Abstract
In the present study, a field experiment was conducted to investigate arsenic (As) concentrations in soils and in grains of 15 rice varieties in a contaminated site in Taiwan. The studied site was divided into two experimental units, namely plot A and plot B. The results showed that mean total As concentrations were 70.94 and 61.80 mg kg−1 in plot A and plot B, respectively, and thus greater than or approximate to the soil quality standard for total As in Taiwan (60 mg kg−1). The As levels in rhizosphere soil in plot A (19.71–32.33 mg kg−1) were much higher than in plot B (6.41–8.60 mg kg−1); however, As accumulation in brown rice did not significantly differ between the plots. These results implied that a significant variation in the bioconcentration factor (BCF) value of As existed among different rice genotypes, and a negative correlation was observed between BCF value and rhizosphere As level in the soil. In phytotoxicity, the median values of the ecological risk indicator were 104.85 and 103.89 in plot A and plot B, respectively, indicating considerable risk. In human health risk assessment, the median and 97.5%-tile values for cancer risk for both male and female residents were markedly higher than the acceptable risk (1 × 10−4). Furthermore, non-cancer and cancer risks were higher for males than females, mainly due to the greater rice ingestion rate of males. Sensitivity analysis showed that total As concentration in soil was the main factor affecting health risks, suggesting that priority should be given to the reduction of soil As levels. To better manage the phytotoxicity of As on rice, as well as the health risk to residents resulting from exposure to As-contaminated soils, the soil quality standard for As in farmland soils should be set between 5 and 10 mg kg−1. The methodology developed in this study could also be applied to provide the basis for refining and revising the soil quality standard for heavy metals in farmland in other regions and countries.
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The data used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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The data used and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Funding
This research was financially supported by the Ministry of Science and Technology, Taiwan, under grant nos. MOST 108–2313-B-343–001-MY3 and MOST 111–2313-B-343–001.
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All authors contributed to the study’s conception and design. Conceptualization: Kai-Wei Juang and Bo-Ching Chen; methodology: Bo-Ching Chen; formal analysis: Bo-Ching Chen; investigation: Kai-Wei Juang, Li-Jia Chu, and Chien-Hui Syu; resources and data curation: Li-Jia Chu and Chien-Hui Syu; software: Kai-Wei Juang and Li-Jia Chu; writing—original draft preparation: Bo-Ching Chen; writing—review and editing: Bo-Ching Chen; supervision and funding acquisition: Bo-Ching Chen.
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Juang, KW., Chu, LJ., Syu, CH. et al. Coupling phytotoxicity and human health risk assessment to refine the soil quality standard for As in farmlands. Environ Sci Pollut Res 30, 38212–38225 (2023). https://doi.org/10.1007/s11356-022-25011-3
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DOI: https://doi.org/10.1007/s11356-022-25011-3