Analytical Chemistry: Matrix Spikes and Standard Additions

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What is the advantage of using standard additions in testing?

It helps to assess the precision of the test results

It helps to create a reagent blank for quality control

It helps to evaluate the accuracy of the test results

It helps to identify problems in the testing procedure (correct)

What is the purpose of adding a known concentration of the target analyte to a real sample?

To create a standard addition for quality control

To assess the precision of the test results

To evaluate the accuracy of the test results

To create a matrix spike for accuracy assessment (correct)

What is the purpose of performing duplicates in precision assessment?

To create a control chart for quality control

To perform a matrix spike for accuracy assessment

To evaluate the accuracy of the test results

To assess the precision of the test results (correct)

What is the formula to calculate the Relative Percent Difference (RPD)?

Absolute difference between the two results, divided by the average result, multiplied by 100 Signup and view all the answers

What is the purpose of control charts in quality control?

To graphically represent the results of quality control measures Signup and view all the answers

What is the purpose of performance evaluation (PE) samples?

To analyze samples of known concentration as unknown samples Signup and view all the answers

What is the purpose of handling test items in a laboratory?

To ensure the accuracy of test results Signup and view all the answers

What is the primary goal of quality assurance in an analytical chemistry laboratory?

To ensure the quality of test results Signup and view all the answers

What is an example of a quality control activity in an analytical chemistry laboratory?

Deliverable peer reviews Signup and view all the answers

What is the purpose of maintaining records in a laboratory?

To ensure the validity of test reports Signup and view all the answers

What is an example of a quality assurance activity in an analytical chemistry laboratory?

Process checklist Signup and view all the answers

What is the purpose of a quality manual in a laboratory?

To define the quality system under which the laboratory operates Signup and view all the answers

What type of record is typically maintained in a laboratory?

All of the above Signup and view all the answers

What is the purpose of sub-contracting tests in a laboratory?

To increase the laboratory's capacity Signup and view all the answers

Which of the following is an example of a laboratory procedure?

Fibre analysis Signup and view all the answers

What is the purpose of a quality control system in a laboratory?

To ensure compliance with regulatory requirements Signup and view all the answers

What type of document is used to outline the policies and procedures of a laboratory?

Quality manual Signup and view all the answers

Why is it important to maintain accurate records in a laboratory?