The following standard solutions were used to assess Mg in a river near Pengkalan Hulu. A graphite furnace atomic absorption spectrometer with a slot burner was utilised in the experiment. Solution Mg concentration (ppb) Absorbance Standard solution I 5.0 0.06 Standard solution II 10.0 0.71 Standard solution III 20.0 2.85 Standard solution IV 30.0 5.95 Standard solution V 40.0 12.20 Standard solution VI 50.0 18.20 Standard solution VII 100.0 30.10 Standard solution VIII 150.0 54.50 Standard solution IX 200.0 56.20 Standard solution X 250.0 58.40 Unknown PH-WR ? 55.30 Unknown PH-YH ? 44.60 (i). Using the standard solutions, construct an appropriate calibration curve (graph paper is not required). (ii). Identify the concentrations of unknown PH-WR and PH-YH. Show the way of getting the values. (iii). Explain whether the calibration curve can be used to determine the concentrations of unknown PH-WR and PH-YH.
The following standard solutions were used to assess Mg in a river near Pengkalan Hulu. A graphite furnace atomic absorption spectrometer with a slot burner was utilised in the experiment. Solution Mg concentration (ppb) Absorbance Standard solution I 5.0 0.06 Standard solution II 10.0 0.71 Standard solution III 20.0 2.85 Standard solution IV 30.0 5.95 Standard solution V 40.0 12.20 Standard solution VI 50.0 18.20 Standard solution VII 100.0 30.10 Standard solution VIII 150.0 54.50 Standard solution IX 200.0 56.20 Standard solution X 250.0 58.40 Unknown PH-WR ? 55.30 Unknown PH-YH ? 44.60 (i). Using the standard solutions, construct an appropriate calibration curve (graph paper is not required). (ii). Identify the concentrations of unknown PH-WR and PH-YH. Show the way of getting the values. (iii). Explain whether the calibration curve can be used to determine the concentrations of unknown PH-WR and PH-YH.
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter15: Molecular Luminescence Spectrometry
Section: Chapter Questions
Problem 15.16QAP
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Kindly answer this question i, ii & iii
Transcribed Image Text:The following standard solutions were used to assess Mg in a river near
Pengkalan Hulu. A graphite furnace atomic absorption spectrometer with a
slot burner was utilised in the experiment.
Solution
Mg concentration (ppb)
Absorbance
Standard solution I
5.0
0.06
Standard solution II
10.0
0.71
Standard solution III
20.0
2.85
Standard solution IV
30.0
5.95
Standard solution V
40.0
12.20
Standard solution VI
50.0
18.20
Standard solution VII
100.0
30.10
Standard solution VIII
150.0
54.50
Standard solution IX
200.0
56.20
Standard solution X
250.0
58.40
Unknown PH-WR
?
55.30
Unknown PH-YH
?
44.60
(i). Using the standard solutions, construct an appropriate calibration curve
(graph paper is not required).
(ii). Identify the concentrations of unknown PH-WR and PH-YH. Show the
way of getting the values.
(i). Explain whether the calibration curve can be used to determine the
concentrations of unknown PH-WR and PH-YH.
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