ppm and ppb are defined as:
1ppm = 1/106 = 10-6
1ppb = 1/109 = 10-9
1ppm = 1000ppb
So The number of parts-per million xppm is equal to the number of parts-per billion xppb divided by .
xppm = xppb / 1000
4000ppb is equal to 4ppm:
xppm = 4000ppb / 1000 = 4ppm
5000ppb is equal to 5ppm:
xppm = 5000ppb / 1000 = 5ppm
6000ppb is equal to 6ppm:
xppm = 6000ppb / 1000 = 6ppm
8000ppb is equal to 8ppm:
xppm = 8000ppb / 1000 = 8ppm
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