Phosphate rock origin Cd concentration (ppm)
USA 3-186
Morocco 3-165
Peru 2-186
Russia 0.1-<13
North Africa 60
South Africa 2-<13
Brazil 4
Jordan Aman 6<13
Togo 44-179
Tunisia ,Gafsa 38-173
Algeria 22.5-62,6
Syria 6.1-52
China(Yunam) 4
Mexico 8
Egypt (Quseir) Aug-74
Table 8: Global pattern of cadmium in contents in phosphate rocks.