ASTM_D_6502_-_10_2015.pdf

Designation:D650210(Reapproved 2015)Standard Test Method forMeasurement of On-line Integrated Samples of Low LevelSuspended Solids and Ionic Solids in Process Water byX-Ray Fluorescence(XRF)1This standard is issued under the fixed designation D6502;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 the operation,calibration,anddata interpretation for an on-line corrosion product(metals)monitoring system.The monitoring system is based on x-rayfluorescence(XRF)analysis of metals contained on membranefilters(for suspended solids)or resin membranes(for ionicsolids).Since the XRF detector is sensitive to a range ofemission energy,this test method is applicable to simultaneousmonitoring of the concentration levels of several metalsincluding titanium,vanadium,chromium,manganese,iron,cobalt,nickel,copper,zinc,mercury,lead,and others in aflowing sample.A detection limit below 1 ppb can be achievedfor most metals.1.2 This test method includes a description of the equipmentcomprising the on-line metals monitoring system,as well as,operational procedures and system specifications.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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.2.Referenced Documents2.1 ASTM Standards:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3864 Guide for On-Line Monitoring Systems for WaterAnalysisD4453 Practice for Handling of High Purity Water SamplesD5540 Practice for Flow Control and Temperature Controlfor On-Line Water Sampling and AnalysisD6301 Practice for Collection of On-Line CompositeSamples of Suspended Solids and Ionic Solids in ProcessWater3.Terminology3.1 Definitions:3.1.1 For definitions of other terms used in this standard,refer to Terminology D1129 and Guide D3864.3.2 Definitions of Terms Specific to This Standard:3.2.1 emission intensity,nthe measure of the amplitude offluorescence emitted by a sample element.3.2.1.1 DiscussionThis measurement is correlated with acalibration curve for quantitative analysis.The emission inten-sity generally is given in units of counts per second(c/s).3.2.2 excitation source,nthe component of the XRFspectrometer,providing the high-energy radiation used toexcite the elemental constituents of a sample,leading to thesubsequent measured fluorescence.3.2.2.1 DiscussionThe excitation source may be an elec-tronic x-ray generating tube or one of a variety of radioisotopesemitting an x-ray line of a suitable energy for the analysis athand.3.2.3 integrated sample,nthe type of sample collected byconcentrating the metal constituents of a water sample using afilter or an ion-exchange resin.3.2.3.1 DiscussionThese samples typically are collectedover long time periods(up to several days).The result ofanalysis of the collection medium yields a single measurement,which,when divided by the total sample volume,is interpretedas the average metals concentration during the time of collec-tion.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of Water.Current edition approved April 1,2015.Published April 2015.Originallyapproved in 1999.Last previous edition approved in 2010 as D6502 10.DOI:10.1520/D6502-10R15.2For 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 States1 3.2.4 ionic solids,nmatter that will pass through a 0.45m filter and may be captured on anion or cation ion-exchangemembranes,or both.3.2.5 suspended solids,nmatter that is removed by a 0.45m filter.3.2.6 x-ray fluorescence(XRF)spectroscopy,nan analyti-cal technique in which sample elements are irradiated by ahigh-energy source to induce a transition from the ground stateto an excited state.3.2.6.1 DiscussionThe excitation source is in the 5 to 50KeV x-ray range.The resulting transition elevates an inner-shell electron to one of several outer shells.The excited