Okay folks, I have a units issue that I need to resolve with the least amount of complication possible.
I know that mg/kg = ppm by weight just like mg/L = ppm by volume. But here's my problem:
I have to have an outside lab test my ethanol and denaturant for sulfur content. I neglected to review the ASTM method and see that the results would likely be reported in mg/kg. So when I got my results I'm like daaaaang
Because when I prepared several samples of neat ethanol to which I added specific amounts of denaturant I did it by volume; 1 mL in 50 mL for example.
Now I can't just subtract the sulfur contribution of the denaturant (natural gasoline btw) because in no way is the density of ethanol, natural gasoline, or any blend of the two equivalent to water.
So what I think
I have to do is take the specific gravity of my denaturant (0.659 avg
) to calculate the sulfur content per volume.
Then I would have to determine the density of my denatured ethanol solutions and do the same thing. Then I can subtract the contribution of the denaturant.
Is this the correct approach?