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 Concentration determination with Polynomal fit Fun
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Locardas

24 Posts

Posted - 06/29/2022 :  11:56:18 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro2021
Operating System:windows

Dear Origin Forum,

I have received measurement data from an instrument and plotted it on an x(concentration)-y(peak area) graph. Afterwards, I used Analysis/Fitting/Polynomial Fit to fit the curve (see picture).



I want to use the resulting quadratic function (calibration function) to calculate the concentrations for each signal in my samples. For this, I have already copied the corresponding 42 samples with the related peak areas into another origin workbook (see Figure 2, Y-columns = samples with peak areas, X = signal identification with "ID" ).



I would now like Origin to access the values (Intercept, B1 and B2) of the calibration curve and use them to calculate and tabulate the concentrations for each sample. Can you please tell me how to do this?

I know that you can do this yourself using the famous pq-formula. But I think there might be a workflow for Origin that is at least as good.

Many greetings,
Locardas

YimingChen

1108 Posts

Posted - 06/29/2022 :  12:09:33 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
In the Polynomial Fit... dialog, go to Find X/Y tab. Check the box Find Y from X and run the fitting. There will be a new worksheet containing Find X/Y table named something like FindXfromY. You can enter the Y values into the first column in the table and the X values will be calculated automatically.

James

Edited by - YimingChen on 06/29/2022 12:10:00 PM
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Locardas

24 Posts

Posted - 06/29/2022 :  12:17:42 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you James,

as it must be... a quick, precise and simple answer.

Many greetings,
Locardas
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