1、Designation: D8084 17Standard 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
2、 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 phot
3、oelectrochemical 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 photoele
4、ctrochemicaloxidation 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 associ
5、ated 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 matric
6、es 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 dema
7、nd 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 tes
8、t.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 met
9、hod is applicable to oxidizable matter, 90 % of a 20 A baselineOutput from the UV LED during referenceoxidation50 mAUV wavelength 365 nmD8084 178ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of
10、this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five
11、years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical com
12、mittee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1
13、9428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 179
