Please explain the answer.Plotting the ratio of atomic emission of Pb tothe atomic emission of yttrium (internalstandard) vs the concentration of Pb incontaminated water, the linear regressionequation from 10-point calibration was foundto be y=0.114x-1.8872. What would be theaverage concentration of Pb in contaminatedwater if three aliquot of a sample of 10 folds'diluted solution of contaminated waterprovided the ratio of emission of Pb to that ofyttrium as: 3.92, 3.86, and 3.87?а. 3.89 ppbb. 38.9 ppbс. 357 ppbd. 35.7 ppb

Answered: Please explain the answer. Plotting the…

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

Chapter12: Atomic X-ray Spectrometry

Section: Chapter Questions

Problem 12.12QAP

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Atomic Spectroscopy (a) In terms of spectral shape, how are atomic spectra different from molecular spectra? What is the source of this difference? (b) Describe the decision-making process for picking a line for atomic emission analysis of a given analyte. (c) For quality assurance, spike recovery is not sufficient to establish confidence in an analytical procedure. Explain this statement. What should be done instead to demonstrate satisfactory performance of an instrumental method (including elemental analysis). (d) Find a literature example of atomic spectroscopy used for elemental analysis. State the operating conditions with sufficient detail to reproduce the analysis; Please answer very soon will give rating surely All questions complete Answer needed Please help me
Quinine in a 1.553-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 250 mL of solution.A 10.00-mL aliquot was then diluted to 50.00 mL with the acid. The fluorescence intensity for the dilutedsample at 347.5 nm provided a reading of 196 on an arbitrary scale. A standard 100-ppm quinine solutionregistered 125 when measured under conditions identical to those for the diluted sample. Calculate the massin milligrams of quinine in the tablet.
Exactly 5.00 mL aliquots of a solution containing analyte X were transferred into 50.00-mL volumetric flasks and the pH of the solution is adjusted to 9.0. The following volumes of a standard solution containing 2.00 µg/mL of X were then added into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50 and 2.00 mL. The fluorescence of each of these solutions was measured with a fluorometer, and the following values were obtained: 3.26, 4.80, 6.42, 8.02 and 9.56, respectively. ii. Using relevant functions in Excel, derive a least-squares equation for the data, and use the parameters of this equation to find the concentration of the phenobarbital in the unknown solution.
The equation for the calibration curve prepared with a series of standard Na + solutions (1-5 mg / L) was calculated as y = 43.5x + 11.5. Since the emission intensity of the water sample prepared by diluting 10 times under the same conditions is 80, calculate the Na + concentration of the water sample in mg / L.
In a cavity the total energy U = aVT4i where d is îndependent of T. V and Show that F= + Tf(V) dnd S=4 d V TU-flv) ,wherce flu) Ps unknown. Using the fact that s)o tor Ts o or as Tso Show that the radiotion pressure P P=
The following data have been obtained in the calibration of a series of standards for the determination of iron, measuring the transmittance, at 506 nm and thickness of 1.00 cm of iron (II) solutions in which color with 1.10 has been developed -phenanthroline. [Fe] (ppm) 0.20 0.40 0.60 0.80 1.00 2.00 3.00 4.00 5.00 6.00 7.00 T (%) 90.0 82.5 76.0 69.5 63.5 41.0 26.3 17.0 10.9 7.0 4.5 Calculate the mean molar absorptivity of iron when determined by this method.
The levels of Vitamin B1 in a sample of milk was determined using the Standard Addition method and technique of fluorescence spectroscopy. 18.0 ml of the milk sample was diluted to 20.0 ml using distilled water and then the fluorescence was measured. The resulting signal was 210 units. A spike was made by taking 18.0 ml of the same milk sample, adding 1.0 ml of a 6.0 ppm Vitamin B1 standard solution, and then diluting to 20.0 ml using distilled water. The signal of the spiked milk was 540 units. Calculate the concentration of Vitamin B1 in the original milk sample (in ppm). Report to 3 decimal places.
In a hydrogen-oxygen flame, the atomic absorption signal for iron was found to decrease in the presence of high concentrations of sulfate. Suggest an explanation for this observation and propose one possible method for overcoming the potential interference of sulfate in the quantitative determination of iron.
Prepare 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.
A student wanted to determine the level of lead in amoxicillin powder, so he transferred 148 mg of the powder to 200 ml volumetric flask and completed the volume volumetrically, then he transferred 5 ml of the obtained solution to 50 ml volumetric flask and completed the volume properly, and read the absorbance of the obtained solution on AAS. The reading was 0.48. and the calibration equation was: "Y =12.25 x- 0.05" (concentration microg./mL). ?"Calculate the content of lead in amoxicillin as "ppm 326.5.a O 605.0 .b O 60.5.c O 17.5.d O 584.7.e O أخل اختياري
A student wanted to determine the level of lead in amoxicillin powder, so he transferred 148 mg of the powder to 200 ml volumetric flask and completed the volume volumetrically, then he transferred 5 ml of the obtained solution to 50 ml volumetric flask and completed the volume properly, and read the absorbance of the obtained solution on AAS. The reading was 0.48. and the calibration equation was: "Y =12.25 x- 0.05" (concentration microg./mL). Calculate the content of lead in amoxicillin as "ppm"? O a. 326.5 O b. 605.0
A series of standards of a rhodamine derivative were measured with an excitation wavelength of 480 nm (ex) and an emission wavelength of 620 nm (em). The following data was obtained: (i) (ii) (iii) Standard 1 2 3 4 5 Rhodamine Derivative Concentration (ppm) 1.9 4.0 5.8 8.2 10.0 Emission Intensity 1100 2150 3130 4350 5900 Explain the difference between the excitation wavelength and the emission wavelength. Using the data provided, determine the extinction coefficient in dm³.mg¹.cm-¹ and the molar extinction coefficient in dm³.mole¹.cm¹. The rhodamine derivative has a molar mass of 480 g.mole¹. If the unknown sample has a fluorescence emission intensity of 3899, calculate the concentration of the sample in parts per million (ppm) and moles dm³ (molarity).

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