Translator for HPLC HINTS and TIPS for Chromatographers

Monday, August 1, 2011

Conversion Factors microgram, nanogram, ppm, ppb and percent:

Many years ago I made up this handy sample concentration conversion table . 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

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