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![Page 1: Quality WHAT IS QUALITY Degree of congruence between expectation and realization WHO DEFINITION Quality means meeting the predetermined requirements of.](https://reader036.fdocuments.us/reader036/viewer/2022062301/56649e895503460f94b8de3b/html5/thumbnails/1.jpg)
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Quality
• WHAT IS QUALITY
Degree of congruence between expectation and realization
• WHO DEFINITION
Quality means meeting the predetermined requirements of users for a particular substance or service
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Quality Control
• Testing performed during food or biopharmaceutical manufacturing to verify that appropriate standards of product quality are attained
• The actual organizational group (QC unit) who execute this work
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Quality Control
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Quality Assurance vs. Quality Control
Quality AssuranceAn overallmanagement plan to guarantee theintegrity of data(The “system”)
Quality ControlA series of analytical measurements usedto assess thequality of the analytical data(The “tools”)
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True Value vs. Measured Value
True Value
The known, accepted value of a quantifiable property
Measured Value
The result of an individual’s measurement of a quantifiable property
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Accuracy vs. Precision
AccuracyHow well a measurement agrees with an accepted value
PrecisionHow well a series of measurements agree with each other
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Systematic vs. Random Errors
Systematic ErrorAvoidable error due to controllable variables in a measurement.
Random ErrorsUnavoidable errors that are always present in any measurement. Impossible to eliminate
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Quality Control Measures
• Standards and Calibration• Blanks• Recovery Studies• Precision and Accuracy Studies• Method Detection Limits
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Standards and Calibration• Prepared vs. Purchased Standard• Calibration Curves• Internal Standards• Performance Testing.
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Calibration Curves
Graphical representation of the relationship between:
• The analytical signal
• The concentration of the analyteand
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Internal Standards• A compound chemically similar to
the analyte• Not expected to be present in the
sample• Cannot interfere in the analysis• Added to the calibration standards
and to the samples in identical amounts.
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Internal Standards• Refines the calibration process• Analytical signals for calibration
standards are compared to those for internal standards
• Eliminates differences in random and systematic errors between samples and standards
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Performance TestingBlind samples submitted to laboratories
??
?Labs must periodically analyze with acceptable results in order to maintain accreditation
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Blanks, Blanks, Blanks• Laboratory Reagent Blanks
• Instrument Blanks
• Field Reagent Blanks
• Trip Blanks
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Laboratory Reagent Blanks• Contains every reagent used in the
analysis• Is subjected to all analytical
procedures• Must give signal below detection
limit• Most methods require one with
every batch
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Instrument Blank
• A clean sample (e.g., distilled water) processed through the instrumental steps of the measurement process; used to determine instrument contamination.
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Field Reagent Blanks
• Prepared in the lab, taken to the field
• Opened at the sampling site, exposed to sampling equipment, returned to the lab.
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Trip Blanks• Prepared in the lab, taken to the
field
• Not opened
• Returned to the lab
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Recovery Studies• Matrix Spikes
• Laboratory Control Samples
• Surrogates .
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Matrix Spikes• Sample spiked with a known
amount of analyte• Subjected to all sample prep and
analytical procedures• Determines the effect of the matrix
on analyte recovery• Normally one per batch
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Laboratory Control Sample
Also known as:
• Laboratory Fortified Blank (LFB)• Quality Control Sample (QCS)
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Laboratory Control Sample
• Subjected to all sample prep and analytical procedures
• Analyte spiked into reagent water
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Surrogates
• Similar to an internal standard• Added to all analytical samples,
and to all QC samples to monitor method performance, usually during sample prep
• Methods often have specific surrogate recovery criteria
• Most common in Organic methods
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Method Detection Limit “The minimum concentration of a
substance that can be measured and reported with 99% confidence that the analyte concentration is greater than zero”
N.J.A.C 7:18 - 1.7
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Method Detection Limit
• MDLs are determined according to 40 CFR, part 136, Appendix B
• Seven replicate laboratory control samples, analyzed for precision
• Multiply standard deviation by 3.14 (Student’s t- value)
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Method Detection Limit• Must be performed initially for
certification• Must meet criteria specified in
method• Must be performed with change in
instrumentation or test method• Annually with ELCP