About FID
About FID
(OP)
How can I get the VOC concentration from FID- and calibration curve? Is there some procedure?
What's the relationship between Chromatogram and FID response?
What's the relationship between Chromatogram and FID response?





RE: About FID
Hope this help.
RE: About FID
1 With fresh air or through an activated carbon filter I adjust the ZERO.
2 I adjust the span with a known reference gas (usualy propane in air at 75 ppm propane)
3 I read ppm in the gas to be measured for example 55 ppm equivalent propane.
4 If we don't know the type of VOC we have to measure we simply say VOC 55ppm equiv propane or 55 x 44/22.4 = 108mg/Nm3 equiv propane or best 55 x 36/22.4 = 88.4 mg C/Nm3.
5 If we know the type of VOC, for exemple Methylen Chloride, there is a multiplication factor to be used for conversion of ppm propane to mg Solvant/NM3.
I hope this will help you (sorry for my bad english)
JPPMJ
RE: About FID
Look at it this way, lets say we want to read voc1, range 100ppm-2000ppm. I'd get voc1 standard and do, for example, (100,200,800,1200,1600,2000)ppm after each one FID would give response (best taken as area of the pick), for example, (xvfx,xxgfxx,xxxhghxxx,xxghgdxx,xxxxdrxx)then yourself or software plot response=function (amount). Now you are ready to measure.