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Chapter 5: Q32P (page 117)
Internal standard calibration curve. Figure 5-10 is a graph of in Reaction 5-13.
(d) From the uncertaintyof the intercept, find theconfidence interval for the intercept. Does this interval include the theoretical value of zero?
Theconfidence interval for the intercept
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Detection limit. A sensitive chromatographic method was developed to measure sub-part-per-billion levels of the disinfectant by-products iodate, chlorite, and bromatein drinking water. As the oxyhalides emerge from the column, they absorption at. For example, each mole of bromate makes by the reaction
Bromate near its detection limit gave the following chromatographic peak heights and standard deviations (s). For each concentration, estimate the detection limit. Find the mean detection limit. The blank is 0 because chromatographic peak height is measured from the baseline adjacent to the peak. Because blank =0, relative standard deviation applies to both peak height and concentration, which are proportional to each other. Detection limit is 3 s for peak height or concentration.
What is the difference between a false positive and a false negative?
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 (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?
How can you validate precision and accuracy?
Standard addition. An unknown sample of gave a current of in an electrochemical analysis. When of solution containing role="math" localid="1654761474124" was added to of unknown, the current increased to .
(a) Denoting the initial, unknown concentration as , write an expression for the final concentration, , after role="math" of unknown were mixed with of standard. Use the dilution factor for this calculation.
(b) In a similar manner, write the final concentration of added standard , designated as .
(c) Findin the unknown.
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