Journal of Chemistry / 2015 / Article / Tab 2

Research Article

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

Table 2

Soil Cd content and fractions of total Cd.

Soil Total 0.1 M HClaCd content by sequential extractionFraction of total Cd
ExchangeableInorganically boundOrganically boundOxide occludedResidue0.1 M HClExchangeableInorganically boundOrganically boundOxide occludedResidue
(mg kg−1)(mg kg−1)(mg kg−1)(%)

Uncontaminated-10.220.110.0690.0370.0460.0450.02250.331.516.721.120.610.2
Uncontaminated-20.360.210.0430.1310.1050.0360.04258.712.036.829.510.011.7
Uncontaminated-30.330.180.0510.1190.1080.0240.02456.415.736.533.07.47.4
Uncontaminated-40.270.180.1050.0530.0730.0210.01765.239.019.527.27.96.3
Uncontaminated-50.290.230.0790.0850.0910.0170.02278.027.028.830.95.87.5
Uncontaminated-60.230.160.0920.0580.0590.0120.01368.039.324.925.05.15.7
Uncontaminated-70.210.170.0470.0520.0790.0120.01979.622.524.738.05.98.9
Uncontaminated-80.210.150.0640.0500.0630.0150.01873.430.423.930.07.38.5
Uncontaminated-90.220.100.0350.0480.0610.0390.03644.115.921.728.017.816.6
Uncontaminated-100.280.180.0730.0570.0700.0520.02765.326.220.325.018.69.8

Contaminated-10.430.330.0960.1130.1400.0630.02076.122.226.232.414.54.6
Contaminated-20.550.310.1660.1180.1630.0830.01956.930.221.529.615.13.5
Contaminated-30.580.430.1130.1670.2000.0790.02573.319.428.634.213.44.3
Contaminated-40.610.390.2240.1260.1640.0700.02363.736.820.827.111.53.7
Contaminated-50.620.430.1070.1870.1840.1040.03869.217.230.229.716.76.1
Contaminated-60.670.500.0480.1920.2580.1410.03173.87.228.638.421.04.7
Contaminated-70.670.600.1370.1930.2180.0770.04989.220.328.632.311.57.3
Contaminated-80.740.450.2880.1290.1320.1550.03260.439.117.518.021.14.3
Contaminated-90.790.620.2720.2020.1680.1170.03178.934.425.621.314.83.9
Contaminated-100.880.750.1420.2800.2310.1660.06185.516.131.826.218.97.0

Uncontaminated-AV0.260.170.070.070.080.030.0263.925.925.428.810.69.2
Contaminated-AV0.650.480.160.170.190.110.0372.724.326.028.915.94.9

-test

Cd content extracted with 0.1 mol L−1 HCl (1 : 5 w/v).