A PHOTOMETRIC TECHNIQUE FOR DETERMINING ZIRCONIUM

A technique for determining zirconium in waste waters of municipal tre atment facilities and flax processing plants in concentrations from of 0.04 to 1.2 mg/liter is described. The reaction of o-nitrophenylfluor one (ONPF) in the presence of cetylpyridinium (CP) chloride is propose d for determining the zirconium. The reaction is selective. Most eleme nts contained in the waste waters of flax plants do not interfere in d etermining zirconium. The interference of Cr(VI) and Fe(In) is exclude d by reducing them to Cr(III) and Fe(II). The limit at which zirconium can be detected is 0.02 mg/liter.