[Improvement of the formaldehyde method of determination of total nitrogen].
D005557:Formaldehyde / Q000494:pharmacology*; D007202:Indicators and Reagents; D009584:Nitrogen / Q000737:chemistry*
D007202:Indicators and Reagents; D005557:Formaldehyde; D009584:Nitrogen
FORMALDEHYDE/pharmacology; INDICATORS AND REAGENTS; NITROGEN/chemistry