Many years ago I made up this handy sample concentration conversion table. Be sure and take into account the density of the compounds first. I find that it is still useful when reporting results to clients.
Parts per million (ppm)
|
Percent (%)
|
| 1 |
0.0001
|
10
|
0.001
|
100
|
0.01
|
1,000
|
0.1
|
10,000
|
1.0
|
100,000
|
10.0
|
1,000,000
|
100.0
|
ppm = ug/ml
1,000 ug/ml
|
=
|
0.1 %
|
=
|
1,000 ppm
|
100 ug/ml
|
=
|
0.01 %
|
=
|
100 ppm
|
10 ug/ml
|
=
|
0.001 %
|
=
|
10 ppm
|
1 ug/ml
|
=
|
0.0001 %
|
=
|
1 ppm
|
100 ng/ml
|
=
|
0.00001 %
|
=
|
100 ppb
|
10 ng/ml
|
=
|
0.000001 %
|
=
|
10 ppb
|
1 ng/ml
|
=
|
0.0000001 %
|
=
|
1 ppb
|
