How would I convert the following to ppm? 3 grams of lead found in 30kg of soil.

Any guidance is much appreciated!

2 Answers
anor277
Jun 22, 2018

#"1 ppm"-=1*mg*kg^-1#

Explanation:

And why #"part per million"#; because there are a million milligrams in a kilogram...

And so we gots…

#(3*gxx1000*mg*g^-1)/(30*kg)-=(3000*mg)/(30*kg)-=100*"ppm"#

Simon Moore
Jun 22, 2018

Like this.....

Explanation:

Converting a fraction into parts per million (ppm) works in the same way as converting a fraction into a percentage. The only difference is that you multiply the fraction by 1 million instead of multiplying it by 100.

First, form the fraction by ensuring that you have consistent units. 30 kg is 30 x 1000 g which is 30,000 g.

Now you can do the calculation. #3/30000 times 1000000 = 100#

So its 100 ppm.

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