On the basis of the chromatography results shown here: what is the percentage radiochemical purity of the mTc-pentetate preparation? Origin 3 μCi HR-Tc System 1 System 2 275 μCi 99m Tc-pentetate + HR-Tc Solvent front 177 μCi 99m Tc-pentetate +99m TcO 15 µCi 99mTCO4 what is the percentage radiochemical purity of the 99m Tc-pentetate preparation?

On the basis of the chromatography results shown here: what is the percentage radiochemical purity of the mTc-pentetate preparation? Origin 3 μCi HR-Tc System 1 System 2 275 μCi 99m Tc-pentetate + HR-Tc Solvent front 177 μCi 99m Tc-pentetate +99m TcO 15 µCi 99mTCO4 what is the percentage radiochemical purity of the 99m Tc-pentetate preparation?

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter1: Introduction

Section: Chapter Questions

Problem 1.9QAP

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An atomic absorption method for the determination of the amount of iron present in used jet engine oil was found from pooling 30 triplicate analyses to have a standard deviation s = 3.1 µg Fe/mL. If s is a good estimate of o, calculate the 95 and 99% confidence intervals for the result 21.7 µg Fe/mL if it was based on the following criteria. (a) a single analysis 95% confidence interval= 21.7 + 99% confidence interval = 21.7 + (b) the mean of two analyses 95% confidence interval = 21.7 + 99% confidence interval= (c) the mean of six analyses 21.7 ± 95% confidence interval = 21.7 + 99% confidence interval= 21.7 + μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL μg Fe/mL
What is the key equation for spectrometry experiments? O q rxn = -q_cal %3D O d=m/V O A= ebC O at endpoint, mol acid = mol base
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A student researcher measured the cadmium (Cď*) content in a standard reference material (SRM) using graphite furnace atomic absorption spectrometry (GFAAS). With 7 replicate measurements, the researcher determined a mean Cd+ concentration of 3.127 ppb with a standard deviation of 0.006 ppb. Calculate the 98% confidence interval for this sample. A list of values can be found in the Student's 1 table. 3.127 ppb± ppb
A 10.00-g sample containing an analyte was transferred to a 250-mL volumetric flask and diluted to volume. When a 10.00-mL aliquot of the resulting solution was diluted to 25.00 mL it was found to give a signal of o.235 (arbitrary units). A second 10.00-mL aliquot was spiked with 10.00 mL of a 1.00- ppm standard solution of the analyte and diluted to 25.0o mL. The signal for the spiked sample was found to be o.502. Calculate the weight percent of analyte in the original sample.
In the process of performing a spectrophotometric determination of Fe, an analyst prepares a calibration curve using a single-beam spectrometer, such as a Spec-20. After preparing the calibration curve, the analyst drops the cuvette used for the method blank and the standards. The analyst acquires a new cuvette, measures the absorbance of the sample, and determines the %w/w Fe in the sample. Will the change in cuvette lead to a determinate error in the analysis? Explain.
Q5. Two methods were used to measure fluorescence lifetime of a dye. The average result for Method 1 is = 1.382 ns with a standard deviation of s1 = 0.039 and n1= 7. The average result for Method 2 is = 1.346 ns with a standard deviation of s2 = 0.015 and n2= 5. Is there a difference between the two methods at the 95% confidence level using F test?
Drinking water with negligible lead content was fortified with 2.28 µg Pb(II)/L. Triplicate measurements yielded a mean of 1.90 µg Pb(II)/L and a standard deviation of 0.2 µg Pb(II)/L. Find the percent recovery of the spike. 100 percent recovery: % Incorrect
The amount of ascorbic acid in cashew juice of different brands was determined by two different methods, colorimetry and titrometry. The results obtained for the two methods for analyzing the different cashew juice are necessary in the following table. Sample Colorimetry (mg/100g) Titrometry (mg/100g) juice brand A 152,2 153,7 juice brand B 150,7 150,7 juice brand C 18,7 18,7 juice brand D 67,4 67,4 Can the two methods be used, indistinctly, to determine ascorbic acid in cashew juice, at a 95% confidence level? Explain.
3. The lead in a swab sample, lead standards, together with a blank were made up in 5.00 mL volumetric flasks using 0.2 % HNO3. 20 μL aliquots of these solutions were injected into the spectrophotometer and the absorbance measured at 217 nm. The following results were obtained. lead / ppb Absorbance 0 0.0591 10.00 0.0858 50.00 0.1926 100.0 0.3260 150.0 0.4594 200.0 0.5929 Swab sample 0.3700 (a) Determine the amount of lead in the swab sample in μg.
6 A solid product obtained from the reaction of solutions of mercuric nitrate and potassium bromide yielded the following mass spectral data. Identify the compound and assign all masses in the spectrum according to isotopic content. Intensity Intensity m/e 366 364 363 362 361 360 359 358 357 356 354 2.2 11.9 4.2 12.2 10.0 21.2 10.1 11.25 5.8 3.45 0.05 m/e 285 283 282 281 280 279 278 277 275 81 79 0.6 3.2 1.1 4.6 2.6 2.9 1.5 0.9 0.1 17.0 17.3
Ine density Calculate the molarity of solution prepared by weighing 6.34 g of NaOH using a balance with a standard deviation of ± 0.05 g and dissolving it in a 500 mL of water in a volumetric flask with a standard deviation of ± 0.2 mL.