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CPC - G01N - 15.04.2013 - page 36G01N 31/00Investigating or analysing non-biological materials by the use of the chemicalmethods specified in the subgroup ( testing the effectiveness or completeness ofsterilisation procedures without using enzymes or microorganisms A61L 2/28 ; measuringor testing processes involving enzymes or micro-organisms C12Q 1/00 )Apparatus specially adapted for such methodsG01N 31/002 . { Determining nitrogen by transformation into ammonia, e.g. KJELDAHL method }G01N 31/005 . { investigating the presence of an element by oxidation ( G01N 31/12 takesprecedence ) }G01N 31/007 . . { by measuring the quantity of water resulting therefrom ( G01N 31/12 takesprecedence ) }NOTE-The observation of the progress of the reaction specified below by any of themethods specified in groups G01N 3/00 to G01N 3/00 to G01N 29/00 , if thisis of major importance, is dealt with in the group concerned.G01N 31/02 . using precipitation { measuring deposition or liberation of materials from an electrolyteG01N 27/42 }G01N 31/10 . using catalysisG01N 31/12 . using combustion ( G01N 25/20 takes precedence )G01N 31/16 . using titrationG01N 31/162 . . { Determining the equivalent point by means of a discontinuity }G01N 31/164 . . . { by electrical or electrochemical means }G01N 31/166 . . { Continuous titration of flowing liquids }G01N 31/168 . . { Determining water content by using Karl Fischer reagent }G01N 31/18 . . Burettes specially adapted for titration ( burettes in general B01L 3/02 )G01N 31/20 . using micro-analysis, e.g. drop reactionG01N 31/22 . using chemical indicators ( G01N 31/02 takes precedence )G01N 31/221 . . { for investigating pH value }G01N 31/222 . . { for investigating moisture content }G01N 31/223 . . { for investigating presence of specific gases or aerosols ( G01N 31/221 , G01N31/222 take precedence; actuation of fire alarm by presence of smoke or gasesG08B 17/10 ) }G01N 31/224 . . . { for investigating presence of dangerous gases }G01N 31/225 . . . { for oxygen, e.g. including dissolved oxygen }G01N 31/226 . . { for investigating the degree of sterilisation }G01N 31/227 . . { for nitrates or nitrites }G01N 31/228 . . { for peroxides }G01N 31/229 . . { for investigating time/temperature history }