How can we calculate limit of H2S detection from CV and Amperometry?
You can better calculate it from differential pulse voltammetry (DPV) or square wave voltammetry (SWV) they are more sensitive, if you couldn't you can calculate it by CV by this relation: LOD= 3 SD/b ppm which SD is the standard deviation and b is the constant of the graph of I=aC+b
Hello,
I am sorry to note that the answer of Mouna Mekersi is wrong. The denominator (den) in the formula 3 SD/den should be the slope a of the line I = aC + b, not the constant b. (Dividing by the slope is necessary precisely in order to convert the standard deviation SD of the regression line, expressed in analytical signal, to that in concentration of the analyte.) Note also that you need to have the regression line near zero, since the slope in this specific range may be different from the slope of the entire calibration curve.
Alternatively, you can use the standard deviation of replicates obtained on the blank that is a (matrix) sample containing no analyte. In this case, 3 SD expressed in concentration is taken directly.
Regards,
Rouvim Kadis
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