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(a)
Interpretation:
A graph should be plotted using the spreadsheet for given information.
Concept introduction:
Flame emission spectrography is so named because the atoms are exposed to a flame to get the required amount of energy of excitation. This is a classical method and has been widely replaced by the plasma spectroscopies.
(b)
Interpretation:
The least square equation for the given data should be determined.
Concept introduction:
Flame emission spectrography is named so, because the atoms are exposed to a flame to get the required amount of energy of excitation. This is a classical method and has been widely replaced by the plasma spectroscopies.
(c)
Interpretation:
The statistics of the line plotted in option b should be determined.
Introduction:
Flame emission spectrography is so named because the atoms are exposed to a flame to get the required amount of energy of excitation. This is a classical method and has been widely replaced by the plasma spectroscopies.
(d)
Interpretation:
The percentage of Na2O in each given sample and the absolute and relative standard deviations should be determined.
Introduction:
Flame emission spectrography is so named because the atoms are exposed to a flame to get the required amount of energy of excitation. This is a classical method and has been widely replaced by the plasma spectroscopies.
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Chapter 9 Solutions
Principles of Instrumental Analysis
- An atomic absorption method for the determination of the amount of iron present in used jet engine oil was found from pooling 30 triplicate analyses to have a standard deviation s = 3.1 µg Fe/mL. If s is a good estimate of o, calculate the 95 and 99% confidence intervals for the result 21.7 µg Fe/mL if it was based on the following criteria. (a) a single analysis 95% confidence interval= 21.7 + 99% confidence interval = 21.7 + (b) the mean of two analyses 95% confidence interval = 21.7 + 99% confidence interval= (c) the mean of six analyses 21.7 ± 95% confidence interval = 21.7 + 99% confidence interval= 21.7 + μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mLarrow_forwardYou have measured the blank for a determination of arsenic in food samples by hydride-generation atomic fluorescence spectrometry. The blank values are: 0.23 ppb, 0.14 ppb, 0.16 ppb, 0.28 ppb, 0.18 ppb, 0.09 ppb, 0.10 ppb, 0.20 ppb, 0.15 ppb, 0.21 ppb As. What is the LOD?arrow_forwardAn atomic absorption method for the determination of the amount of iron present in used jet engine oil was found from pooling 30 triplicate analyses to have a standard deviation s = 3.6 mg Fe/mL. If s is a good estimate of σ, calculate the 95 and 99% confidence intervals for the result 18.5 mg Fe/mL if it was based on (a) a single analysis, (b) the mean of two analyses, and (c) the mean of four analyses.arrow_forward
- Please answer all required.arrow_forwardA sample of body serum is to be analysed for sodium by flame emission spectroscopy. 1.00cm' aliquot of serum was pipetted into each of two 50.0cm' volumetric flasks. The first flask was diluted to volume with deionised water. The absorbance of this first solution was0.350. To the second flask 10.0 cm' of a 25.0 ppm sodium standard was added and the flask made up to volume with deionised water. The absorbance of this second solution was 0.720.(i) Calculate the concentration of the sodium in the body serum in mg dm-3.arrow_forwardPrepare a calibration curve to determine the Pb content in a well water sample using atomic absorption spectrophotometry; the following data were recorded: % T 100 75.2 56.6 42.5 31.9 24.6 13.8 ppm Pb 0 0.2 0.4 0.6 0.8 1.0 1.4 A 50 mL aliquot of well water is taken and diluted twice, the% T reading is taken and a value of 40.6% is recorded. Calculate the ppm of Pb in the well water.arrow_forward
- A solution was prepared from an amount n = (0.500 ± 0.005) mol dissolved in a volume V = (250.0 ± 0.5) cm3. What is the absolute uncertainty in the concentration in units of mol dm-3?arrow_forwardInductively coupled plasma–optical emission spectrometry (ICP-OES) was used for the determination of cadmium using indium as an internal standard. A solution containing 2.15 ppm Cd2+ and 5.76 ppm In3+ gave signals of 19,291 and 37,190 counts for cadmium and indium, respectively. A 0.01652 g sample was dissolved in acid and quantitatively transferred to a 250.0 mL volumetric flask. A 1.00 mL aliquot of 264.5 ppm In3+ was added and the flask was diluted to volume with deionized water. ICP-OES analysis of the sample solution gave signals of 31,109 and 118,941 counts for cadmium and indium, respectively. What was concentration of the Cd2+ in the sample? Give answer all questions with explanationarrow_forward4) 1.580 g soil sample was analyzed for its copper content. The soil sample was completely digested with HNO3-H2O2 mixture and diluted to 50.0 mL with distilled water. 2.0 mL of this solution was taken into a volumetric flask and diluted to 10.0 mL with distilled water. It was analyzed by FAAS system and its average absorbance was calculated as 0.2564. Calibration plot for copper is shown below. Absorbance 0,7 0,6 0,5 0,4 0,3 0,2 0,1 0 10 y = 0,0291x-0,0082 R² = 0,9993 15 Copper, mg/L 20 Calculate the percentage of copper in the soil sample as ppm. 25arrow_forward
- 2. Answer ALL parts. (a) The absorbance of compound A was measured in a 1.00 cm cuvette at 238 nm. A 3.96 x 10 M solution of compound A exhibited an absorbance of 0.624. A blank solution containing only the solvent had an absorbance of 0.029 at the same wavelength. Calculate the molar absorptivity of compoundA in m' mole". (i) The absorbance of an unknown solution of Compound A in the same solvent and cuvette was 0.375 at 238 nm. Find the concentration of A in the unknown. (iii) A concentrated solution of Compound A in the same solvent was diluted from an initial volume of 2.00ml to a final volume of 25 ml and then had an absorbance of 0.733 under the same conditions. What is the concentration of A in the concentrated solution? (iv) What type of cuvette was used in the above analysis? Justify your answer. (b) Name ONE advantage and ONE disadvantage of a linear photodiode array detector compared to a traditional photomultiplier based spectrometer. (c) Why is an FTIR spectrum digital in…arrow_forwardIn the analysis conducted with flame AAS, standard solutions of the X-type are analyzed individually and the absorbance values obtained are plotted against concentration (ppm). It was seen that the slope of the calibration line obtained was 0.0925. The standard deviation of the absorbance values obtained by reading the blank 10 times under the same conditions was calculated as 0.00183 ppm. According to this; For the X-type calculate the following: a) LOD b) LOQ c) Sensitivityarrow_forward6. In a flame spectrometric determination of sodium, lithium is used as an internal standard. Assume the spectrum of a standard solution that contains 2.00 ppm Na and 100 ppm Li shows two peaks with intensities of Ina= 4.22 and IL= 9.24, respectively. An unknown sample solution that also contains 100 ppm Li gives two peaks with intensities of Ina = 6.16 and I= 8.24, respectively. Calculate the concentration of Na in the unknown sample in ppm. А. 3.08 ppm В. 6.16 рpm C. 4.22 ppm D. 3.27 ppm Е. 12.1 ppmarrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
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