Why Use Interpolation Over Extrapolation for Calibration Curves?

[Beer-monster]

Could someone help me understand why interpolation rather than extrapolation should be used for calibration curves (with the exception of Standard additions). I know that extrapolation is less precise, but the book I've got doesn't over any more than that, and I think I need a little more detail for an exam.

 

[Gokul43201]

Well, what does a calibration curve tell you ?

 

[Beer-monster]

The relationship between concentration and signal strength for the analyte.

Would I be right in saying that you can't extrapolate as you can't be sure the curve remains linear (e.g because of self-absorption in ICP-AES)?

 

[Gokul43201]

Would I be right in saying that you can't extrapolate as you can't be sure the curve remains linear (e.g because of self-absorption in ICP-AES)?

That's exactly right !

 

[Beer-monster]

Wow, I feel so very stupid *smacks head*