I need only hand written answer Mass spectral measurements were made on 10 replicate low concentration Ni-EDTA samples: 191.1, 150.8, 160.7, 175.7, 144.7,214.1, 165.7, 170.3, 159.7, and 177.3 counts. Ten measurements of a blank had a mean measurement of 38.3 counts. A samplecontaining 1.00 µM Ni-EDTA gave a measurement of 1739 counts. Estimate the signal and concentration detection limits for Ni-EDTA.99.02countssignal detection limit:0.0714uMconcentration detection limit:Incorrect

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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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The chromium in an aqueous sample was determined by pipetting 10.0 ml. of the unknown into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cr were added to the flasks, following which the solutions were diluted to volume. Unknown,mLStandard, mLAbsorbancc 10.00.00.201 10.010.0 0.292 10.020.0 0.378 10.030.0 0.467 10.040.0 0.554 (a) Plot the data using a spreadsheet. (b) Determine an equation for the relationship between absorbance and volume of standard. (c) Calculate the statistics for the least-squares relationship in (b). (d) I)ctcrmine the conccnt ration oÍCr in ppm in the sample. (e) Find the standard deviation of the result in (d).
Mass spectral measurements were made on 10 replicate low concentration Cd-EDTA samples: 181.5, 148.5, 158.5, 173.5, 142.5, 211.9, 163.5, 168.1, 157.5, and 175.1 counts. Ten measurements of a blank had a mean measurement of 42.1 counts. A sample containing 2.00 µM Cd-EDTA gave a measurement of 1827 counts. Estimate the signal and concentration detection limits for Cd-EDTA. signal detection limit: counts concentration detection limit: µM
Mass spectral measurements were made on 10 replicate low concentration Pb-EDTA samples: 152.7, 114.6, 128.1, 143.1, 112.1, 181.5, 133.1, 137.7, 127.1, and 144.7 counts. Ten measurements of a blank had a mean measurement of 27.7 counts. A sample containing 2.00 µM Pb-EDTA gave a measurement of 1601 counts. Estimate the signal and concentration detection limits for Pb-EDTA. signal detection limit: counts concentration detection limit: µM
Mass spectral measurements were made on 10 replicate low concentration Ni-EDTA samples: 171.7, 119.0, 132.5, 147.5, 116.5, 185.9, 137.5, 142.1, 131.5, and 149.1 counts. Ten measurements of a blank had a mean measurement of 41.5 counts. A sample containing 2.00 µM Ni-EDTA gave a measurement of 1719 counts. Estimate the signal and concentration detection limits for Ni-EDTA. signal detection limit: counts concentration detection limit: µM
Mass spectral measurements were made on 10 replicate low concentration Ni-EDTA samples: 178.9, 141.2, 158.7, 173.7, 1427, 212.1, 163.7, 168.3, 157.7, and 175.3 counts. Ten measurements of a blank had a mean measurement of 32.5 counts. A sample containing 2.00 µM Ni-EDTA gave a measurement of 1693 counts. Estimate the signal detection limit for Ni-EDTA. 167 count 39.4 count 93.4 counts 20.3 count
Inductively coupled plasma–optical emission spectrometry (ICP-OES) was used for the determination of cadmium using indium as an internal standard. A solution containing 2.15 ppm Cd2+ and 5.76 ppm In3+ gave signals of 19,291 and 37,190 counts for cadmium and indium, respectively. A 0.01652 g sample was dissolved in acid and quantitatively transferred to a 250.0 mL volumetric flask. A 1.00 mL aliquot of 264.5 ppm In3+ was added and the flask was diluted to volume with deionized water. ICP-OES analysis of the sample solution gave signals of 31,109 and 118,941 counts for cadmium and indium, respectively. What was concentration of the Cd2+ in the sample? Give answer all questions with explanation
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.
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.
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.
A spectrophotometer method for the quantitative analysis of Pb2+ in blood uses Cu2+ as an internal standard. A standard containing 1.75 ppb Pb2+ and 2.25 ppb Cu2+ yields a signal of 0.832 for Pb2+ and a signal of 0.351 for Cu2+. A sample of blood is spiked with the same concentration of Cu2+, giving a signal of 0.520 for Pb2+ and 0.289 for Cu2+. Determine the concentration of Pb2+ in the sample of blood.
Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.22 ug Co/mL and 2.20 ug Ti/mL measured by AAS produced a signal-to-signal ratio of 2.35 Ti : 1.00 Co. A mixture was prepared by combining 6.00 mL of a Ti(IV) solution of unknown concentration with 4.00 mL.of a 12.4 ug/mL solution of Co(II). The absorbance of the mixture at the Ti(IV) wavelength was 0.104 and the absorbance at the Co(II) wavelength was 0.189. Determine the concentration, in moles per liter, of Ti(IV) in the original unknown solution. concentration: M Ti(IV)
Aa.53.

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