Analytical Chemistry & Spectroscopy
60 terms · page 1 of 3
Analyte
The specific substance whose presence or amount is being determined in an analysis.
Analytical Chemistry & SpectroscopyAnalytical Chemistry
The branch of chemistry concerned with identifying substances and determining how much of each is present.
Analytical Chemistry & SpectroscopyAtomic Absorption Spectroscopy
A technique that measures the concentration of a metal from the light its free gaseous atoms absorb.
Analytical Chemistry & SpectroscopyAtomic Emission Spectroscopy
A technique that identifies and quantifies elements from the light their excited atoms emit.
Analytical Chemistry & SpectroscopyBack Titration
A technique in which excess reagent is added and the unreacted portion titrated to find how much reacted with the analyte.
Analytical Chemistry & SpectroscopyBase Peak
The most intense peak in a mass spectrum, assigned an arbitrary relative abundance of 100%.
Analytical Chemistry & SpectroscopyBeer–Lambert Law
The relation stating that absorbance is proportional to concentration and to the path length of the sample.
Analytical Chemistry & SpectroscopyBlank
A sample containing everything except the analyte, measured to correct for background signal.
Analytical Chemistry & SpectroscopyCalibration Curve
A plot of instrument response against known analyte concentration, used to determine unknowns.
Analytical Chemistry & SpectroscopyCarbon-13 NMR
An NMR technique that detects the carbon-13 nucleus to reveal the carbon skeleton of a molecule.
Analytical Chemistry & SpectroscopyChemical Shift
The position of an NMR signal relative to a reference, expressed in parts per million of the operating frequency.
Analytical Chemistry & SpectroscopyChromatography
A family of separation techniques that partition components between a stationary and a mobile phase.
Analytical Chemistry & SpectroscopyChromophore
The part of a molecule responsible for absorbing light at a particular wavelength.
Analytical Chemistry & SpectroscopyColumn Chromatography
A preparative technique in which a mixture is separated by passing it down a vertical column packed with stationary phase.
Analytical Chemistry & SpectroscopyComplexometric Titration
A titration based on the formation of a stable complex between the analyte metal ion and a chelating titrant.
Analytical Chemistry & SpectroscopyConfidence Interval
The range within which the true value of a measured quantity is expected to lie with a stated probability.
Analytical Chemistry & SpectroscopyElectrophoresis
A separation technique in which charged species migrate through a medium under an applied electric field.
Analytical Chemistry & SpectroscopyFingerprint Region
The complex lower-frequency part of an infrared spectrum, below about 1500 cm⁻¹, unique to each compound.
Analytical Chemistry & SpectroscopyFlame Test
A qualitative test in which a sample is heated in a flame and identified by the characteristic colour emitted.
Analytical Chemistry & SpectroscopyFragmentation Pattern
The characteristic set of smaller ions produced when a molecular ion breaks apart in a mass spectrometer.
Analytical Chemistry & SpectroscopyGas Chromatography
A technique for separating volatile compounds carried by an inert gas through a heated column.
Analytical Chemistry & SpectroscopyGas Chromatography–Mass Spectrometry
A hybrid technique in which compounds separated by gas chromatography are identified by a mass spectrometer.
Analytical Chemistry & SpectroscopyGravimetric Analysis
Quantitative analysis based on measuring the mass of a product of known composition.
Analytical Chemistry & SpectroscopyHigh-Performance Liquid Chromatography
A technique in which a liquid mobile phase is pumped at high pressure through a column of very fine stationary phase.