Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 12, Problem 12.12QAP
Interpretation Introduction
Interpretation:
For the given data, weight percentage of manganese is to be determined, where Mn to Ba count ratio is 0.936 considering barium as internal standard.
Concept introduction:
Weight percentage of Mn is calculated by plotting the graph between ratio of fluorescence intensity and weight percentage of Mn. The values used for this graph will be obtained by using a spreadsheet for the given data and calculation between cells of spreadsheet. Unknown quantities and required quantities are obtained by the calculation which will be done between cells of spreadsheet.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Note: The Emission Intensity of the original solution is not given since the calibration method is standard addition.
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.
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.
Chapter 12 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- How is isotope dilution mass spectrometry used in quantitative analysis?arrow_forwardWhich of the two instrumental modes, atomic absorption or atomic emission, results inthe better detection of metal ions in general? Describe the processes that an analyte solution goes through during atomization in the graphite furnace.arrow_forwardIn order to measure riboflavin in a breakfast cereal, a 5.00-gram sample of the cereal was extracted with acetic acid and filtered. The extract was transferred to a 50.0 mL volumetric flask and diluted to the mark. The sample was transferred to a cuvette and the fluorescence was measured. The instrument read 59 units (Fluorescence units –an arbitrary scale). 24.00 mL of the cereal extract was sample was mixed with 1.0 mL of a riboflavin standard that was 0.500 ug/mL. The fluorescence of this mixture was measured and read 94 fluorescence units. Calculate the concentration of riboflavin per gram of cereal (use µg/gram of cereal).arrow_forward
- N 2arrow_forward3arrow_forwardAtomic emission spectroscopy and the method of standard addition are used to determine the Na+ concentration and its uncertainty in an unknown sample. Increasing amounts of a 1.75 ug/mL standard Na+ solution are added to a series of volumetric flasks containing 15.00 mL of the unknown solution. The volumetric flasks are then diluted to a final volume of 200.0 mL. Atomic emission spectroscopy is then used to measure the emission intensity of each solution. Unknown volume Standard volume Final volume Emission (mL) (mL) (mL) intensity 15.00 0.00 200.0 351.0 15.00 5.00 200.0 494.0 15.00 10.00 200.0 642.0 15.00 15.00 200.0 807.0 15.00 20.00 200.0 948.0 Based on the data in the table, determine the original concentration of Nat and its uncertainty in the unknown sample. Report the uncertainty with three significant figures. concentration: ug/mL µg/mLarrow_forward
- A 25.0 mL aliquot was taken from a 500.0 mL sample of tonic water containing an unknown amount of quinine and diluted to a volume of 200 mL. At 347.5 nm, the fluorescence intensity of the diluted sample was measured 85.7 an arbitrary scale. Under similar conditions, a 27.5 ppm standard quinine solution had a fluorescence intensity of 185. Calculate the mass of quinine in the original tonic water sample in mg. Do not include units in your answer.arrow_forward4= An ion with a charge of +3 is accelerated into the 1.79 m flight tube of a linear time-of-flight (TOF) mass spectrometer with an acceleration voltage of 20.0 kV. It takes the ion 74.4 us to reach the detector. What is the mass (m) of the ion? Givesarrow_forwardQuinine 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.arrow_forward
- Atomic absorption spectroscopy was used to determine the amount of aluminum in a sample of sunscreen. A standard solution of 1.00 ng Al/L was prepared and measured seven times to determine the detection and quantitation limits of the spectrometer. The standard measurements were: 0.66, 0.98, 1.30, 1.17, 0.75, 1.19, and 1.02 ng Al/L. Calculate the detection and quantitation limits for this instrument. detection limit: ng/L quantitation limit: ng/L + TOOLS x10arrow_forwardHow do solvent, temperature, and pH affect fluorescence of fluorophore?arrow_forwardAn acceleration voltage of 15.0 kV is used to accelerate ions into the 1.48 m flight tube of a time-of-flight (TOF) mass spectrometer. The frequency at which spectra can be recorded is dependent on how long it takes the slowest ion to travel from the source to the detector. If you wish to scan up to m/z 13039, at what frequency (spectra/s) could spectra be recorded if a new spectrum begins each time the slowest ion reaches the detector? frequency: spectra/sarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning