REDUCTION OF CHLORIDE-ION INTERFERENCE IN CHEMICAL OXYGEN-DEMAND (COD) DETERMINATIONS USING BISMUTH-BASED ADSORBENTS

Authors
VAIDYA B WATSON SW COLDIRON SJ PORTER MD
Citation
B. Vaidya et al., REDUCTION OF CHLORIDE-ION INTERFERENCE IN CHEMICAL OXYGEN-DEMAND (COD) DETERMINATIONS USING BISMUTH-BASED ADSORBENTS, Analytica chimica acta, 357(1-2), 1997, pp. 167-175
Citations number
27
Journal title
Analytica chimica acta → ACNP
ISSN journal
00032670
Volume
357
Issue
1-2
Year of publication
1997
Pages
167 - 175
Database
ISI
SICI code
0003-2670(1997)357:1-2<167:ROCIIC>2.0.ZU;2-H
Abstract
An efficient method for the reduction of chloride interference in the determination of chemical oxygen demand (GOD) without the use of Hg(II ) as a masking agent is described. Chloride ion is removed as hydrochl oric acid gas from acidified sample solutions at 150 degrees C in a cl osed reaction tube and captured by a bismuth-based adsorbent suspended above the heated solution. The effects of adsorbent composition, sulf uric acid concentration, reflux time, chloride concentration, and Ag(I ) catalyst on the efficiency of the removal of chloride ion and the CO D determination are discussed. The viability of the approach is demons trated using st wastewater sample. (C) 1997 Elsevier Science B.V.