Pure water containing no arsenic was spiked with 0.40 µg arsenate (AsO43) / L. Seven replicate measurements gave the following results: 5. Sample Recovered conc, µg/L 1 3 4 6 7 0.39 0.40 0.38 0.41 0.36 0.35 0.39 Find the mean percent recovery and the response-domain detection limit. [96; 0.064]
Pure water containing no arsenic was spiked with 0.40 µg arsenate (AsO43) / L. Seven replicate measurements gave the following results: 5. Sample Recovered conc, µg/L 1 3 4 6 7 0.39 0.40 0.38 0.41 0.36 0.35 0.39 Find the mean percent recovery and the response-domain detection limit. [96; 0.064]
Chapter3: Statistical Tests With Excel
Section: Chapter Questions
Problem 1P
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Kindly help me annswer #5. response domain detection limit. The answer shouldbe 0.064. I don't know how to get it. Thank you.
![10:46 AM Sun Oct 11
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a learn-ap-southeast-1-prod-fleet02-xythos.s3.ap-southeast-1.amazonaws.com
Pure water containing no arsenic was spiked with 0.40 µg arsenate (AsO4) / L. Seven replicate measurements
gave the following results:
5.
Sample
Recovered conc, µg/L
1
2
3
4
6
7
0.39
0.40
0.38
0.41
0.36
0.35
0.39
Find the mean percent recovery and the response-domain detection limit. [96; 0.064]
6.
The following data were obtained for a series of standard solutions prepared for the spectrophotometric
measurement of phosphate in a water sample.
P concentration, mg L-'
0.0
0.2
0.4
0.6
0.8
1.0
Absorbance
0.05
0.14
0.29
0.43
0.52
0.67
a)
Calculate the correlation coefficient for this set of data. [0.995]
b) Determine the sensitivity of the calibration curve. [0.626]
c) If the standard deviation of the blank was found to be 0.6097, what is the limit of detection for this method?
7.
From previous measurements of a low concentration of analyte, the signal detection limit was estimated to be in th
low nanoampere range. Signals from seven replicate samples with concentration about three times the detection
limit are:
Sample
1
3
4
5
7
Signal, nA
5.0
5.0
5.2
4.2
4.6
6.0
4.9](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6edcf33c-bf36-493f-a581-e1351e207dd6%2F4159fcb2-0cdb-4626-af88-8b9361f42f05%2F7aptizw_processed.png&w=3840&q=75)
Transcribed Image Text:10:46 AM Sun Oct 11
* 58% 4
a learn-ap-southeast-1-prod-fleet02-xythos.s3.ap-southeast-1.amazonaws.com
Pure water containing no arsenic was spiked with 0.40 µg arsenate (AsO4) / L. Seven replicate measurements
gave the following results:
5.
Sample
Recovered conc, µg/L
1
2
3
4
6
7
0.39
0.40
0.38
0.41
0.36
0.35
0.39
Find the mean percent recovery and the response-domain detection limit. [96; 0.064]
6.
The following data were obtained for a series of standard solutions prepared for the spectrophotometric
measurement of phosphate in a water sample.
P concentration, mg L-'
0.0
0.2
0.4
0.6
0.8
1.0
Absorbance
0.05
0.14
0.29
0.43
0.52
0.67
a)
Calculate the correlation coefficient for this set of data. [0.995]
b) Determine the sensitivity of the calibration curve. [0.626]
c) If the standard deviation of the blank was found to be 0.6097, what is the limit of detection for this method?
7.
From previous measurements of a low concentration of analyte, the signal detection limit was estimated to be in th
low nanoampere range. Signals from seven replicate samples with concentration about three times the detection
limit are:
Sample
1
3
4
5
7
Signal, nA
5.0
5.0
5.2
4.2
4.6
6.0
4.9
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