ASTM_D_8234_-_19.pdf

Designation:D823419Standard Test Method forAnions in High Ionic Water by Ion Chromatography usingTandem Suppressed Conductivity and UV Detection1This standard is issued under the fixed designation D8234;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 simultaneous determinationof fluoride(F),nitrite-N(NO2-N),ortho-phosphate-P(o-PO4-P),bromide(Br),nitrate-N(NO3-N),and sulfate(SO4-2)ionsin high saline water(up to 20%sodium chloride(NaCl)bysuppressed ion chromatography and tandem ultra-violet(UV)detection.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionThe inch-pound and SI units shown forpressure measurements are to be individually regarded asstandard.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Flowing ProcessStreamsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.4.Summary of Test Method4.1 This test method measures NO2-N,NO3-N,and Brinpresence of high level concentrations of chloride ion.5.Significance and Use5.1 Ion chromatography provides for both qualitative andquantitative determination of common anions,F,NO2,hy-drogen phosphate ion(HPO42),Br,NO3,and SO42,in themilligram per litre range from a single analytical operationrequiring only a few millilitres of sample for analysis.5.2 Anion combinations such as chloride/bromide(Cl/Br)and nitrite/nitrate(NO2/NO3),which may be difficult todistinguish by other analytical methods,are readily separatedby ion chromatography.6.Interferences6.1 Since chloride and nitrite elute very close together,theypotentially interfere for each other.Low molecular weightorganic acid may interfere with fluoride ion.Selection ofproper analytical column will permit resolution of theseinterfering compounds from fluoride ion.6.2 As with other types of chromatography,if one of thesample components is present at very high levels,it mayinterfere by causing a very large peak on the chromatogramthat could mask other peaks present.This type of interferenceis normally minimized by dilution of the sample and in someinstances may be corrected if the concentration of that anion isof interest.However,care should be taken not to dilute theanalyte concentration below its detectable limit.Use of the UVdetector enables detection of nitrite nitrogen in presence ofhigh concentrations of chloride ion.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved July 1,2019.Published August 2019.DOI:10.1520/D8234-19.2For 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 7.Apparatus7.1 Ion ChromatographThe ion chromatograph shouldhave the components shown in Fig.7.7.2 Eluent and Regenerant Containers.7.3 Eluent Pump,capable of delivering 0.1 to 5 mL/min ofeluent at a pressure of up to 20 000 kPa(4000 psi).7.4 Guard ColumnAnion exchange column,typically ofthe same anion exchange material used in the separatorcolumn.The purpose of this column is to protect the analyticalcolumn