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Effects of amendments on the fraction changes of Cd in 440 mg·kg−1 Si amended six soils (A) and in soil 3 under 0, 220, 440, 660, and 880 mg·kg−1 Si added dosages (B). Control, non-amendment treatment; MS, 4A molecular sieve; WS, wollastonite. F1—exchangeable fraction, F2—bound to carbonates/acid soluble fraction, F3—bound to iron and manganese oxides/reducible fraction, F4—bound to organic matter/oxidizable fraction, and F5—residual fraction.
