Quadratic Calibration Curve
I created a quadratic calibration curve with 5 standards ranging from 0.001 to 0.06%. The R2 is 0.995. If I run a check standard at 0.02%, the curve calculates the concentration as 0.017% which is good for my application. If I run a check standard at 0.1% (above my curve), Empower3 does not return a result. I've tried several curve weightings but still no result. If I change the curve type to linear, Empower3 gives a result. I'm not that familiar with quadratic curves. Does the unknown concentration have to fall within the curve standard concentrations for a quadratic fit? Can Empower extrapolate if using a quadratic curve?