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Start Over Author "Helian, Li" Journal ecotoxicology and environmental safety
2 results on '"Helian, Li"'

1. Accumulation of Cr in different vegetables and derivation of soil Cr threshold using the species sensitivity distribution method

Author

Xuezhen Yu, Helian Li, Qian Yang, Zongquan Sun, and Yibing Ma

Subjects
Cr, Vegetable, Bioconcentration factor, Species sensitivity distribution, Safety threshold, Environmental pollution, TD172-193.5, Environmental sciences, GE1-350
Abstract

Due to its high mobility and bioavailability, hexavalent chromium [Cr(VI)] in agricultural soil can be taken up by crops and pose threat to human being. In this study, two soils (Jiangxi red soil and Shandong fluvo-aquic soil) spiked with Cr(VI) and 8 common vegetable varieties were used to conduct the pot experiment. The bioconcentration factor (BCF) values based on the tetraacetic acid extractable Cr (EDTA-Cr) in soils were used to construct the species sensitivity distribution (SSD) curve. Afterwards, the soil Cr threshold was derived based on the critical BCF value and the permissible limit of Cr for vegetables. The results showed that when spiked with 5.6 mg kg−1 of Cr(Ⅵ), the soil EDTA-Cr concentrations were significantly increased compared with the control except Jiangxi red soil planted with carrot and radish, while the Cr concentrations in the edible parts of vegetables in both soils were below the permissible limit (0.5 mg kg−1 FW). However, there are dramatic differences in the accumulation of Cr by different varieties of vegetables. Apparent discrepancy was observed between the two soils for the bioconcentration of Cr by carrot. Among the leafy vegetables, lettuce and oilseed rape are the most and the least sensitive to Cr pollution, respectively. The safety threshold values of EDTA-Cr were 0.70 mg kg−1 for Shandong fluvo-aquic soil and 0.85 mg kg−1 for Jiangxi red soil, respectively. This study provides information on the safety production of vegetable products in Cr(Ⅵ) polluted soils and is helpful to the revision of soil quality standards of Cr. more...

Published
2023
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2. Integrating bioavailability and soil aging in the derivation of DDT criteria for agricultural soils using crop species sensitivity distributions

Author

Zongquan Sun, Xuemei Han, Yanhua Qiu, Ma Yibing, Xiuyue Yu, and Helian Li

Subjects
Crops, Agricultural, China, Health, Toxicology and Mutagenesis, 0211 other engineering and technologies, Biological Availability, Bioconcentration, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, DDT, Toxicology, Soil, Species Specificity, Soil Pollutants, Agricultural productivity, Water content, Environmental quality, 0105 earth and related environmental sciences, 021110 strategic, defence & security studies, business.industry, Public Health, Environmental and Occupational Health, Agriculture, General Medicine, Food safety, Pollution, Bioavailability, Soil water, Environmental science, business, Environmental Monitoring
Abstract

Although the agricultural use of dichlorodiphenyltrichloroethane (DDT) has been banned for decades in many countries around the world, the detection of DDT and its metabolites in soils is very common due to their persistence. DDTs (sum of DDT and its metabolites) in farmland soils can be absorbed by crops at different levels and accumulate in the edible parts of agricultural products, posing threats to the health of human being. However, no information on the species sensitivity distribution (SSD) of crops with regard to DDTs has been reported due to the lack of enough bioavailability data and models to normalize the bioavailability data from different sources. Based on the bioconcentration factors of 17 crop species in Chinese soils obtained from previous studies, the criteria of DDTs in soils was derived according to the quality standard of agricultural products using the SSD method. Corrections for water content and aging time were conducted to normalize the data from different sources. The risk values of agricultural products at different concentration levels of DDTs in soils were also evaluated. It was found that oil crops are able to take up more DDTs than non-oil crops, so the soil criteria were calculated separately for oil crops and non-oil crops, which were 0.083 mg/kg and 0.29 mg/kg, respectively. With the residual concentrations of DDTs in soils at the range of 0.01–0.5 mg/kg, 0–8% of the agricultural products exceeded the permissible limits for DDTs which were set in the National Food Safety Standard of China. The results also demonstrated the feasibility for applying SSDs to derive the soil criteria of DDTs in order to ensure the safety of agricultural products. This work will provide information for the risk assessment and the establishment of soil environmental quality standards to ensure safe agricultural production. more...

Published
2018

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