0.001

1

0.0000001

0.01

10

0.000001

0.1

100

0.00001

1

1,000

0.0001

10

0.001

100

0.01

1,000

0.1

10,000

1

Other useful conversions: 1 mg/kg = 1 ppm; 1 g/ton = 1.1 ppm; 100 g/ton = 110 ppm