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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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.
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.
1. State the difference between transmittance, absorbance, molar absorptivity, and fluorescence. Which one(s) is proportional to analyte concentration?
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
A sample of body serum is to be analysed for sodium by flame emission spectroscopy. 1.00cm' aliquot of serum was pipetted into each of two 50.0cm' volumetric flasks. The first flask was diluted to volume with deionised water. The absorbance of this first solution was0.350. To the second flask 10.0 cm' of a 25.0 ppm sodium standard was added and the flask made up to volume with deionised water. The absorbance of this second solution was 0.720.(i) Calculate the concentration of the sodium in the body serum in mg dm-3.
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
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.
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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