Research Article
Uptake of Chromium by Portulaca Oleracea from Soil: Effects of Organic Content, pH, and Sulphate Concentration
Table 2
Soil composition at different values of pH.
| pH of soil | Soil composition | Pure silica (%) | Potting soil (70% organic matter content) (%) | Ajman soil (contains 42% CaCO3) (%) | CaO (%) |
| 6.0 ± 0.1 | 90 | 10 | — | — | 7.0 ± 0.1 | 85 | 10 | 5 | — | 7.3 ± 0.1 | 80 | 10 | 10 | — | 7.6 ± 0.1 | 75 | 10 | 15 | — | 8.0 ± 0.1 | — | 10 | 90 | — | 9.0 ± 0.1 | — | 10 | 90 | ∼0.1 |
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