Place the methods listed in the table below in order of increasing sensitivity for thedetection of tellurium (Te). Place the least sensitive first and the most sensitive last.MethodSignal to Noise ratio forTe0.107 ppmFlame Atomic AbsorptionFurnace Atomic AbsorptionHydride Atomic AbsorptionInductively Coupled Plasma Emission0.00020 mg L-10.004 ppb6 ng mL-1

To order the methods by increasing sensitivity for the detection of tellurium (Te), we need to…

Answered: Place the methods listed in the table…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter26: Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 26.32QAP

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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.
The percentage disodium fumarate at 250 nm and 25°C is 19.2% for a 5 x 10-4 M solution in a 1-cm cell. (a) Calculate the absorbance and transmittance of an aqueous solution of the molar absorption coefficient percentage transmittance of a 1.75 x 10-5 M solution in (b) What will be the a 10-cm cell? CS Scanned with CamScanner
7 of 10 > Atomic absorption spectroscopy was used to determine the amount of aluminum in a sample of sunscreen. A blank solution was measured seven times to determine the detection and quantitation limits of the spectrometer. The blank readings were: 0.0073, 0.0082, 0.0110, 0.0101, 0.0102, 0.0098, and 0.0090 AU. Determine the signal at the detection limit and the signal at the limit of quantitation for this method. signal detection limit: signal limit of quantitation: hulu étv 14
Assuming that the sample optical path length is 1 cm, find the molar absorptivity at wavelength 1 for MR- in cm-1 M-1 given the following: Absorbance at wavelength 1 = 0.319 concentration of MR= = 0.064 M concentration of HMR = 0.097 M molar absorptivity of HMR at wavelength 1 = 0.22 cm-1 M-1
Alsorbance Absorbance Absorption Spectrum of CoCl,(aq) Beer's Law Plot of CoCl, at = 560 nm 045 05 04 03 y = 48571x+0j0038 02 200 300 400 T00 S00 005 01 Wavelength inm) Concentration (M) Figure 1: Absorption Profile for cobalt (II) chloride Figure 2: Cobalt (II) chloride standard curve (Beer's Law Plot)* www.ucirvine.instructre.com 2. Place an arrow at the maximum absorbance and extrapolate the wavelength max. Amax = (be sure to include the unit). 3. Determine by concentration of an unknown solution of cobalt (II) chloride having an absorbance of 0.25. Method 1: Extrapolation (mark the concentration on the plot) b. Method 2: Calculation (show your work) a. Life University CHM 111 March 2021
. A sample of cobalt is to be determined using absorption spectrum analysis. A 0.286 g sampleof a cobalt ore is crushed and digested in 1M HNO3. The stock solution is then diluted to 250.0mL in a volumetric flask (assuming the solution has a density = 1.00 g/mL). The analysis thenproceeds as follows: Sample Solution Std Co solution (11.2 ppm) Final Volume Transmittance 15.0 mL 0.00 mL 100.0 mL 54.1% 15.0 mL 5.00 mL 100.0 mL 19.9%Calculate the percent cobalt in the original ore sample.
Copper was determined in an alloy sample by UV-visible spectrophotometry. The standard addition method was used. When exactly 5.0 mL of 1.00 g/L Cu standard solution was added to 100.0 mL of the sample solution, the blank-corrected absorption changed from 0.26 to 0.60. Calculate the concentration of Ču in the sample solution assuming the absorbance was directly proportional to the analyte concentration. A. 0.35 g/L B. 0.26 g/L C. 0.60 g/L D. 1.3 g/L E. 3.0 g/L
The absorption spectra of two colored substances A and B are determined and the following data obtained using 1.00-cm cell: Solution Molarity A450 nm A750 nm A alone 5.0 x 10-4 0.800 0.100 B alone 2.0 x 10-4 0.100 0.600 A + B Unknown 0.600 1.000 1. Using the molarity and absorbance data for the solution containing A alone, calculate the molar absorptivities of A at 450 nm and 750 nm. 2. Using the molarity and absorbance data for the solution containing B alone, calculate the molar absorptivities of B at 450 nm and 750 nm. 3. Calculate the concentrations of A and B in the unknown solution.
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Lithium in a sample is determined by flame emission spectrometry, using a standard additions calibration. 100µL of sample diluted to ImL gives an emission signal of 6.7 units. A similar solution to which 10 uL of a 0.010M solution of LINO; added gives a signal of 14.6 units. Assuming linearity between the emission signal and the lithium concentration, what is the concentration of lithium in the sample in ppm? 5.9 1.7 2.1 1.1 4.6
Concentration ratio given absorbances and plots
5. s) Lithium in blood serum of a manic-depressive patient treated with lithium carbonate is determined by flame emission spectrometry, using standard additions calibration. 100 ul. of serum diluted to I ml gives and emission signal of 6.7 units. A similar solution to which 10 ul of a 0.010 M solution of LINO3 has been added, gives a signal of 14.6 units. Assuming linearity for the signal, what is the concentration in ppm of the lithium in the blood serum?

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