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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5 What is the atomic number of a neutral atom that has 8 neutrons and 7 electrons? a. 15b. 8c. 7d. 1 6 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solid
Explain why graphite furnace atomisers provide enhanced sensitivity over flame atomisers in AAS measurements.
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
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
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.
Flame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Provide appropriate discussion to determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.
A spectrophotometric method for the analysis of iron has a linear calibration curve for standards of 0.00, 5.00, 10.00, 15.00, and 20.00 ppm. An iron ore sample with an expected iron content of 40–60% w/w is to be analyzed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum of concentrated HCl, and diluted to 1 L in a volumetric flask using distilled water. A 5.00-mL aliquot is removed with a pipet. To what volume (10, 25, 50, 100, 250, 500, or 1000 mL) should it be diluted to minimize the uncertainty in the analysis? Explain.
Which of the following statement is incorrect? The quality of grating of the monochromator affects the resolution of two closely spaced wavelengths in a spectrum. OICP (Inductively coupled plasma) is commonly used in atomic emission spectrometry. Cuvette is generally used for atomic absorption spectrometry (AAS) as the sample cell. The measurement in fluorescence spectrometry is generally more sensitive than absorption spectrometry.
(i) The detection of Mn by graphite furnace atomic absorption spectrometry (GFAAS) is sensitive to the presence of aluminium ions Al3+ which may form refractory compounds such as MnAl2O4. Comment on the possible impact of this compound on the measurements and what action may be taken to minimize this. (ii) Write a brief note on the best practice for the preparation of a calibration curve. (iii) Atomic absorption spectroscopy (AAS) is a powerful technique for the analysis of trace amounts of metals. Describe the two common atomic absorption methods used in the lab with reference to their comparative strengths and weaknesses.
The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…
The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…
A molecular exclusion column has a diameter of 7.8 mm and a length of 30 cm. The solid portion of the particles occupies 20% of the volume, the pores occupy 40%, and the volume between particles occupies 40%. (a) At what volume would totally excluded molecules be expected to emerge? (b) At what volume would the smallest molecules be expected? (c) A mixture of polymers of various molecular masses is eluted between 23 and 27 mL. What does this imply about the retention mechanism for these solutes on the column?

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