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