Question

In: Chemistry

13. The following calibration data were obtained for a total organic carbon analyzer (TOC) measuring TOC...

13. The following calibration data were obtained for a total organic carbon analyzer (TOC) measuring TOC in water:

Concentration, ug/l

Number of replicates

Mean Signal

Standard Deviation

0

20

0.03

0.008

6.0

10

0.45

0.0084

10.0

7

0.71

0.0072

19.0

5

1.28

0.015

Calculate the calibration sensitivity.

What is the detection limit for this method?

Calculate the relative standard deviation for each of the replicate sets.

Solutions

Expert Solution

Step I

Plot the concentration vs mean signal to get the slope which will be the calibration sensitivity of the TOC analyser.

m = 0.0656

Step II

Detection limit = (k*Sb)/m

Step III

Just put values of Standard deviation and m with k = 2 or 3 based on % of confident interval and calculate the limit of detection.

queen_honey_blossom answered 1 year ago
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