lassify the statements based on whether they describe the method of standard addition, the method of external calibration,r both.Standard additionExternal calibrationBoth The response of the instrument must be lincar in the sample matrix.Systematic errors can occur due to sample or standard preparation.It consists of a series of standard analyte solutions separate from the unknown.A blank is used to correct the response from the instrument.Known quantities of a standard solution of the analyte are added to the unknown.It is the method of choice when the matrix of the sample may affect the signal.Matrix effects can cause the same analyte concentration in an unknown and standard to give different responses.It is used to measure the instrument response as a function of a known analyte concentration under a set of conditions.

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Answered: lassify the statements based on whether…

lassify the statements based on whether they describe the method of standard addition, the method of external calibration, r both.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter4: Least-squares And Calibration Methods

Section: Chapter Questions

Problem 9P

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Similar questions

are there any points within the linear range of a signal response curve that cannot be used to determine the concentration of analyte in a sample?
An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13.7. What is the sensitivity for the analyte? What is the sensitivity for the interfering? What is the value of the selectivity coefficient? What is the maximum concentration of interferent relative to that of the analyte (i.e. interferent/analyte), if the error in the analysis is to be less than 1%?
An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13.7.
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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.
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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 0.235 (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 25.00 mL. The signal for the spiked sample was found to be 0.502. Calculate the weight percent of analyte in the original sample.
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