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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

Detection limit. In spectrophotometry, we measure the concentration of an analyte by its absorbance of light. A low-concentration sample was prepared and nine replicate measurements gave absorbances of 0.0047,0.0054,0.0062,0.0060,0.0046,0.0056,0.0052,0.0044, and 0.0058. Nine reagent blanks gave values of 0.0006,0.0012, 0.0022,0.0005,0.0016,0.0008,0.0017,0.0010, and 0.0011.

a) Find the absorbance detection limit with equation 5-3.

b) The calibration curve is a graph of absorbance versus concentration. Absorbance is a dimensionless quantity. The slope of the calibration curve is m=2.24x104M-1Find the concentration detection limit with Equation 5-5.

(c) Find the lower limit of quantitation with Equation 5-6.

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

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?

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?

Chloroform is an internal standard in the determination of the pesticide DDT in a polarographic analysis in which each compound is reduced at an electrode surface. A mixture containing 0.500mMchloroform and0.800mMDDT gave signals of15.3μAfor chloroform and10.1μAfor DDT. An unknown solution(10.0mL)containing DDT was placed in a100-mLvolumetric flask and10.2μLof chloroform (FM 119.39, density=1.484g/mL)were added. After dilution to the mark with solvent, polarographic signals of and8.7μAwere observed for the chloroform and DDT, respectively. Find the concentration of DDT in the unknown.
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