CHAP 1 Flashcards
indicates
the amount of each substance in a
sample.
Quantitative analysis
reveals
the identity of the elements and
compounds in a sample.
Qualitative analysis
are the components of a
sample that are determined.
Analytes
QUANTITATIVE ANALYTICAL METHODS
Gravimetric methods
volumetric method
electroanalytical methods
spectroscopic methods
_____________determine the mass of the analyte or some compound chemically related to it
Gravimetric methods
___________measures
the volume of a solution containing sufficient reagent to react completely with the
analyte
A volumetric method measures
the volume of a solution containing sufficient reagent to react completely with the
analyte
______________________measure electrical properties such as potential,
current, resistance, and quantity of electrical charge
Electroanalytical methods measure electrical properties such as potential,
current, resistance, and quantity of electrical charge
_______________ explore
the interaction between electromagnetic radiation and analyte atoms or molecules or
the emission of radiation by analytes.
Spectroscopic methods explore
the interaction between electromagnetic radiation and analyte atoms or molecules or
the emission of radiation by analytes.
Steps of a typical quantitative analysis
- choosing a method
- acquiring the sample
- processing the sample
- eliminating interferences
- calibrating and measuring concentration
- calculating results
- evaluating results by estimating reliability
The process of continuous measurement and control
feedback system
the cycle of measurement, comparison, and control
feedback loop
are portions of a material of
approximately the same size that
are carried through an analytical
procedure at the same time and in
the same way.
replicate samples or replicates
the
collection of all the components in
the sample containing an analyte.
matrix or sample matrix
is the process of
determining the proportionality
between analyte concentration and a
measured quantity
calibration
it is
a species that causes an error in an
analysis by enhancing or attenuating
(making smaller) the quantity being
measured.
interference or interferent
a material, often an
alkali metal salt, that is mixed
with the sample and heated to
form a fused salt.
flux
assay
the process of
determining how much of a given
sample is the material by its indicated
name
the process of
collecting a small mass of a material whose composition accurately represents the bulk
of the material being sampled
sampling
Chemical grades
- reagent grade
- primary-standard grade
- special-purpose reagent chemicals
