Research Article
Measurement of Total Free Iron in Soils by H2S Chemisorption and Comparison with the Citrate Bicarbonate Dithionite Method
Table 4
The sulfur capacities and estimated total free iron of six representative soil samples at 773 K under the experimental condition of 50% H2.
| Soil series | Breakthrough time (min) | Sulfur capacity (%) | Sulfur content by EA (%) | Sulfur balance (%) | Estimated total free iron (Fe2O3 %) | CBD-Fe (Fe2O3 %) |
| Taikon | 20.1 | 0.88 | 0.89 | 98.88 | 2.19 | 2.54 | Kuiren | 10.5 | 0.46 | 0.50 | 92.0 | 1.14 | 1.42 | Wukuiliao | 19.8 | 0.86 | 0.84 | 102.38 | 2.16 | 2.45 | Sofong | 3.8 | 0.16 | 0.18 | 88.88 | 0.41 | 0.45 | Jensui | 6.9 | 0.30 | 0.31 | 96.77 | 0.75 | 0.92 | Houli | 30.7 | 1.34 | 1.37 | 97.81 | 3.34 | 3.72 |
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