ASTM_D_8084_-_17.pdf

Designation:D808417Standard Test Method forPhotoelectrochemical Oxygen Demand of FreshwaterSources for Drinking Water Treatment Plants and TreatedDrinking Water1This standard is issued under the fixed designation D8084;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a protocol for the determinationof the photoelectrochemical oxygen demand of freshwatersources for drinking water treatment plants and treated drink-ing water in the range of 0.7 mg/L to 20 mg/L.Higher levelsmay be determined by sample dilution.1.2 Photoelectrochemical oxygen demand is determinedusing the current generated from the photoelectrochemicaloxidation of the sample using titanium dioxide(TiO2)irradi-ated with ultraviolet(UV)light from a light-emitting diode(LED).1.3 This test method does not require the use of thehazardous reagents,such as mercuric sulfate,potassium di-chromate and silver sulfate,that are often associated with thedetermination of chemical oxygen demand(that is,Test Meth-ods D1252).It can also provide a result rapidly,as samples donot require reflux.1.4 Determination of photoelectrochemical oxygen demandin freshwater sources for drinking water treatment plants andtreated drinking water matrices has important implications forassessing treatment efficacy.Photoelectrochemical oxygen de-mand can be used as a bulk surrogate measure of naturalorganic matter,a key target for drinking water treatment.Inaerobic biological treatment processes,determination of pho-toelectrochemical oxygen demand can provide an estimation ofthe oxygen required by microorganisms to degrade organicmatter.This test method is complementary to existing naturalorganic matter(NOM)monitoring techniques and will helpscientists and engineers further the understanding of NOM inwater with a rapid oxygen demand test.1.5 This test method was used successfully with reagentgrade water spiked with pure compounds,freshwater sourcesfor drinking water treatment plants and treated drinking water.It is the users responsibility to ensure the validity of this testmethod for waters of untested matrices.1.6 This test method is applicable to oxidizable matter,50m that can be introduced into the sensor.NOTE1This test method can be performed(1)immediately in thefield or laboratory on an unpreserved sample,and(2)in the laboratory ona properly preserved sample following the stated hold times.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 9.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1252 Test Methods for Chemical Oxygen Demand(Di-chromate Oxygen Demand)of WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.06 on Methods forAnalysis forOrganic Substances in Water.Current edition approved July 15,2017.Published August 2017.DOI:10.1520/D8084-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.Terminology3.1 DefinitionsFor definitions of terms used in thisstandard,refer to Terminology D1129.3.1.1 chemical oxygen demand,nthe amount of oxygenrequired under specified test conditions for the oxidation