From previous measurements of a low concentration of analyte, the signal detection limit was estimated to be in the low nanoampere range. Signals from seven replicate samples with concentration about three times the detection limit are: Sample Signal, nA 5 6. 7 5.0 5.0 5.2 4.2 4.6 6.0 4.9 Reagent blanks gave the following values:

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7. From previous measurements of a low concentration of analyte, the signal detection limit was estimated to be in the
low nanoampere range. Signals from seven replicate samples with concentration about three times the detection
limit are:
7
Sample
Signal, nA
2
3
4
5.0
5.0
5.2
4.2
4.6
6.0
4.9
Reagent blanks gave the following values:
Blank
1
3
4
7
Signal, nA
1.4
2.2
1.7
0.9
0.4
1.5
0.7
The slope of the calibration curve for higher concentrations is m = 0.229 nA/µM.
(a) Find the signal detection limit and the minimum detectable concentration.
(b) What is the concentration of analyte in a sample that gave a signal of 7.0 nA. [2.9; 7.3; 25.0]
Transcribed Image Text:7. From previous measurements of a low concentration of analyte, the signal detection limit was estimated to be in the low nanoampere range. Signals from seven replicate samples with concentration about three times the detection limit are: 7 Sample Signal, nA 2 3 4 5.0 5.0 5.2 4.2 4.6 6.0 4.9 Reagent blanks gave the following values: Blank 1 3 4 7 Signal, nA 1.4 2.2 1.7 0.9 0.4 1.5 0.7 The slope of the calibration curve for higher concentrations is m = 0.229 nA/µM. (a) Find the signal detection limit and the minimum detectable concentration. (b) What is the concentration of analyte in a sample that gave a signal of 7.0 nA. [2.9; 7.3; 25.0]
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