Abstract
The chemical speciation of metal (Mg, K, Ca and Na) in agricultural and non-agricultural soils was investigated in upstream of the Pearl River, China. The result showed that the four metals speciation distributions of the agricultural soils were similar to those of the non-agricultural soils. Mg were dominated by the residual fraction, the order of Mg in each fraction was residual fraction > weak acid soluble fraction reducible fraction > oxidizable fraction. The distribution patterns of Na and K were similar, in most of the samples, the orders of Na and K in each fraction were residual fraction > weak acid soluble fraction > oxidizable fraction > reducible fraction. The order of Ca in each fraction was weak acid soluble fraction > reducible fraction > oxidizable fraction residual fraction. The bioavailability of Ca in the area was very high in both agricultural and non-agricultural soils.
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