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Blank subtraction
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Abstract

Blank subtraction is a necessary operation when analysing samples diluted in a solvent (blank). The A sample curve and B blank (curve) have been obtained from the same method using the same operating conditions. From an overlay of A and B, it is possible to get the A - B resulting curve (curve of the sample without blank) then to save this curve.

Experimental curves

The blue curve (A) has been obtained from a Chrono Coulometry performed on a polished platinum disk dipped in a Fe II/Fe III + pH 7 buffer solution. The black curve (B) has been obtained from the same Chrono Coulometry performed on the same polished platinum disk dipped in a pH 7 buffer solution.

Settings

Results

The red curve (R) is the A-B resulting curve.

Conclusion

This result curve can be saved and processed in the same way as the A and B ones (here calculation of the electrode active surface from a linear regression of the R = A-B curve [Q = f (square root of t)].

 



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