ACS Analytical Chemistry Exam
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1. Accuracy Closeness of a measurement to the true value.
2. Precision reproducibility of the measurements under the
same conditions
3. Sensitivity ability to detect small changes in analyte concen-
tration
4. Selectivity Ability to measure analyte without interference.
5. Limit of detection lowest concentration of analyte reliably distin-
guished from the blank.
6. Limit of quantification lowest concentration that can be reliably quanti-
fied.
7. Analyte Substance being analyzed
8. Matrix Sample components other than the analyte.
9. % Relative Standard Deviation (standard deviation/ mean) X 100
10. Calibration curve y=mx + b y= instrument response slope = sensitivity
x = concentration
11. Gravimetric measurements the mass of the analyte or some compound pro-
duced from the analyte was determined.
12. Volumetric measurements involves the determination of the amount of titrant
added to an analyte for a reaction to take place
13. Sampling process of obtaining a representative sample
14. Separation isolating analyte from the matrix
, ACS Analytical Chemistry Exam
Study online at https://quizlet.com/_ihbrql
15. Detection measuring the analyte signal
16. Validation confirming method reliability
17. Robustness method insensitivity to small variations
18. Systematic error consistent deviation from the true value, will always
be in the same direction. Due to some error with
the systems.
19. Random error Unpredictable variation between measurements
that leads to a spread of values about the true val-
ue. Random error can be reduced by taking repeat
measurements.
20. Gross errors the human mistakes in reading instruments and
recording and calculating measurement results
21. Absolute error the absolute value of the difference between the
actual measure of an object and the allowable
measure
22. relative error (absolute/true) x 100
23. Determinate errors Errors that can be identified and corrected.
24. Indeterminate errors random errors, which are incapable of discovery
but which can be treated by statistics
25. t-test
26. Mean average
Study online at https://quizlet.com/_ihbrql
1. Accuracy Closeness of a measurement to the true value.
2. Precision reproducibility of the measurements under the
same conditions
3. Sensitivity ability to detect small changes in analyte concen-
tration
4. Selectivity Ability to measure analyte without interference.
5. Limit of detection lowest concentration of analyte reliably distin-
guished from the blank.
6. Limit of quantification lowest concentration that can be reliably quanti-
fied.
7. Analyte Substance being analyzed
8. Matrix Sample components other than the analyte.
9. % Relative Standard Deviation (standard deviation/ mean) X 100
10. Calibration curve y=mx + b y= instrument response slope = sensitivity
x = concentration
11. Gravimetric measurements the mass of the analyte or some compound pro-
duced from the analyte was determined.
12. Volumetric measurements involves the determination of the amount of titrant
added to an analyte for a reaction to take place
13. Sampling process of obtaining a representative sample
14. Separation isolating analyte from the matrix
, ACS Analytical Chemistry Exam
Study online at https://quizlet.com/_ihbrql
15. Detection measuring the analyte signal
16. Validation confirming method reliability
17. Robustness method insensitivity to small variations
18. Systematic error consistent deviation from the true value, will always
be in the same direction. Due to some error with
the systems.
19. Random error Unpredictable variation between measurements
that leads to a spread of values about the true val-
ue. Random error can be reduced by taking repeat
measurements.
20. Gross errors the human mistakes in reading instruments and
recording and calculating measurement results
21. Absolute error the absolute value of the difference between the
actual measure of an object and the allowable
measure
22. relative error (absolute/true) x 100
23. Determinate errors Errors that can be identified and corrected.
24. Indeterminate errors random errors, which are incapable of discovery
but which can be treated by statistics
25. t-test
26. Mean average
