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 soilSoil composition
Pure silica (%)Potting soil (70% organic matter content) (%)Ajman soil (contains 42% CaCO3) (%)CaO (%)

6.0 ± 0.19010
7.0 ± 0.185105
7.3 ± 0.1801010
7.6 ± 0.1751015
8.0 ± 0.11090
9.0 ± 0.11090∼0.1