title: Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) — Determination of fluorine content — Alizarin complexone and lanthanum nitrate photometric method
title: Acide phosphorique et phosphates de sodium à usage industriel (y compris les industries alimentaires) — Dosage du fluor — Méthode photométrique au complexone d'alizarine et nitrate de lanthane