Journal of Chemistry / 2015 / Article / Tab 3

Research Article

Relationship between Cadmium Fractions Obtained by Sequential Extraction of Soil and the Soil Properties in Contaminated and Uncontaminated Paddy Soils

Table 3

Correlation between proportions of Cd chemical forms and soil propertiesa.

Soil propertiesUncontaminated soilsContaminated soils
ExchangeableInorganically boundOrganically boundOxide occludedResidue ExchangeableInorganically boundOrganically boundOxide occludedResidue

pH(H2O)(−)
pH(KCl)(−)(+)(−)(+)
T-C(−)(+)
T-N(−)(+)
CEC(−)(+)(+)
Ex-Ca(−)(+)(+)
Ex-Mg(−)(+)
Ex-K
Base saturation(−)(+)
Available phosphate(−)(+)(−)(+)
PAC(−)(+)(+)
Free iron oxide
Sand(+)(−)(−)
Silt(+)(+)
Clay(+)
Alo + 1/2 Feob(−)(+)(+)

(+): positive correlation, (−): negative correlation, (), (), and ().
bExtracted with acid oxalate.