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#1




Calculating a solution from mg/l to mg/kg based on a solid or liquid
If I make a calibration curve with HPLC. On the X ax is mg/l and on the Yax is the area.
I dilute for example 0,5 gram solid or liquid in a 10 ml volumetric flask and make it up to volume with eluent. After some sample prep I inject the solution into the HPLC and found a area which has a concentration of 4 mg/l compared to the calibration curve. If we suggest that the slope goes through zero it makes a concentration of area unknown/slope. After this I want to calculate the concentration in mg/kg. Am I right if I do it in this way. Area/slope = concentration 4 mg/l absolute But the sample weighted was in 10 ml volumetric flask so 1000 ml/10 = 100 4mg/l / 100 = 0.04 mg in 0,5 gram 1000 gram / 0.5 gram = 2000 2000*0.5 = 1000 mg/kg Is this the right way to do it? 
#2




Re: Calculating a solution from mg/l to mg/kg based on a solid or liquid
Quote:
The amount of substance of interest in 1kg is 1000g/0.5g x 0.04mg = 80 mg/kg When you write it out, make sure you know what each number stands for. 
#3




Re: Calculating a solution from mg/l to mg/kg based on a solid or liquid
Quote:
Thanks so I am calculating in the right way! 
#4




Re: Calculating a solution from mg/l to mg/kg based on a solid or liquid
yes definitely calculating it correctly! Keep up the good work.

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