When we face a problem in analytical chemistry, habitually, we must use a few patron to realize a calibrated straight line and this way find the concentration estimated of the sample problem.
The information must appear with a bit of rigor and all the results will have to go accompanied of its error. These errors always will exist and for this we cannot forget them.
The calculators, normally, give you the value of the error of slope and of y intercept. But the error in that more we are interested is the error in the calculated concentration from the straight line. This value can be calculated of a way near correctly from:
I have made a spreadsheet model for calculate easily the error of the calculated value from the straight line, and for the standard addition method, when y value is 0.
I leave the model and I hope that it’s useful for you.
Model for Gnumeric.
Model for OpenOffice.org.
Model for Excel.
If you have some problem when you saw this or you dont’ understand anything, give me an advice.
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