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Chapter 5: Q5P (page 114)

What is the difference between a calibration check and a performance test sample?

Short Answer

Expert verified

In a calibration check, the samples are made by the analysts; thus, the concentrations of the analyte being analyzed is known by the analysts. On the other hand, performance test samples (a.k.a. blind samples, quality control samples) are samples that have unknown concentrations to the analysts, because somebody else has prepared them.

Step by step solution

01

The Calibration Check and Performance Test

Calibration Check:

A calibration check is a study of a solution formulated by the analyst for a known concentration of analyte.

It is the analyst's specific form that instruments and procedures are functioning correctly.

Performance test:

When he or she don't know the right answer the performance test is the used to examine the sample is an analysis of a solution formulated by someone other than analyst to contain a known concentration of analyte.

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Most popular questions from this chapter

Internal standard calibration curve. Figure 5-10 is a graph of $A_{x} / A_{s} versus [X] / [S] = (mol % vinyl acetate units) / (mol % ethylene units) = q / p$ in Reaction 5-13.

(d) From the uncertainty $u_{b}$ of the intercept, find the $95 %$ confidence interval for the intercept. Does this interval include the theoretical value of zero?

What is a blank and what is its purpose? Distinguish method blank, reagent blank, and field blank.

Here is a use objective for a chemical analysis to be performed at a drinking water purification plant: "Data and results collected quarterly shall will be used to determine whether the concentrations of haloacetates in the treated water demonstrate compliance with the levels set by the Stage 1 Disinfection By-products Rule using Method $552.2 "$ (a specification that sets precision, accuracy, and other requirements).

Which one of the following questions best summarizes the meaning of the use objective?

(i) Are haloacetate concentrations known within specified precision and accuracy?

(ii) Are thehaloacetates detectable in the water?

(iii) Dothehaloacetate concentrations exceed the regulatory limit?

Standard addition graph. Allicin is a $~ 0.4 wt %$ component in garlic with antimicrobial and possibly anticancer and antioxidant activity. It is unstable and therefore difficult to measure. An assay was developed in which the stable precursor alliin is added to freshly crushed garlic and converted to allicin by the enzyme alliinase found in garlic. Components of the garlic are extracted and measured by chromatography. The chromatogram shows standard additions reported as mg alliin added per gram of garlic. The chromatographic peak is allicin from the conversion of alliin.

(a)The standard addition procedure has a constant total volume. Measure the responses in the figure and prepare a graph to find how much alliin equivalent was in the unspiked garlic. The units of your answer will be mg alliin/g garlic. Find the $95 %$ confidence interval, as well.

(b) Given that $2 mol$ of alliin are converted to $1 mol$ of allicin, find the allicin content of garlic (mg allicin/g garlic) including the $95 %$ confidence interval.

What is the difference between a false positive and a false negative?

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