Reduction of chloride ion interference in chemical oxygen demand (COD) determinations using bismuth-based adsorbents

Autor:	Steve W. Watson, Marc D. Porter, Shelley J. Coldiron, Bikas Vaidya
Rok vydání:	1997
Předmět:	Chemistry Chemical oxygen demand Inorganic chemistry chemistry.chemical_element Sulfuric acid Hydrochloric acid Biochemistry Chloride Analytical Chemistry Catalysis Bismuth chemistry.chemical_compound Adsorption medicine Environmental Chemistry Spectroscopy Masking agent medicine.drug
Zdroj:	Analytica Chimica Acta. 357:167-175
ISSN:	0003-2670
Popis:	An efficient method for the reduction of chloride interference in the determination of chemical oxygen demand (COD) without the use of Hg(II) as a masking agent is described. Chloride ion is removed as hydrochloric acid gas from acidified sample solutions at 150°C in a closed reaction tube and captured by a bismuth-based adsorbent suspended above the heated solution. The effects of adsorbent composition, sulfuric acid concentration, reflux time, chloride concentration, and Ag(I) catalyst on the efficiency of the removal of chloride ion and the COD determination are discussed. The viability of the approach is demonstrated using a wastewater sample.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::af7851cfc598e0fc1cf16785cb7a54ec https://doi.org/10.1016/s0003-2670(97)00541-2 Zobrazit plný text záznamu Full Text from ScienceDirect