Calculating parts per million (1 Viewer)

[edd91]

Can anyone tell me how this is done?? For instance if you have 5mls of oil diluted to 50mls with a suitable solvent and you're testing for silver with AAS and get a reading of 0.230, how do you calculate the concentration of silver in ppm

btw this is from the NEAP CM&M paper

 

[CM_Tutor]

You need the calibration data - You would have been given enough information to draw a graph to determine the relationship between absorbance values and concentrations.

 

[edd91]

Yeah you were
, for 1ppm standard solution concentration the AAS was 0.105, for 2ppm it was 0.195, for 3ppm it was 0.285, for 4ppm it was 0.375

so do you compare those values to yours?

 

[Xayma]

Draw a graph, look at where the AAS was 0.230 then times it by 10 (since you diluted it)

edit: Multiplication factor was wrong

 

[edd91]

Ah sweet, easy, but wouldnt you times it by 10?