As a scientist or an analytical professional, there will be a time you need to make some S.I conversions, one of which is from ppm To mg/l.
It is worthy of note that the concentrations of chemicals in water are typically measured in units of the mass of chemical (milligrams, mg or micrograms, ug) per volume of water (liter, L, l).
And concentrations in water can also be expressed as parts per million (ppm) or parts per billion (ppb). Parts per million and parts per billion may be converted from one to the other using this relationship: 1 part per million = 1,000 parts per billion.
This is why you need to know how this conversion is being done.
How To Convert From ppm To mg/l
For water, 1 ppm = approximately 1 mg/L (also written as mg/l) of contaminant in water, and 1 ppb = 1 ug/L (also written as ug/l). A measurement of 6 mg/L is the same as 6 ppm or 6,000 ppb, which is equal to 6,000 ug/L.
Read Also: Occupational exposure: Examples and OEL
Occasionally, concentrations of chemicals in water may be written as grams per cubic meter (g/m3). This is the same as grams per 1,000 liters, which may be converted to milligrams per liter (mg/L).
Therefore, 1 g/m3 = 1 mg/L = 1 ppm. Likewise, one milligram per cubic meter (mg/m3)is the same concentration in water as one per
liter (ug/L), which is about 1 ppb.
Example: convert 17 part/million (ppm) to mg/L:
17 part/million (ppm) = 17 × 0.9988590004 mg/L = 16.9806030068 mg/L
Part/million (ppm) to Milligram/liter Conversion Table
| Part/million (ppm) | Milligram/liter [mg/L] |
|---|---|
| 0.01 part/million (ppm) | 0.00998859 mg/L |
| 0.1 part/million (ppm) | 0.0998859 mg/L |
| 1 part/million (ppm) | 0.9988590004 mg/L |
| 2 part/million (ppm) | 1.9977180007 mg/L |
| 3 part/million (ppm) | 2.9965770011 mg/L |
| 5 part/million (ppm) | 4.9942950018 mg/L |
| 10 part/million (ppm) | 9.9885900037 mg/L |
| 20 part/million (ppm) | 19.9771800073 mg/L |
| 50 part/million (ppm) | 49.9429500184 mg/L |
| 100 part/million (ppm) | 99.8859000367 mg/L |
| 1000 part/million (ppm) | 998.8590003673 mg/L |
Read Also: How to convert ppm to mg/m3 (Use NIOSH Calculator)
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