ASTM D3082-2015 Standard Test Method for Boron in Water《水中硼含量的标准试验方法》.pdf
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1、Designation: D3082 15Standard Test Method forBoron in Water1This standard is issued under the fixed designation D3082; 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
2、 year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the determination of boron inwater and wastewaters by the curcumin colorimetric-extractionmethod2in concentrations between 0.1 and 1.0 mg/L. Ther
3、ange can be extended by dilution of the sample.1.2 Only dissolved boron is determined. This test methodrequires that the water sample be filtered through a 0.45-mmembrane filter before analysis.1.3 This test method is a colorimetric method that is verysensitive to low concentrations of boron in wate
4、r and requiresa relatively small sample volume for analysis.1.4 Precision and bias were obtained on natural and waste-waters. It is the users responsibility to ensure the validity ofthis test method for waters of untested matrices.1.5 The values stated in SI units are to be regarded asstandard. No o
5、ther units of measurement are included in thisstandard.1.6 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
6、 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D1066 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
7、Practices for Sampling Water from Closed ConduitsD4841 Practice for Estimation of Holding Time for WaterSamples Containing Organic and Inorganic ConstituentsD5810 Guide for Spiking into Aqueous SamplesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analys
8、isE60 Practice for Analysis of Metals, Ores, and RelatedMaterials by SpectrophotometryE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision LiquidsE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible Spectrophotometers3. Terminology3.1 Defin
9、itions:3.1.1 For definitions of terms used in this test method, referto Terminology D1129.4. Summary of Test Method4.1 When a water sample containing soluble boron isacidified with hydrochloric acid and evaporated to dryness inthe presence of curcumin, a red-colored complex called roso-cyanine is fo
10、rmed. This colored product is taken up inisopropyl alcohol and is read spectrophotometrically.5. Significance and Use5.1 Because boron can be both essential and deleterious toplant growth, and because ingestion of large amounts can affectthe central nervous system in humans, a method is required tod
11、etermine its concentration in potable, natural, and wastewa-ters. This test method provides a means of determining theboron concentration of these waters. The holding time for thesamples may be calculated in accordance with Practice D4841.5.2 Boric acid is used for chemical shim control of neutronfl
12、ux in a nuclear reactor. This test method serves to determineif the boron concentration is within acceptable limits.6. Interferences6.1 Nitrate concentrations above 20 mg/L begin to interfere.Hardness levels about 100 mg/L as CaCO3give high resultsbecause of the turbidity caused by the insolubility
13、of thehardness salts in isopropyl alcohol. The turbidity can beeliminated by filtering the final solution through a 0.45-mmembrane filter before reading on the spectrophotometer.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee
14、 D19.05 on Inorganic Constituentsin Water.Current edition approved Feb. 1, 2015. Published March 2015. Originallyapproved in 1972. Last previous edition approved in 2009 as D3082 09. DOI:10.1520/D3082-15.2This test method is similar to, but not identical with that appearing in StandardMethods for Ex
15、amination of Water and Wastewater, 13th Ed., American PublicHealth Association, Washington, DC, pp 6972.3For 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 standard
16、s 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 States16.2 Organic color may be present in the sample that couldaffect absorbance rea
17、dings on the spectrophotometer. If aninterfering organic color is present in the sample, the followingprocedure has been found useful in reducing this interferencefor some matrices. Pipet an appropriate sample aliquot into aplatinum dish (Note 1). Make alkaline to litmus with NaOHsolution (20 g/L) a
18、nd add 3 drops in excess. Evaporate todryness on a steam or hot-water bath. If desired, organicmaterial may be destroyed by ignition from 500 to 550Cbefore proceeding. Allow the platinum dish to cool and acidifywith 5 mL of HCl (1 + 19). Triturate with a rubber policemanto dissolve the residue, pour
19、 the contents into a calibratedcentrifuge tube, wash the platinum dish with 3 or 4 mL ofwater, and add to the centrifuge tube. Dilute to the 10-mLmark. Centrifuge to obtain a clear solution. Perform the samesteps on a reagent blank.NOTE 1Other types of evaporating dishes may be used but must becheck
20、ed. Porcelain or ceramic-type dishes may contain boron-fluxingagents.7. Apparatus7.1 All laboratory ware used in the performance of this testmethod must either be plastic or boron-free.7.2 Hot-Water Bath, with temperature control at 55 6 2C.7.3 Spectrophotometer, suitable for use in the range of 540
21、nm. The photometric practices prescribed in this test methodshall conform to Practice E60. Spectrophotometers shall con-form to Practice E275. Measure absorbance using a 50-mmcell.7.4 Evaporating Dishes, 100 to 150 mL capacity.7.5 ThermometerAn ASTM Gravity Thermometer havinga range from 20 to +102C
22、, as specified, and conforming tothe requirements for Thermometer 12C as prescribed in Speci-fication E2251.8. Reagents and Materials8.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated, all reagents shall conform to thespecifications of the Committee on Analytical Reage
23、nts of theAmerican Chemical Society, where such specifications areavailable.4Other grades may be used, provided it is firstascertained that the reagent is of sufficiently high purity topermit its use without lessening the accuracy of the determi-nation.8.2 Purity of WaterUnless otherwise indicated,
24、referencesto water shall be understood to mean reagent water conformingto Specification D1193, Type I, II, or III water. Type I ispreferred and more commonly used. Type II water wasspecified at the time of round robin testing of this test method.NOTE 2The user must ensure the type of reagent water c
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