Question

Convert 20 µg/dL Pb in blood to ppm. Please assume density of blood is 1 g/mL

Answer 1

Answer:- 0.0002 ppm

Solution:- 1 ppm is one mg of solute per liter of solvent or one kg of solvent.

It asks to convert
`(20\mu g)/(dL)` pb in blood to ppm. density of blood is
`(1g)/(mL)` .

Let's convert micrograms to milligrams and also calculate the mass of blood from it's given density. The set up could be made using dimensional analysis and doing unit conversions as:

First the set up for the conversion of micrograms of Pb to milligrams:

`(20\mu g)/(dL)((0.001mg)/(1\mu g))`

=
`(0.02mg)/(dL)`

Now, the set up for converting dL of blood to kg using it's given density and unit conversion from dL to mL as:

`(0.02mg)/(dL)((0.01dl)/(1mL))((1mL)/(1g))((1000g)/(1kg))`

= 0.200 ppm