QUESTION 21 Can the MRecovery of a sample come larger than 100, if the analysis is carried under the internasi standard formalism? (mutiple answers) yes, if there were air bubbles in the volumetric pipette(s) when the standard stock solutions were transferred to the common volumetric flask, for the preparation of the combined standard for injection. yes, if the injector of the HPLC system was unreliable and it injected irreproducible volumes of standard and sample yes, if the HPLC vials were kept un-capped, so that their content evaporated at different rates between the time they were placed in the tray of the HPLC system and the time of the injections. yes, if the final volume of sample or of combined standard for injection was inaccurately brought to the mark of the volumetric flask yes, if the standard preparation was less concentrated than required by the protocol, due to errors in weighing the standard materials a weaker sta make all samples quantitated against if look stronger. standard would yes, if there was incomplete dissolution of the solid sample in the preparation of the sample stock solution yes, if we blame errors that ocurred before the internal standard substance arrived in any of the preparations yes, if the stock sample solution was kept uncovered and the solvent evaporated, thus concentrating the stock sample solution
QUESTION 21 Can the MRecovery of a sample come larger than 100, if the analysis is carried under the internasi standard formalism? (mutiple answers) yes, if there were air bubbles in the volumetric pipette(s) when the standard stock solutions were transferred to the common volumetric flask, for the preparation of the combined standard for injection. yes, if the injector of the HPLC system was unreliable and it injected irreproducible volumes of standard and sample yes, if the HPLC vials were kept un-capped, so that their content evaporated at different rates between the time they were placed in the tray of the HPLC system and the time of the injections. yes, if the final volume of sample or of combined standard for injection was inaccurately brought to the mark of the volumetric flask yes, if the standard preparation was less concentrated than required by the protocol, due to errors in weighing the standard materials a weaker sta make all samples quantitated against if look stronger. standard would yes, if there was incomplete dissolution of the solid sample in the preparation of the sample stock solution yes, if we blame errors that ocurred before the internal standard substance arrived in any of the preparations yes, if the stock sample solution was kept uncovered and the solvent evaporated, thus concentrating the stock sample solution
Chapter24: Introduction To Spectrochemical Methods
Section: Chapter Questions
Problem 24.28QAP
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Transcribed Image Text:QUESTION 21
Can the %Recovery of a sample come larger than 100%, if the analysis is carried under the intermasi stardard formalism? (multiple answers)
yes, if there were air bubbles in the volumetric pipette(s) when the standard stock solutions were transferred to thye common volumetric flask, for the
preparation of the combined standard for injection.
yes, if the injector of the HPLC system was unreliable and it injected irreproducible volumes of standard and sample
yes, if the HPLC vials were kept un-capped, so that their content evaporated at different rates between the time they were placed in the tray of the HPLC system
and the time of the injections.
yes, if the final volume of sample or of combined standard for injection was inaccurately brought to the mark of the volumetric flask.
yes, if the standard preparation was less concentrated than required by the protocol, due to errors in weighing the standard materials, a weaker standard would
make all samples quantitated against if look stronger.
yes, if there was incomplete dissolution of the solid sample in the preparation of the sample stock solution
yes, if we blame errors that ocurred before the internal standard substance arrived in any of the preparations
yes, if the stock sample solution was kept uncovered and the solvent evaporated, thus concentrating the stock sample solution
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