information on the environmental behavior of methylated antimony, which can be produced by microbial biomethylation of inorganic Sb in contaminated soils. Using a new extraction and high-performance liquid chromatography inductively coupled plasma mass spectrometry (HPLC-ICP-MS) method, we investigated antimony speciation in roots and shoots of wheat, fescue, rye, and ryegrass plants exposed to trimethyl antimony(V) (TMSb), antimonite (Sb(III)), and antimonate (Sb(V)) in hydroponics. The total root Sb concentrations followed the order Sb(III) treatment > Sb(V) treatment > TMSb treatment, except for fescue. Shoot Sb concentrations, however, did not differ among the three treatments. In the Sb(V) treatment small quantities of TMSb were found in the roots, whereas no TMSb was detected in the roots of Sb(III)-treated plants. In contrast, similar concentrations of TMSb were found in the shoots in both inorganic Sb treatments. The results indicate that biomethylation of Sb may occur in plants. In the TMSb treatment TMSb was the major Sb species, but the two inorganic Sb species were also found both in shoots and roots along with some unknown Sb species, suggesting that also TMSb demethylation may occur within plant tissues. The results furthermore indicate that methylated Sb is more mobile in plants than inorganic Sb species. Knowledge about this is important in risk assessments of Sb-contaminated sites, as methylation may render Sb more toxic than inorganic Sb, as it is known for arsenic (As).

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Reduction, methylation, and translocation of arsenic in Panax notoginseng grown under field conditions in arsenic-contaminated soils

Cited by 26 publications

References 50 publications

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Blocking effect of colloids on arsenate adsorption during co-transport through saturated sand columns

Application of Synchrotron Radiation X-Ray Fluorescence to Investigate the Distribution of Arsenic in Different Organs of Panax Notoginseng

Uptake and Transformation of Methylated and Inorganic Antimony in Plants

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