Nature and Scope of Chemical Analysis Flashcards
Application of techniques and methods to obtain and assess qualitative, quantitative, and structural information on the nature of matter.
Analytical Chemistry
Processes providing basis for analytical measurements
Techniques
Detailed set of instructions for particular analysis
Method
Abbreviation
AAS
Atomic Absorption Spectroscopy
Set of written instructions on how to apply the method
Procedure
Set of written guidelines for sample analysis set by an agency
Protocol
What is the characteristic property of this instrumental method?
Kinetic Methods
Rate of reaction
What is the characteristic property of this instrumental method?
Potentiometry
Electrical potential
What is the characteristic property of this instrumental method?
Amperometry, polarography
Electrical current
What is the characteristic property of this instrumental method?
Activation and isotope dilution methods
Radioactivity
What is the characteristic property of this instrumental method?
Coulometry
Electrical Charge
What is the characteristic property of this instrumental method?
Spectroscopy
Absorption of radiation
What is the characteristic property of this instrumental method?
Thermal Gravimetry, DTA, DSC
Thermal characteristics
What is the characteristic property of this instrumental method?
Mass spectrometry
Mass-to-charge ratio
Component of interest in the sample
Analyte
Collection of all components in the sample
Matrix
Collecting sample whose composition represents the bulk material
Sampling
Sample containing all components except the analyte
Blank
Experimental measurement proportional to analyte concentration
Signal
Portion of a solution subjected to analysis
Aliquot
Portions of a sample carried through analytical procedure in the exact same way
Replicates
What are the 2 Central Values?
Mean and Median
A central value not affected by extreme values or outlier
Median
Affected by the presence of extreme values
Mean
aka Arithmetic mean or average
Repeatability of a measurement
Precision
Measure of the agreement between the experimental result and true value
Accuracy
What type of error?
Causes data to be more scattered or less symmetrically around the mean
Random or Indeterminate Error
What type of error?
Causes the mean of a set data to differ from the accepted value
Systematic or Determinate Error
What type of error?
Large and may causes result to be either high or low
Gross Error
