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Getting from mg/l to w/w

I know that w/w is g/100g so how is it possible to convert from mg/l.

Say I have a value of 10mg/l, what is this in w/w?

Reply 1

i_want_a_penguin

I don't think you can do it in w/w. I think it has to be w/v. Unless they are the same thing (I don't do a lot of compounding at work). Dunno if this helps:

w/v
an abbreviation for "weight by volume," a slightly confusing phrase used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution. The weight by volume is the mass (in grams) of the substance dissolved in or mixed with 100 milliliters of solution or mixture. For example, the concentration of fluoride in toothpaste is usually about 0.15% w/v, meaning that there is 0.15 gram of fluoride per 100 milliliters of toothpaste. Thus 1% w/v is equal to 1 gram per deciliter (g/dL) or 10 grams per liter (g/L).
w/w
an abbreviation for "by weight," used in chemistry and pharmacology to describe the concentration of a substance in a mixture or solution. Properly speaking, 2% w/w means that the mass of the substance is 2% of the total mass of the solution or mixture. The metric symbol g/g has the same meaning as w/w.

It's from http://www.unc.edu/~rowlett/units/dictW.html