Accumulation of arsenic in tissues of rice plant (Oryza sativa L.) and its distribution in fractions of rice grain

Overview

Rahman and colleagues measured total arsenic in rice plants and milled rice fractions from two Bangladesh rice varieties grown in arsenic-affected Satkhira district fields. The paper reports dry-weight total arsenic values for raw rice, brown rice, bran-polish, polish rice, husk, straw, root, soil, and irrigation water. For HMI routing, the edible rice-grain values are the product occurrence data; soil, water, straw, root, husk, and bran-polish values are supply-chain context rather than direct rice-bulk-grain occurrence rows.

Key numbers

• Publication identity: Chemosphere 69(6):942-948, DOI 10.1016/j.chemosphere.2007.05.044; the raw PDF is an author manuscript with a first-page title matching the published article.
• Study area context: irrigation water from shallow tube wells contained total arsenic 0.070±0.006 mg l-1 in the abstract (n=6), while the Results paragraph reports study-area soil and water total arsenic of 14.5±0.1 mg kg-1 and 0.070±0.006 mg l-1, respectively (n=3).
• Rice varieties: BRRI dhan28 and BRRI hybrid dhan1; rice, soil, and water were collected from arsenic-affected Itagasa and Guddirdangi village sampling areas in Satkhira district, Bangladesh.
• Raw rice total arsenic: BRRI dhan28 0.6±0.0 mg kg-1 dry weight; BRRI hybrid dhan1 0.7±0.2 mg kg-1 dry weight; the paper states n=3.
• Brown rice total arsenic: BRRI dhan28 non-parboiled 0.8±0.1 mg kg-1 dry weight and parboiled 0.5±0.0 mg kg-1 dry weight; BRRI hybrid dhan1 non-parboiled 0.8±0.2 mg kg-1 dry weight and parboiled 0.6±0.2 mg kg-1 dry weight.
• Polish rice total arsenic: BRRI dhan28 non-parboiled 0.4±0.0 mg kg-1 dry weight and parboiled 0.3±0.1 mg kg-1 dry weight; BRRI hybrid dhan1 non-parboiled 0.4±0.1 mg kg-1 dry weight and parboiled 0.5±0.1 mg kg-1 dry weight.
• Rice-fraction context: husk total arsenic was 1.1±0.2 and 0.7±0.1 mg kg-1 dry weight for non-parboiled and parboiled BRRI dhan28; the corresponding BRRI hybrid dhan1 values were 1.6±0.1 and 0.8±0.2 mg kg-1 dry weight.
• Bran-polish context: BRRI dhan28 bran-polish total arsenic was 0.9±0.1 and 0.6±0.2 mg of As kg-1 dry weight for non-parboiled and parboiled rice. The extracted text does not print the corresponding BRRI hybrid dhan1 bran-polish numeric cells, although the paper states the hybrid fractions contained higher arsenic than BRRI dhan28 fractions.
• Plant-tissue context: BRRI dhan28 contained 46.3±1.4 in root, 1.7±0.1 in straw, and 0.6±0.0 mg kg-1 dry weight in raw rice; BRRI hybrid dhan1 contained 51.9±1.3, 1.9±0.1, and 0.7±0.2 mg kg-1 dry weight, respectively.
• Fraction mass distribution: in Table 1, brown rice represented 77.1, 75.9, 77.9, and 77.8% dry weight for BRRI dhan28 non-parboiled, BRRI dhan28 parboiled, BRRI hybrid dhan1 non-parboiled, and BRRI hybrid dhan1 parboiled rice, respectively; polish rice represented 69.8, 68.6, 67.0, and 67.2% dry weight.
• The source’s own ordering statement for rice fractions is rice hull > bran-polish > brown rice > raw rice > polish rice. This is preserved as the authors’ total-arsenic distribution finding, not converted into inorganic arsenic.

Methods (brief)

Rice and soil samples were acid-digested using nitric acid and perchloric acid; soil digestion also used sulfuric acid. Water samples from shallow tube wells were filtered through 0.45 Millipore filter paper and preserved with 2M hydrochloric acid. Total arsenic was determined by hydride generation atomic absorption spectrophotometer (HG-AAS) using a Perkin-Elmer AAnalyst 100 with FIAS 100. Quality checks included reagent blanks, spikes, duplicate samples, spike recovery 87.4% (n = 6), and NIST SRM 1573a tomato leaf with certified arsenic 0.112±0.004 µg g-1 and measured arsenic 0.120±0.009 µg g-1. The method measured total arsenic only; no inorganic-arsenic speciation was performed.

Related evidence

• Arsenic, Total
• Rice
• Rice (white, brown, wild — bulk grain)

Update history

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