How can I convert ng/mL to mg/kg for a Single extraction of Heavy metals samples ?
Conversion of units is a matter of tracking the units through the process. Stating with ug/ml, divide by 1000ug/mg, which will get you to mg/ml. Then Multiplying by the density of the solution in mg/ml will get you to mg/mg. Then multiply by 1,000,000 mg/kg will get you to the final answer. The units should cancel out as you proceed through the process.
The formula for converting ng/mL to mg/kg is:
mg/kg = (ng/mL x volume x density x 1000) / (molar mass x 1000)
For example, if you have a sample of 10 mL of water with a density of 1 g/mL and a molar mass of 18 g/mol, and you want to convert it to mg/kg for Cd, you can use the following steps:
- Convert ng/mL to mg/L by multiplying by 1000: 10 ng/mL x 1000 = 10 mg/L
- Convert mg/L to mg/kg by dividing by the density: 10 mg/L / 1 g/mL = 10 mg/kg
- Convert mg/kg to mg/g by dividing by the molar mass: 10 mg/kg / (18 g/mol) = 0.56 mg/g
Therefore, the concentration of Cd in the water sample is 0.56 mg/g.
Raghad's conversion is not correct. Molar mass does not enter into this calculation at all. The units of the final calculation here would end up being mg*mol/kg*g which is not meaningful.
To convert from ng/mL to mg/kg for a single extraction of heavy metal samples, you would need to take into account the density of the solution in which the heavy metals are present. Assuming a density of 1 g/mL for the solution:
It's important to be accurate with the measurements and units to ensure the conversion is done correctly.
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