Bioassessment of Cd and Pb at Multiple Growth Stages of Wheat Grown in Texturally Different Soils Using Diffusive Gradients in Thin Films and Traditional Extractants: A Comparative Study.

The growth stages showed a decreasing trend for the extraction of Cd with traditional extractants, which was S4 < S3 < S2 < S1, as indicated in Figure 4 , Figure 5 , Figure 6 and Figure 7 .

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With the single-step extraction methods, the assessment of Cd showed an increasing trend, as follows: HNO 3 (0.50 mg/kg) > EDTA (0.48 mg/kg) > ABDTPA (0.42 mg/kg) > DTPA (0.38 mg/kg) > NH 4 AOc (0.37 mg/kg) > NaNO 3 (0.24 mg/kg) > CaCl 2 (0.15 mg/kg) in the SCL-NC soil at the seedling growth stage.

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