Table 5 The person coefficient correlation (r) between soil cd chemical fractions and the G parameters of two-first order kinetics equation.

From: Mechanisms of Cd immobilization in contaminated calcareous soils with different textural classes treated by acid- and base-modified biochars

 

Cd-WsEx

Cd-Car

Cd-FeMnOx

Cd-OM

Cd-Res

G1

+ 0.16 ns

+ 0.09 ns

+ 0.17 ns

− 0.31 *

− 0.23 ns

G2

+ 0.23 ns

+ 0.05 ns

-0.18 ns

− 0.07 ns

− 0.19 ns

G3

− 0.40 **

-0.13 ns

+ 0.34 **

+ 0.32 **

+ 0.40 **

  1. *G1, the labile Cd or easily extractable component; G2, represents the less labile Cd or less extractable fraction; G3, corresponds to the non-extractable form of Cd; Cd-WsEx, soluble and exchangeable form of soil Cd; Cd-FeMnOx, iron and manganese oxide form of soil Cd; Cd-OM, Cd-bound to organic matter; Cd-Res, residual form of soil Cd; ns, non-significant; *significant at 0.05 probability level; **, significant at 0.01 probability level.
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