| icosahedro- |
| icosanoids |
| ideal adsorbed state |
| ideal chromatography |
| ideal dilute solution |
| ideal gas |
| ideal, non-linear chromatography |
| ideally polarized (electrified) interphase |
| ideally unpolarized (electrified) interphase |
| ideal mixture |
| identity period of a polymer |
| identity reaction |
illuminance,  ,
 quantity |
| image converter tube |
| image dissection tube |
| imaging (photoimaging) |
| imbalance |
| imbibition in colloid chemistry |
| imenes |
| imides |
| imidic acids |
| imidines |
| imidogens |
| imidonium ions |
| imidoyl carbenes |
| imidoyl nitrenes |
| imin |
| imine radical |
| imines |
| iminium compounds |
| imino acids |
| imino carbenes |
| iminooxy (iminoxy) radicals |
| iminoxyl radicals |
| iminyl carbenes |
| iminylium ions |
| iminyl radicals |
| immersional wetting |
| immission in atmospheric chemistry |
| immission dose in atmospheric chemistry |
| immission flux in atmospheric chemistry |
| immission rate in atmospheric chemistry |
| immobile adsorption |
| immobilized phase in chromatography |
| immobilization in biotechnology |
| immobilization by adsorption in catalysis |
| immobilization by inclusion in catalysis |
| immobilized enzyme |
| immune response |
| immunization |
| immunoassay |
| immunochemistry |
| immunogen |
| immunoglobulin (Ig) |
| immunoradiometric assay |
| immunosuppression |
| impaction |
impact parameter,  quantity |
impedance,  quantity |
| impingement |
| impinger |
| imprecision in analysis |
| impregnation in chromatography |
| improved canonical variational transition-state theory
(ICVTST)
|
| impulsive reaction |
| inaccuracy in analysis |
| inchunit |
| incidence in medicinal chemistry |
| incinerator |
| inclusion compound (inclusion complex) |
| incoherent radiation |
| incoherent scattering |
| incoherent structure |
| incongruent reaction |
| increment (for bulk materials and large units) |
| indicated hydrogen |
| indicator (visual) |
| indicator electrode |
| indicator reaction |
| indifferent absorbing ion |
| indifferent electrolyte |
| indirect amplification |
| indirect reaction |
| individual isotherm in surface chemistry |
| individual particle analysis |
individual perception threshold ( )
in atmospheric chemistry |
| induced radioactivity |
| induced reaction |
| inducer in enzyme catalysis |
| induction in enzyme catalysis |
| induction period |
| inductive effect |
| inductomeric effect |
| inductor |
| inelastic collision |
| inelastic scattering |
| inert |
| inert gas |
| inertial defect |
| inertial separator |
| infinite source thickness |
| information theory |
| inherent viscosity of a polymer |
| inhibition |
| inhibitor |
inhibitory concentration ( )quantity |
inhibitory dose ( )quantity |
| inhomogeneity error in spectrochemical analysis |
| initial energy in in situ microanalysis |
| initial rate method |
| initial (final) state correlations |
| initiation |
| initiator |
| injection temperature in chromatography |
| in-laboratory processing in analytical chemistry |
inner electric potential,  quantity |
| inner filter effect |
| inner Helmholtz plane (IHP) |
| inner layer (compact layer) in electrochemistry |
| inner orbital X-ray emission spectra |
| inner salts |
| inner-sphere electron transfer |
| inoculation |
| inositols |
| in-out isomerism |
| input rate in analysis |
| insert in biotechnology |
| insertion |
| in situ microanalysis |
| in situ micro-X-ray diffraction (Kossel-technique) |
| instability (with reference to instrumentation) |
| instantaneous current |
| instantaneous rate of flow in polarography |
| instantaneous (spot) sampling
in atmospheric chemistry |
| instrumental activation analysis |
| instrumental dependability |
| instrumental indication (for a precision balance) |
| integral capacitance of an electrodequantity |
| integral detector in chromatography |
| integrating sphere |
| intended crossing of potential-energy surfaces |
| intensity |
| intensity (relative to base peak)
in mass spectrometry |
| intensive quantity |
| interaction distance |
| intercalation compounds |
| intercalation reaction |
| interchromophoric radiationless transition |
| interconal region |
| interconvertible enzyme |
| interface |
interfacial concentration,  in electrochemistry |
| interfacial double-layer |
| interfacial layer |
interfacial layer width,  in thin films |
| interfacial region |
| interfacial tension |
| interference in analysis |
| interference filter |
| interfering lines |
| interfering substance
in electroanalytical chemistry |
| interferometer |
| interferons |
| intermediate |
| intermediate neutrons |
| intermolecular |
| intermolecular radiationless transition |
internal absorptance,  quantity |
| internal compensation |
| internal conversion |
internal energy,  quantity |
| internal filling solution of a glass electrode |
| internal reference electrode |
| internal return |
| internal standard in chromatography |
| internal surface |
| internal transmittance |
internal valence force field ( ) |
| international calorie |
| International system of units |
| international unit |
interparticle porosity,  in chromatographyquantity |
interparticle volume of the column,
in chromatographyquantity |
| interpenetrating polymer network (IPN) |
| interphase |
| interphase transition |
| interstitial fraction in chromatography |
| interstitial velocity in chromatography |
| interstitial volume in gas chromatography |
| intersystem crossing |
| interval analysis |
| intervalence charge transfer |
| interzonal region |
| intimate ion pair |
| intra- in organic reaction mechanisms |
| intrachromophoric radiationless transition |
| intramolecular |
| intramolecular catalysis |
| intramolecular isotope effect |
| intraphase transition |
intrinsic activation energy,
 quantity |
| intrinsic barrier |
| intrinsic detector efficiency |
| intrinsic full energy peak efficiency |
| intrinsic photopeak efficiency |
| intrinsic viscosity of a polymer |
| intron |
| inverse isotope effect |
| inverse kinetic isotope effect |
| inverse micelle |
| inverse square law in radiation chemistry |
| inversion |
| inversion height in atmospheric chemistry |
| inversion point in phase transitions |
| inverted micelle |
| inverted region (for electron transfer) |
| in vitro |
| in vivo |
| iodohydrins |
| iodometric titration |
| iodonium ions |
| ion |
| ion collector in mass spectrometry |
| ion cyclotron resonance (ICR) mass spectrometer |
| ion energy loss spectra in mass spectrometry |
| ion exchange |
| ion-exchange chromatography |
| ion-exchange isotherm |
| ion-exchange membrane |
| ion exchanger |
| ion-free layer |
| ion pumps |
| ionic concentration |
| ionic conductivityquantity |
| ionic copolymerization |
| ionic dissociation in mass spectrometry |
| ionic polymerization |
| ionic spectral lines |
ionic strength,  quantity |
ionic transport number,  quantity |
| ionization |
| ionization buffer in flame spectroscopy |
| ionization by sputtering |
| ionization chamber |
| ionization cross-section |
| ionization efficiency |
| ionization efficiency curve in mass spectrometry |
ionization energy,
 quantity |
| ionization potential |
| ionizing collision in mass spectrometry |
| ionizing power |
| ionizing radiation |
| ionizing voltage |
| ion kinetic energy spectrum in mass spectrometry |
| ion laser |
| ion microscopy |
| ion/molecule reaction in mass spectrometry |
| ion/neutral species exchange reaction
in mass spectrometry |
| ion/neutral species reaction in mass spectrometry |
| ionogenic groups |
| ionomer |
| ionomer molecule |
| ion pair |
| ion-pair formation in mass spectrometry |
| ion pair return |
| ion probe microanalysis (IPMA) |
| ion radical |
| ion scattering spectrometry (ISS) |
| ion-selective electrode (ISE) |
| ion-selective electrode cell |
| ion source in mass spectrometry |
| ion trap mass spectrometer |
| ionophore |
| ipso-attack |
| iridescent layers |
| iridoids |
| iron-sulfur cluster |
| iron-sulfur proteins |
irradiance,  quantity |
| irradiation |
| irregular macromolecule |
| irregular polymer |
| irreversible transition |
| isoabsorption point |
| isobar in atmospheric chemistry |
| isobaric mass-change determination |
| isobaric separation |
| isobars |
| isoclined structures in polymers |
| isoclinic point |
| isoconfertic separation |
| isocoumarins |
| isocratic analysis in chromatography |
| isocyanates |
| isocyanides |
| isocyclic compounds |
| isodesmic reaction |
| isodiazenes |
| isoelectric |
| isoelectric point in electrophoresis |
| isoelectronic |
| isoemissive point |
| isoentropic |
| isoenzyme |
| isoequilibrium relationship |
| isoflavonoids |
| isoionic |
| isoionic point in electrophoresis |
| isokinetic line in atmospheric chemistry |
| isokinetic relationship |
| isokinetic sampling in atmospheric chemistry |
| isolated double bonds |
| isolobal |
| isomer |
| isomerases |
| isomeric |
| isomeric state in nuclear chemistry |
| isomeric transition in nuclear chemistry |
| isomerism |
| isomerization |
| isomer shift in Mössbauer spectroscopy |
| isometric |
| isomorphous structures in polymers |
| isonitriles |
| isonitroso compounds |
| isooptoacoustic point |
| isopeptide bond |
| isopotential point |
| isoprenes |
| isoprenoids |
| isopycnic |
| isopycnic separation |
| isorefractive |
| isosbestic point |
| isoselective relationship |
| isoselenocyanates |
| isosteric enthalpy of adsorption |
| isostilbic point |
| isotactic macromolecule |
| isotactic polymer |
| isotactic triads in polymers |
| isotherm in atmospheric chemistry |
| isothermal chromatography |
| isothiocyanates |
| isotones |
| isotope dilution |
| isotope dilution analysis |
| isotope effect |
| isotope exchange |
| isotope exchange analysis |
| isotope pattern in mass spectrometry |
| isotopes |
| isotopic abundance |
| isotopically deficient |
| isotopically enriched ions |
| isotopically labelled |
| isotopically modified |
| isotopically substituted |
| isotopically unmodified |
| isotopic carrier |
| isotopic enrichment |
| isotopic enrichment factor |
| isotopic fractionation factor |
| isotopic ion |
| isotopic labelling |
| isotopic molecular ion |
| isotopic scrambling |
| isotopic separation |
| isotopic tracer |
| isotopologue |
| isotopomer |
| isotropic |
| isotropic carbon |
| isotropic pitch-based carbon fibres |
| isoureas |
| isovalent hyperconjugation |
| isozyme |
