Fig. 6. Residual cadmium content in the phosphate sample after partial oxidation of
the organic matter with 40 mg L1 H2O2 followed by leaching with different
chemicals. Solid/liquidratio: 1:4, chemical concentration: 0.1 mol L1
, leaching
time: 5 h, temperature: 25 C, initial cadmium content: 49.5 mg kg1
.