Measurement of Total Free Iron in Soils by H₂S Chemisorption and Comparison with the Citrate Bicarbonate Dithionite Method

Table 1

Basic physical and chemical properties of the representative soil samples.

Soil series	Soil order	Soil group	pH	Sand	Silt	Clay	Texture	CEC; (cmole kg^−1)	CBD-Fe; (Fe2O3%)	CBD-Mn; (mg kg^−1)
Taikon	Alfisol	Slate noncalcareous	8.4	6.5	46.2	47.3	Silt clay	20.5	2.54	427
		Older alluvial soils
Kuiren	Alfisol	Noncalcareous	5.4	22.5	56.1	21.4	Silt loam	12.4	1.42	162
		Taiwan clays
Wukuiliao	Inceptisol	Slate noncalcareous	7.1	13.9	60.3	25.8	Silt clay loam	14.2	2.45	923
		Older alluvial
Sofong	Entisol	Schist calcareous	7.8	61.6	37.0	1.4	Sandy loam	5.7	0.45	142
		Younger alluvial soils
Jensui	Entisol	Schist noncalcareous	5.7	65.6	31.8	2.6	Sandy loam	8.3	0.92	558
		Younger alluvial soils
Houli	Ultisol	Diluvium red soils	5.1	32.2	35.6	32.2	Silt loam	7.8	3.72	245
Loupi	Ultisol	Diluvium red soils	4.0	14.3	34.2	51.5	Clay	8.40	4.28	117