Economic and Environmental Geology

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Table. 3.

Table. 3.

Properties and results of sequential extraction in soils

Properties Location
Okdong Buguk
pH 5.60 ± 0.05 6.47 ± 0.01
CEC (meq/100 g) 9.1 ± 0.30 11.9 ± 4.30
LOI (%) 2.7 3.1
Step 1a (mg/kg) 0.02 ± 0.00 N.D.
Step 2b (mg/kg) 0.85 ± 0.00 0.33 ± 0.01
Step 3c (mg/kg) 10.03 ± 0.37 4.84 ± 1.62
Step 4d (mg/kg) 7.64 ± 0.73 3.02 ± 0.27
Step 5e (mg/kg) 5.74 ± 0.26 3.82 ± 0.80
Sumf (mg/kg) 24.27 ± 0.86 12.01 ± 1.34
Total Asg (mg/kg) 26.75 ± 1.56 13.09 ± 0.53
Recoveryh (%) 90.7 91.7

a: Non-specifically sorbed

b: Specifically sorbed

c: Amorphous and poorly-crystalline hydrous oxides of Fe and Al

d: Well-crystallized hydrous oxides of Fe and Al

e: Residual

f: Sum of step 1 to step 5

g: As concentration in soil by aqua-regia digestion

h: Recovery (%) = Sum / Total As × 100

Econ. Environ. Geol. 2022;55:209-17 https://doi.org/10.9719/EEG.2022.55.2.209
© 2022 Econ. Environ. Geol.