How to convert Cu conc from ppm to mg/l ?

[hazel]

Please help!

[LeoR]

Hi hazel,

In short, ppm = mg/L.

The long story:
1 milligram = 1/1,000 of gram.
1 gram = 1/1,000 of Kilogram.
1 mg = 1/1,000,000 of Kilogram.
1/1,000,000 = 1 ppm (parts per million).
And the final leap:
1 Kilogram = approx. 1 Liter (for "regular" water only).

Leo