Characteristics of Arsenic Migration and Accumulation in Wheats under Different Arsenic Levels and Its Health Risk Assessment
This study explored the growth,development,and arsenic(As)migration and accumulation characteristics of wheat in soils with different As concentrations to assess the health risks associated with wheat grains under varying levels of As stress and to propose a critical value for soil As contamination that is practical for wheat production in Gansu Province.Using anthropogenic-alluvial soil and Ningchun 4 variety of spring wheat as indicators,and referencing the soil As risk screening values from the'Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land(Trial)'(GB 15618-2018),7 concentration gradients were set from 0 to 3 times the soil quality standard As content for a soil-wheat system toxicity pot experiment.The results showed that As content in the roots,stems,and grains of wheat increased with soil As concentration,with the highest to lowest As content in the plant parts being roots,stems,and grains,respectively.The ability of different wheat parts to accumulate As was in the order:roots＞stems＞grains,with the accumulation capacity in roots and stems initially increasing and then decreasing with soil As concentration.The transfer coefficients(TF)for As in wheat plants were highest from roots to stems(TF stems/roots)followed by grains to stems(TF grains/stems)and grains to roots(TF grains/roots).Using adults in Gansu Province as the assessment subject and employing a human health risk assessment model with the Target Hazard Quotient(THQ)method,it was found that except for the control without added As2O5,the THQ values for all other As-stressed treatments exceeded the USEPA's recommended maximum acceptable risk threshold(THQ＞1.00),with a trend of initially increasing and then decreasing with rising soil As content.Based on local dietary habits and the human health risk assessment model,it is recommended that the safe production soil As concentration for wheat in Gansu Province should be less than 29.200 mg/kg.
Spring wheatAsStressConcentrationAnthropogenic-alluvial soilAccumulation and migrationTHQ MethodHuman health risk assessment
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