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0.51 kg = 510,000 milligrams.
25 / 0.125 = 200
1 mg/kg = 1 ppm 1 mg = 1000 micrograms (ug) so 10 ug/kg = 0.01 mg/kg = 0.01 ppm
0.025g
1 kg = 1 million milligrams.