CHEMICAL EXAMINATION 14 EXPRESSION OF RESULTS 14 FORMS OF NITROGEN 15 AMMONIA NITROGEN 15 DETERMINATION BY DISTILLATION 15 MEASUREMENT OF AMMONIA NITROGEN 16 COMPARISON WITH AMMONIA STANDARDS 16 COMPARISON WITH PERMANENT STANDARDS 17 MODIFICATION FOR SEWAGE 18 DETERMINATION BY DIRECT NESSLERIZATION 19 ALBUMINOID NITROGEN 20 ORGANIC NITROGEN 21 NITRITE NITROGEN 22 NITRATE NITROGEN 23 PHENOLDISULFONIC ACID METHOD 23 REDUCTION METHOD 24 TOTAL NITROGEN 25 OXYGEN CONSUMED 25 RECOMMENDED METHOD 26 OTHER METHODS 27 RESIDUE ON EVAPORATION 29 TOTAL RESIDUE 29 FIXED RESIDUE AND LOSS ON IGNITION 29 SUSPENDED MATTER 30 DETERMINATION WITH GOOCH CRUCIBLE 30 DETERMINATION BY FILTRATION 30 DETERMINATION OF VOLUME 30 FIXED RESIDUE AND LOSS ON IGNITION 30 HARDNESS 30 TOTAL HARDNESS BY CALCULATION 31 TOTAL HARDNESS BY SOAP METHOD 31 TOTAL HARDNESS BY SODA REAGENT METHOD 34 TEMPORARY HARDNESS BY TITRATION WITH ACID 34 NON-CARBONATE HARDNESS BY SODA REAGENT METHOD 34 NON-CARBONATE HARDNESS BY SOAP METHOD 35 ALKALINITY 35 PROCEDURE WITH PHENOLPHTHALEIN 36 PROCEDURE WITH METHYL ORANGE 37 PROCEDURE WITH LACMOID 37 PROCEDURE WITH ERYTHROSINE 37 BICARBONATE 37