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Chapter 5: Q29P (page 117)
State when standard additions and internal standards, instead of a calibration curve, are desirable, and why.
The cause of desirability is described in the below steps
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A solution containing(analyte) and(standard) gave peak areas ofand ,respectively, in a chromatographic analysis. Thenof was added toof unknown,and the mixture was diluted to. This solution gave peak areas ofandforand, respectively.
(a) Calculate the response factor for the analyte.
(b) Find the concentration of
(c) Find the concentration of
(d) Find the concentration of
What is the difference between a false positive and a false negative?
Why is it desirable in the method of standard addition to add a small volume of concentrated standard rather than a large volume of dilute standard?
Internal standard. A solution was prepared by mixing of unknown elementwithof solution containingrole="math" localid="1654777035083" of standard elementper millilitre, and diluting to. The signal ratio in atomic absorption spectrometry was (signal from)/ (signal from. In a separate experiment, with equal concentrations of, (signal fromsignal from. Find the concentration ofin the unknown.
What is the difference between repeatability and reproducibility? Define the following terms: instrument precision, intra-assay precision, intermediate precision, and interlaboratory precision. Which type of precision is a synonym for reproducibility?
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