Hi,
We have a problem with repeatability of the results. Internal standard (Y) measurements are also unstable, eg for four samples the results are 1.05; 1.04, 1.04, 1.05 but for the next sample the result is 1.89. And I don't know why. Sometimes I have to repeat the sample twice to get the good value of the internal standard. This problem appears also for calibration standards. Mayby I should add that we use the online system for the internal. The second problem is unrepeatability of the results of our samples. For the three replicate from the same sample I got the different concenration (-0.127,0,25 and 4014). This problem appears not everyday but often and always for radial obserwation. Do you have any idea how to deal with these problems? Thank You for your help!
Sabina