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Arsenic concentrations in local aromatic and high-yielding hybrid rice cultivars and the potential health risk: A study in an arsenic hotspot
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Department of Ecology, Environment and Plant Sciences, Stockholm University, SE 10691 Stockholm, Sweden.ORCID iD: 0000-0002-2715-2931
Department of Ecology, Environment & Plant Sciences, Stockholm University, SE-10691 Stockholm, Sweden. (Plant Metal Group)
Department of Ecology, Environment & Plant Sciences, Stockholm University, SE-10691 Stockholm, Sweden. (Plant Metal Group)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
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2017 (English)In: Environmental Monitoring & Assessment, ISSN 0167-6369, E-ISSN 1573-2959, Vol. 189, no 184Article in journal (Refereed) Accepted
Abstract [en]

The presence of high levels of arsenic (As) in rice fields has negative effects on the health ofthose consuming rice as their subsistence food. This study determined the variation in total Asconcentration in local aromatic rice (LAR) (kalijira) and two high yielding varieties (HYVs)(BRRI dhan 32 and BRRI dhan 28) grown in paddy fields in Matlab, Bangladesh, an As hotspot with elevated As levels in groundwater. Mature rice grain samples and soil samples were collected from different paddy fields and the As concentrations in both the de-husked grains and the husks of the three rice cultivars were analysed to identify the safest of the threecultivars for human consumption. The results showed that the total As concentration washigher (0.09-0.21 mg As kg-1) in the de-husked grains of LAR than in the husks, while theopposite was found for the HYV rice. Moreover, the As concentration in soil samples was 2-to 5-fold higher for the LAR than for the HYVs, but the As accumulation factor (AF) waslower in the LAR (0.2-0.4%) than in the HYVs (0.9-1%). Thus, LAR can be considered thesafest of the three cultivars for human consumption owing to its low AF value. Furthermore,due to the low AF, growing LAR instead of HYVs in soils with slightly elevated As levelscould help improve the food safety level in the food chain.

Place, publisher, year, edition, pages
Springer Publishing Company, 2017. Vol. 189, no 184
Keyword [en]
Aromatic rice, Arsenic, As uptake, Accumulation factor, Bangladesh, food chain, Husk, soil
National Category
Agricultural Science, Forestry and Fisheries Biological Sciences Inorganic Chemistry Health Sciences
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-204154DOI: 10.1007/s10661-017-5889-3OAI: oai:DiVA.org:kth-204154DiVA: diva2:1084244
Funder
Sida - Swedish International Development Cooperation Agency, Sida contribution no. 73000854, 2007–2015
Note

Qc 20170406

Available from: 2017-03-24 Created: 2017-03-24 Last updated: 2017-04-06Bibliographically approved
In thesis
1. ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
Open this publication in new window or tab >>ARSENIC REMOVAL BY PHYTOFILTRATION AND SILICON TREATMENT: A POTENTIAL SOLUTION FOR LOWERING ARSENIC CONCENTRATIONS IN FOOD CROPS
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Use of arsenic-rich groundwater for crop irrigation can increase the arsenic (As) content in food crops and act as a carcinogen, compromising human health. Using aquatic plant based phytofiltration is a potential eco-technique for removing arsenic from water. The aquatic moss species Warnstorfia fluitans grows naturally in mining areas in northern Sweden, where high concentrations of arsenic occur in lakes and rivers. This species was selected as a model for field, climate chamber and greenhouse studies on factors governing arsenic removal and arsenic phytofiltration of irrigation water. The arsenic and silicon (Si) concentrations in soil, water and plant samples were measured by AAS (atomic absorption spectrophotometry), while arsenite and arsenate species were determined using AAS combined with high pressure liquid chromatography (HPLC) with an anion exchange column. The arsenic content in grains of hybrid and local aromatic rice (Oryza sativa) cultivars with differing arsenic accumulation factor (AF) values was investigated in an arsenic hotspot in Bangladesh. The results showed that arsenic AF was important in identifying arsenic-safer rice cultivars for growing in an arsenic hotspot. The study based on silicon effect on arsenic uptake in lettuce showed that arsenic accumulation in lettuce (Lactuca sativa) could be reduced by silicon addition. The aquatic moss had good phytofiltration capacity, with fast arsenic removal of up to 82% from a medium with low arsenic concentration (1 µM). Extraction analysis showed that inorganic arsenic species were firmly bound inside moss tissue. Absorption of arsenic was relatively higher than adsorption in the moss. Regarding effects of different abiotic factors, plants were stressed at low pH (pH 2.5) and arsenic removal rate was lower from the medium, while arsenic efflux occurred in arsenate-treated medium at low (12°C) and high (30°C) temperature regimes. Besides these factors, low oxygenation increased the efficiency of arsenic removal from the medium. Finally, combining W. fluitans as a phytofilter with a lettuce crop on a constructed wetland significantly reduced the arsenic content in edible parts (leaves) of lettuce. Thus W. fluitans has great potential for use as an arsenic phytofilter in temperate regions.

Place, publisher, year, edition, pages
KTH: KTH Royal Institute of Technology, 2017. 49 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2017:02
Keyword
aquatic moss, grain, rice, lettuce, macrophyte, phytoremediation, speciation, temperature, oxygenation, wetland.
National Category
Earth and Related Environmental Sciences Other Environmental Engineering Botany Bio Materials Inorganic Chemistry
Research subject
Land and Water Resources Engineering
Identifiers
urn:nbn:se:kth:diva-203995 (URN)978-91-7729-332-3 (ISBN)
Public defence
2017-04-20, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170323

Available from: 2017-03-23 Created: 2017-03-22 Last updated: 2017-03-24Bibliographically approved

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