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CPC - G01N - 15.04.2013 - page 15WARNING-Not complete, see G01N 21/65G01N 21/66 . . electrically excited, e.g. electroluminescenceG01N 21/67 . . . using electric arcs or discharges ( spark gaps per se H01T )G01N 21/68 . . . using high frequency electric fieldsG01N 21/69 . . . specially adapted for fluids { e.g. molten metal }G01N 21/70 . . mechanically excited, e.g. triboluminescenceG01N 21/71 . . thermally excitedG01N 21/714 . . . { Sample nebulisers for flame burners or plasma burners ( nebulizers per seB05B ) }G01N 21/716 . . . { by measuring the radiation emitted by a test object treated by combustiongases for investigating the composition of gas mixtures }G01N 21/718 . . . { Laser microanalysis, i.e. with formation of sample plasma }G01N 21/72 . . . using flame burnersG01N 21/73 . . . using plasma burners or torchesG01N 21/74 . . . using flameless atomising, e.g. graphite furnacesG01N 21/75 . Systems in which material is subjected to a chemical reaction, the progress or theresult of the reaction being investigated ( systems in which material is burnt in a flameor plasma G01N 21/72 , G01N 21/73 )G01N 21/76 . . ChemiluminescenceBioluminescenceG01N 21/763 . . . { Bioluminescence }G01N 21/766 . . . { of gases }G01N 21/77 . . by observing the effect on a chemical indicatorG01N 21/7703 . . . { using reagent-clad optical fibres or optical waveguides ( using measurement oftotal internal reflection or attenuated total reflection G01N 21/552 ; optical fibresor waveguides per se G02B ) }G01N 21/774 . . . . { the reagent being on a grating or periodic structure }G01N 21/7743 . . . . . { the reagent-coated grating coupling light in or out of the waveguide }G01N 21/7746 . . . . { the waveguide coupled to a cavity resonator }G01N 21/78 . . . producing a change of colourG01N 21/783 . . . . { for analysing gases }G01N 21/79 . . . . Photometric titrationG01N 21/80 . . . . Indicating pH valueG01N 21/81 . . . . Indicating humidityG01N 21/82 . . . producing a precipitate or turbidityG01N 21/83 . . . . Turbidimetric titrationG01N 21/84 . Systems specially adapted for particular applicationsG01N 21/8422 . . { Investigating thin films, e.g. matrix isolation method }G01N 21/8483 . . { Investigating reagent band ( test-element handling not specific to a test methodG01N 33/4875 ; analytical elements specific to chemical analysis of biological