Question

Low concentrations of Ni-EDTA near the detection limit gave the following counts in a mass spectral...

Low concentrations of Ni-EDTA near the detection limit gave the following counts in a mass spectral measurement: 100., 160., 160., 184, 172,120., 196, 139, 156, 175. Ten measurements of a blank had a mean of 45 counts. A sample containing 1.00 µM Ni-EDTA gave 1797 counts.

(a) Find the mean.
counts

(b) Find the standard deviation.
counts

(c) Estimate the detection limit for Ni-EDTA.
counts
M

Homework Answers

Answer #1

In the following table are the data for the average and the standard devation

Counts Blank Count-Blank
100 45 55
160 45 115
160 45 115
184 45 139
172 45 127
120 45 75
196 45 151
139 45 94
156 45 111
175 45 130
Average 111.2
Standard Devation 29.352

For the detection limit, You can calculate the concentration in the samples using the concentration of the kown sample:

1uM 1797 counts
Detection limit 0.063 uM 111.2 counts (from the mean)
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