Originally Posted by dawd
convert 0.073 ppm of iron from 0.5g ashed solid sample and diluted in to 50ml solution
in to mg/kg.
Hi David, maybe you are looking at the problem backwards.
I gather your results from the solution are 0.073ppm (assume mg/L) Fe.
You only have 50mL, so you have to work out the proportion of Iron in that volume: 50/1000 x 0.073mg = 0.00365mg.
The amount of iron in your sample is 0.00365mg. Now you need to work out how much there is in 1kg: 1000/0.5 x 0.00365 = 7.3mg/kg