Which is a characteristic of composite samples? a. More prone to erroneous concl

Question

Which is a characteristic of composite samples? a. More prone to erroneous conclusions due to accidentally collecting from a "hot spot" b. Less representative of time and space variations than grab samples c. Frequently require more highly specialized and expensive equipment than grab samples d. Provide an instantaneous and localized picture of the parameter being sampled Which is an example of positive interference? a. Increased concentration of analytes detected due to seepage into a sample through improperly-sealed containers b. Decreased analyte concentrations in a sample due to photochemical decomposition c. Loss of analytes due to volatilization into headspace above a sample d. Lower concentrations of analytes present in the samples due to sorption to the container walls Is it possible to accurately measure a concentration of 0 ug/L of a particular analyte? a. Yes b. No True or False. Quality control is the management program to ensure quality data while quality assurance is the functional procedures and checks used to ensure quality data. a. True b. False Given an analytical group of 60 samples, how many of these should be QA/QC samples? a.6 d. 15

Explanation / Answer

The correct answers for the given questions are as follows:

Question 1) Option d

Question 2) Option a)

Question 3) Yes

Question 4) True

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