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Standard Test Method for Determination of Hydrogen Peroxide and Combined Organic Peroxides in Atmospheric Water Samples by Peroxidase Enzyme Fluorescence Method
Automaticky preložený názov:
Štandardná skúšobná metóda pre stanovenie peroxidu vodíka a kombinovanej organické peroxidy v Atmospheric Vzorky vody zo strany enzýmu peroxidáza fluorescenčných
NORMA vydaná dňa 1.10.2013
Označenie normy: ASTM D6363-98(2013)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2013
Kód tovaru: NS-34831
Počet strán: 6
Približná hmotnosť: 18 g (0.04 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
atmospheric water, derivatization, hydrogen peroxide, hydroperoxide, peroxide, sampling, ICS Number Code 13.060.50 (Examination of water for chemical substances)
Significance and Use | ||||||||||||
5.1 Hydrogen peroxide (formed photochemically in the atmosphere) is a primary oxidizer of dissolved sulfur dioxide in atmospheric water. Detection of H2O2 in atmospheric water is useful for inferring gas-phase H2O2 concentrations and for assessing the relative importance of various acidifying mechanisms under specific atmospheric conditions. 5.2 Hydroperoxides in samples to be analyzed are unstable in water and can decay rapidly due to bacterial action or chemical reaction with other constituents. The test method includes procedures for sample derivatization and methods for estimating and correcting for hydroperoxide decay. |
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1. Scope | ||||||||||||
1.1 This test method covers the determination of hydroperoxides, which include hydrogen peroxide (H2O2) and combined organic peroxides, in samples of atmospheric water by the method of horseradish peroxidase derivatization and fluorescence analysis of the derived dimer.1.2 The range of applicable hydrogen peroxide concentrations was determined to be 0.6 - 176.0 × 10−6 M from independent laboratory tests of the test method. 1.3 The primary use of the test method is for hydrogen peroxide, but it may also be used to quantitate organic hydroperoxides. Determinations of organic hydroperoxide concentration levels up to 30 × 10−6 M may be adequately obtained by calibration with hydrogen peroxide.1.4 Because of the instability of hydroperoxides in atmospheric water samples, proper sample collection, at-collection derivatization, and stringent quality control are essential aspects of the analytical process. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||
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