Chromatographic measurement error
Thread Content
If the nitrogen content in the standard gas is only 10%, while it is around 30% in the actual gas, how large is the measurement error?
I’m not quite sure what it means. Does that mean the marked value is 10%, while the measured value is 30%? If that’s the case, then verification is needed. It’s important to have scientific verification to determine who is right and who is not!
The standard gas contains 10%, while the substance to be tested contains 30%
I see, so if the external standard peak area method is used, there’s no problem, as it typically employs single-point correction, with linear correction at the zero-point being used for the other point. 30% of the test substance lies on the extended line of linearity. Or it can be called an extension cable. Of course, some calibrations are divided into upward extension, downward extension, and in-line. This standard gas can be used to calibrate the linearity of the instrument. If the concentration is still high, simply increase the concentration of the standard gas.
Aren’t the errors in chromatographic analysis within 2–5%? Isn’t this it?
:$ :$ :$ Thank you
The original poster is asking how large the linear error can be; if there is no deviation from a straight line, the results should be highly precise (in terms of both precision and accuracy). There is a risk of curve drift, which could lead to errors; in such cases, correction can be carried out using the multi-point calibration method. For example: five o’clock, seven o’clock, nine o’clock. If the points lie on a straight line, a calibration curve will suffice; otherwise, re-scaling or identifying the cause is necessary. The more points there are, the better the overlap, the more successful the calibration curve, and the smaller the measurement error. My personal understanding.