Which statement accurately contrasts flame atomization and graphite furnace atomizationin Atomic Absorption Spectroscopy (AAS)?Flame atomization requires smaller sample volumes compared to graphite furnace atomization,which is more suitable for bulk analysis.Graphite furnace atomization achieves higher temperatures than flame atomization, oftenresulting in better sensitivity and lower detection limits.Flame atomization is typically used for solids and high-viscosity liquids, whereas graphite furnaceatomization is preferred for volatile liquid samples.Graphite furnace atomization is a less precise method than flame atomization due to theinhomogeneity of the sample matrix within the furnace.

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Answered: Which statement accurately contrasts…

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter2: Basic Statistical Analysis With Excel

Section: Chapter Questions

Problem 10P

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Set up simultaneous equations for the analysis of Mo, Ti and V mixture by the peroxide method, using the data below. Standard solutions of Mo, Ti and V each at a known concentration of 2.00 mg of metal in a volume of 50.00 mL were measured at three wavelengths. Absorbances were measured to be: Metal 330nm 410nm 460nm Mo 0.416 0.048 0.000 Ti 0.130 0.608 0.410 N 0.000 0.148 0.200 An unknown solution was treated and diluted to a volume of 50.00 mL and the following absorbances were obtained: Abs at 330 nm = 1.189 Abs at 410 nm = 1.405 Abs at 460 nm = 0.952 Determine the mass (in mg) of each metal present in the unknown solution. Enter your numerical answer into the space provided: mass Mo= mg mass Ti = mg mass V = mg
A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53%. Calculate the 90% confidence interval for the mean of the the three data, assuming that (a) the only information about the precision of the method is the precision for the three data. (b) on the basis of long experience with the method, it is believed that s---->σ lindane. (c) If s=0.28 is good estimate of σ, how many replicate measurement should be made in order for the mean for the analysis of sample to be within 0.2% of the true mean 90% of the time.
1
Place the methods listed in the table below in order of increasing sensitivity for the detection of tellurium (Te). Place the least sensitive first and the most sensitive last. Method Signal to Noise ratio for Te 0.107 ppm Flame Atomic Absorption Furnace Atomic Absorption Hydride Atomic Absorption Inductively Coupled Plasma Emission 0.00020 mg L-1 0.004 ppb 6 ng mL-1
Which of two instrumental modes, atomic absorption or atomic emission, results in the better detection of metal ions in general? Describe the processes that can analyte solution goes through during atomization in the graphite furnace?
Mercury(II) forms a 1:1 complex with triphenyltetrazolium chloride that exhibits an absorption maximum at 255 nm. The mercury(II) in a soil sample was extracted into an organic solvent containing an excess of TTC , and the resulting solution was diluted to 100.0 mL in a volumetric flask. Five-milliliter aliquots of the analyte solution were then transferred to six 25-mL volumetric flasks. A standard solution was then prepared that was 5*10^-6 M in . Volumes of the standard solution shown in the table were then pipetted into the volumetric flasks, and each solution was then diluted to 25.00 mL. The absorbance of each solution was measured at 255 nm in 1.00-cm quartz cells. Please solve and explain these questions: A.) Enter the given data pictured above into a spreadsheet and show the correct standard additions plot B.) Determine the slope and the intercept of the line C.)Determine the standard deviation of the slope and the intercept. D.) Calculate the concentration of Hg(II) in the…
Chemistry Atomic absorption analysis of Zn gave a calibration best fit line of A=0.670(ppm Zn) The detection limit was determined for this analysis using a 0.020 ppm Zn solution. The standard deviation of the absorbances for 11 samples of the solution was found to be 1.560 x 10-3 and the slope of the calibration curve was 0.026. Calculate the detection limit, Cq, (in units of ppm) for this instrument. Give your answer to 3 places after the decimal place.
A liquid sample was analyzed for Fe³+. A plot of absorbance (y-axis) vs. concentration (ppm; x-axis) of the external standards produced a calibration line with an equation y = 0.2256x -0.0903 (R² = 0.9973). The absorbance of the sample was 1.25. Determine the amount of Fe³+ in the sample (in ppm).
The absorbances of solutions containing K2CrO4 in 0.05 M KOH were measured in a 1.0-cm cell of 375 nm. The following results were obtained: Calculate the linear equation of the calibration curve.
A solution in part C initially contains (4.0300x10^-4) molar SCN¯ and (2.880x10^-3) molar Fe3+. This solution was then measured using the colorimeter, and an absorbance of (4.8600x10^-1) was recorded.The constant determined in part A of the experiment was found to be (3.40x10^3). Using the data provided above, determine the equilibrium constant for the reaction. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: х10 Answer
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.
Atomic absorption spectroscopy with graphite furnace atomization is an extremely sensitive technique. The standard addition method is used with this technique to determine the concentration of copper in urine. A 20.00 mL sample of urine is spiked with 1.00 mL of 300. ppb Cu²+ and this mixture gives a response of 0.168. Another 1.00 mL aliquot of 300. ppb Cu²+ is added to this mixture and gives a reading of 0.235Determine the concentration of copper in the urine sample

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