Fractionation and speciation of arsenic in three tea gardens soil profiles and distribution of As in different parts of tea plant (Camellia sinensis L.) (original) (raw)
Arsenic In The Soil Environment : A Soil Chemistry Review
2016
Arsenic in the soil environment has gained renewed interest because of the emerging acknowledgement that arsenic accumulation in rice is a global concern. This review reflects the current state of research being provided to the understanding of arsenic in the soil environment with an emphasis on arsenic uptake in rice. Arsenic speciation and the chemical reactions associated with arsenite, arsenate and methylated-arsenic species is of prime importance. The chemistry of soil arsenic is both abiotic and biotic and its chemistry is complicated by (i) oxidation-reduction processes, (ii) acid-base reactions, (iii) adsorption-precipitation reactions, and (iv) plant uptake and accumulation. Ultimately plant genetics and emerging irrigation regimes, predicated on our collective understanding of the role soil chemistry, provide the opportunity to alter agriculture production to safeguard the global food
Microchimica Acta, 2005
This paper describes an approach to the determination of arsenic species bonding with proteins or low-molecular peptides by separation of leaf proteins and protein precursors into three fractions and analysis of arsenic species associated to these fractions. Plants irrigated with arsenite contained not only arsenite but also arsenate and dimethylarsinate. In plants treated with arsenate, the major component was arsenite in the water-soluble fraction containing soluble protein and non-protein (F II) and in the acid-soluble non-protein fraction (F IV). Concentrations of 43 mg kg À1 (As(V)-treatment) and 18 mg kg À1 (As(III)-treatment) could be analyzed in the waterinsoluble structure protein fraction F I (56 AE 15% of the total mass). Based on the concentration of arsenic species in all fractions, conclusions are drawn over the fixation of arsenic in the fraction of insoluble structure proteins, in the fraction of soluble cytosolic proteins as well as the fraction of amino acids.
A profile of arsenic species in different vegetables growing in arsenic-contaminated soils
Archives of Agronomy and Soil Science, 2016
Six different vegetables (black radish, black salsify, lettuce, parsnip, Savoy cabbage and Swede turnip) were cultivated in model pot experiments. The soils used in the experiments originated from two mining and smelting sites in the Czech Republic-Příbram and Kutná Hora, respectively. These soils showed differences in physicochemical properties and/or total contents of arsenic, reaching 36.0±1.0 mg As kg-1 and 473 ± 10 mg As kg-1 , respectively. The four most common anionic arsenic compounds (arsenite As(III), arsenate As(V), dimethylarsinate (DMA), methylarsonate (MA)) were determined by high-performance liquid chromatography (HPLC) coupled to an inductively coupled plasma mass spectrometer (ICPMS). The concentration of arsenic species determined in edible plant parts decreased in the following order: As(V) ~ As(III) >> DMA ~ MA. Higher proportions of both DMA and MA were found in the aboveground edible parts (leaves) compared to the underground parts (tubers). The results indicate that the distribution of arsenic compounds differed predominantly according to individual plant species whereas almost no effect was observed due to the different soil properties. However, a higher arsenic concentration in soils resulted in more arsenic in the plant independently of the aboveground biomass (leaves) or the underground plant parts (tubers).
Phytochemistry, 2009
This study investigated the absorption of arsenic (As), sulfur (S), and phosphorus (P) in the desert plant Chilopsis linearis (Desert willow). A comparison between an inbred line (red flowered) and wild type (white flowered) plants was performed to look for differential responses to As treatment. One month old seedlings were treated for 7 days with arsenate (As 2 O 5 , As V ) at 0, 20, and 40 mg As V L À1 . Results from the ICP-OES analysis showed that at 20 mg As V L À1 , red flowered plants had 280 ± 11 and 98 ± 7 mg As kg À1 dry wt in roots and stems, respectively, while white flowered plants had 196 ± 30 and 103 ± 13 mg As kg À1 dry wt for roots and stems. At this treatment level, the concentration of As in leaves was below detection limits for both plants. In red flowered plants treated with 40 mg As V L À1 , As was at 290 ± 77 and 151 ± 60 mg As kg À1 in roots and stems, respectively, and not detected in leaves, whereas white flowered plants had 406 ± 36, 213 ± 12, and 177 ± 40 mg As kg À1 in roots, stems, and leaves. The concentration of S increased in all As treated plants, while the concentration of P decreased in roots and stems of both types of plants and in leaves of red flowered plants. X-ray absorption spectroscopy analyses demonstrated partial reduction of arsenate to arsenite in the form of As-(SX) 3 species in both types of plants.
Ali et al.: Arsenic In Plant-Soil Environment
Fate of Arsenic in the Environment, 2003
Arsenic in groundwater and its fate and transport in the environment have become matters of great concern in Bangladesh, India and several other countries. In Bangladesh, an estimated 268 upazillas out of 465 have been affected with significantly high concentrations of arsenic. In Bangladesh
Environmental Pollution, 2014
The toxicity of arsenic (As) in the environment is controlled by its concentration, availability and speciation. The aims of the study were to evaluate the accumulation and speciation of As in carrot, lettuce and spinach cultivated in soils with various As concentrations and to estimate the concomitant health risks associated with the consumption of the vegetables. Arsenic concentration and speciation in plant tissues and soils was analysed by HPLC, AAS and XANES spectroscopy. To estimate the plants influence in the rhizosphere, organic acids in lettuce root exudates were analysed by ion chromatography. The results showed that the As accumulation was higher in plants cultivated in soil with higher As extractability. Arsenate predominated in the soils, rhizosphere and root exudates of lettuce. Succinic acid was the major organic acid in lettuce root exudates. Ingestion of the tested vegetables may result in an intake of elevated levels of inorganic As.
EFFECTS OF ARSENIC AND THEIR MITIGATION IN PLANTS.
International Journal of Advanced Research (IJAR), 2018
Arsenic is a metalloid - a natural element that is not actually a metal but which has both the properties of a metal and a non metal. It is a natural component of the Earth?s crust, generally found in trace quantities in all rock, soil, water and air. However, concentrations may be higher in certain areas due to either natural conditions or human activities. Soil contaminants?organic like petroleum, hydro-carbon, fertilizer, pesticide, copper, nickel cobalt zinc , Inorganic like arsenic cadmium, mercury, lead,Arsenic (As) is posing a serious health concern in West Bengal in India. Long term Arsenic exposure leads to skin lesions and various types of cancers. Safe level of As in drinking water is10 μg l-1, as recommended by World Health Organization in 1993, while the level of As in ground water has been reported up to 3200 μg l-1 in West Bengal. The total daily intake should not exceed 2 mg of inorganic arsenic per kilogram of body weight .Arsenic is non-essential element for plant and present in environment both in inorganic as well as organic forms. Arsenate (AsV) and arsenite (AsIII) are predominant inorganic forms. As toxicity symptoms in plants range from inhibition of root growth, photosynthesis to death of plant Arsenate shows structural analogy with phosphate so it is mainly transported through high affinity phosphate transporters
Extraction and speciation of arsenic in plants grown on arsenic contaminated soils
Talanta, 2007
A sequential arsenic extraction method was developed that yielded extraction efficiencies (EE) that were approximately double those using current methods for terrestrial plants. The method was applied to plants from two arsenic contaminated sites and showed potential for risk assessment studies. In the method, plants were extracted first by 1:1 water-methanol followed by 0.1M hydrochloric (HCl) acid. Total arsenic in plant and soil samples collected from contaminated sites was mineralized by acid digestion and detected by inductively coupled plasma-atomic emission spectrometry (ICP-AES) and hydride generation-atomic absorption spectrometry (HG-AAS). Arsenic speciation was done by high performance liquid chromatography coupled with HG-AAS (HPLC-HGAAS) and by HPLC coupled with ICP-mass spectrometry (HPLC-ICP-MS). Spike recovery experiments with arsenite (As(III)), arsenate (As(V)), methylarsonic acid (MA) and dimethylarsinic acid (DMA) showed stability of the species in the extraction...
Arsenic in the soil environment: a review
Advances in agronomy, 1998
Copyright 0 1098 by Academic Press. All rights of rrproducnon in m y form reserved. 1106s-ziim m o o ~~~~ ~~ Total As content Noncontaminated Contaminated soil Sampling site soil (mg kg-')
Measuring the Arsenic Content and Speciation in Different Rice Tissues
BIO-PROTOCOL, 2015
Arsenic (As) plays an important role in rice production as vast soils used for rice cultivation contain As. To understand how rice plants deal with inorganic As (III) and As (V) and organic As in their tissue, it is important to obtain specific information on how much and what species of As are present in which tissue of the rice plant. The protocol presented here allows to analyse the As contents and As speciation in roots, shoots, and husks of rice plants, and thus permits direct comparison of the As contents of these rice plant tissues.