Chapter 1 Analytical Chem

Accuracy

• The degree to which a measurement conforms to the correct value.

• The consistency of repeated measurements.

• The range of values within which a measurement falls.

• The average of a set of measurements.

Peak Area

• Chromatographic

• Spectroscopic

• Electrophoretic

• Mass Spectrometric

A reduced size of representative sample

• Laboratory sample

• Field sample

• Control sample

• Random sample

Gravimetric

• mass of solution

• weight of precipitate

• volume of solvent

• density of solute

Only few mg to microgram to be taken for analysis

• Analysis sample

• Test specimen

• Measurement unit

• Chemical compound

Helps track and identify errors in a method

• Replicate Samples

• Analyze Data

• Collect Observations

• Review Literature

Sensivity

• Ability to distinguish two different concentrations and is determined by the slope of the calibration curve

• The maximum concentration that can be measured without error

• The ability to detect the presence of a substance regardless of its concentration

• The range of concentrations over which a method is effective

The closeness of agreement of two or more measurements of the same quantity.

• Accuracy

• Precision

• Reliability

• Validity

Representativeness

• Performed only a small portion of the sample

• Includes a diverse range of participants

• Represents the entire population accurately

• Is based on random sampling methods

Multiple Samples

• Identically prepared from another source

• Completely different in composition

• Randomly selected from a population

• Prepared using different methods