Two-method verification of hydrogen peroxide determinations in natural waters

Journal Article · Mon Sep 01 04:00:00 EDT 1986 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00124a043· OSTI ID:5347513

Kieber, R J; Helz, G R

An iodometric titration method is investigated for verifying H/sub 2/O/sub 2/ determinations in natural water matrices. Hydrogen peroxide oxidizes iodide to iodine at pH 4 in the presence of (NH/sub 4/)/sub 6/Mo/sub 7/O/sub 24/ x 4H/sub 2/O. The I/sub 2/ that is generated reacts with an added spike of phenylarsine oxide, the excess of which is titrated with a standardized iodine titrant to an amperometrically determined end point. The difference between titrations with and without the enzyme catalase is proportional to the H/sub 2/O/sub 2/ concentration. The detection limit is estimated to be 0.02 ..mu..M. A previously described independent fluorometric method is in excellent agreement with this method when applied to fresh and saline natural waters containing 0.05-5.00 ..mu..M H/sub 2/O/sub 2/. Demonstration of such agreement can be used for verification purposes in the absence of certified standards.

• Research Organization: Univ. of Maryland, College Park
• OSTI ID: 5347513
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:11; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400104 -- Spectral Procedures-- (-1987)
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMPEROMETRY
CHEMICAL ANALYSIS
DATA
ELEMENTS
EXPERIMENTAL DATA
FRESH WATER
HALOGENS
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
IODINE
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PEROXIDES
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SEAWATER
SPECTROPHOTOMETRY
TITRATION
WATER