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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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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 chloroform andDDT gave signals offor chloroform andfor DDT. An unknown solutioncontaining DDT was placed in avolumetric flask andof chloroform (FM 119.39, densitywere added. After dilution to the mark with solvent, polarographic signals of andwere observed for the chloroform and DDT, respectively. Find the concentration of DDT in the unknown.
Blind Samples: Interpreting Statistics-- The U.S. Department of Agriculture provided homogenized beef baby food samples to three labs for analysis.Results from the labs agreed well for protein, fat, zinc, riboflavin, and palmitic acid. Results for iron were questionable: Lab A, (13); Lab B, (8); Lab C, (3) mg/100 g . Uncertainty is the standard deviation, with the number of replicate analyses in parentheses. Use two separate t tests to compare results from Lab Cwith those from Lab A and Lab B at the 95 % confidence level. Comment on the sensibility of the t test results and offer your own conclusions.
Control chart. A laboratory monitoring perchlorate in urine measured quality control samples made from synthetic urine spiked with. The graph in Boxshows consecutive quality control measurements. Are any troubleshooting conditions from Box 5-2 observed in these data?
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?
What is the difference between an instrument detection limit and a method detection limit? What is the difference between robustness and intermediate precision?
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