Open AccessProceeding Bromometric Phenol Assay without Starch Indicator
Author(s) -
Maadh Qusay Abdulkadir
Publication year - 2017
Publication title -
al-maǧallaẗ al-’irāqiyyaẗ li-l-’ulūm al-ṣaydalāniyyaẗ/iraqi journal of pharmaceutical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.122
H-Index - 1
eISSN - 2521-3512
pISSN - 1683-3597
DOI - 10.31351/vol18iss1pp72-77
Subject(s) - starch , phenol , chemistry , iodine , chloroform , chromatography , sodium thiosulfate , bromine , organic chemistry
In this research, we exclude starch indicator preparation,that is used in official phenol assay method. The liberated iodine, in presence of chloroform, was acting as indicator and titrated with sodium thiosulfate until getting a sharp colorless end point. Similarly, starch was cancelled during both blank and standardization of bromine water solution experiments needed in phenol assay. The results obtained were the same volumes and weights as that achieved using starch with just about 0.03% difference in sample procedure. Finally, this work will enable us to save time, effort, fuel and materials spended in laboratory.
Key word:- Phenol, assay, starch indicator