ASTM_D_1068_-_15.pdf

Designation:D106815Standard Test Methods forIron in Water1This standard is issued under the fixed designation D1068;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These test methods cover the determination of iron inwater.Procedures are given for determining total iron,dis-solved iron,and ferrous iron.Undissolved iron may becalculated from the total iron and dissolved iron determina-tions.The test methods are given as follows:RangeSectionsTest Method AAtomic Absorption,Direct0.1 to 5.0 mg/L7 to 16Test Method BAtomic Absorption,Graphite Furnace5 to 100 g/L17 to 26Test Method CPhotometricBathophenanthroline g/L40 to 1000 g/L27 to 381.2 It is the users responsibility to ensure the validity ofthese test methods to waters of untested matrices.1.3 The chelation-extraction and two former photometrictest methods were discontinued.See Appendix X2 for histori-cal information.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.5 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.Specific hazardsstatements are given in Note 4,11.7.1,and X1.1.2.2.Referenced Documents2.1 ASTM Standards:2D858 Test Methods for Manganese in WaterD1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1687 Test Methods for Chromium in WaterD1688 Test Methods for Copper in WaterD1691 Test Methods for Zinc in WaterD1886 Test Methods for Nickel in WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD3558 Test Methods for Cobalt in WaterD3559 Test Methods for Lead in WaterD3919 Practice for Measuring Trace Elements in Water byGraphite Furnace Atomic Absorption SpectrophotometryD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5673 Test Method for Elements in Water by InductivelyCoupled PlasmaMass SpectrometryD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water AnalysisE60 Practice for Analysis of Metals,Ores,and RelatedMaterials by SpectrophotometryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 total recoverable iron,na descriptive term relatingto the iron forms recovered in the acid-digestion procedurespecified in these test methods.4.Significance and Use4.1 Iron is the second most abundant metallic element in theearths crust and is essential in the metabolism of plants andanimals.If presented in excessive amounts,however,it formsoxyhydroxide precipitates that stain laundry and porcelain.Asa result,the recommended limit for iron in domestic watersupplies is 0.3 mg/L.These test methods are useful fordetermining iron in many natural waters.1These test methods are under the jurisdiction of ASTM Committee D19 onWater and are the direct responsibility of Subcommittee D19.05 on InorganicConstituents in Water.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1949.Last previous edition approved in 2010 as D1068 10.DOI:10.1520/D1068-15.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where suchspecifications are available.3Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent wate