ASTM D2332-2013 Standard Practice for Analysis of Water-Formed Deposits by Wavelength-Dispersive X-Ray Fluorescence《用波长色散X射线荧光法作水沉积物分析标准操作规程》.pdf

1、Designation: D2332 13Standard Practice forAnalysis of Water-Formed Deposits by Wavelength-Dispersive X-Ray Fluorescence1This standard is issued under the fixed designation D2332; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the

2、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 practice covers X-ray spectrochemical analysis ofwater-formed deposits.1.2 The practice is applicable to

3、the determination ofelements of atomic number 11 or higher that are present insignificant quantity in the sample (usually above 0.1 %).1.3 The values stated in SI units are to be regarded asstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its

4、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:2D887 Practices for Sampling Water-Formed DepositsD1129 Terminology Relati

5、ng to WaterD1193 Specification for Reagent WaterE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3. Terminology3.1 For definitions of terms used in this practice, refer toTerminology D1129.4. Summary of Practice4.1 The sample or its fusion with a suitable flux is powderedand the powde

6、r is compacted (mounted). The mount is thenirradiated by an X-ray beam of short wavelength (high energy).The characteristic X rays of the atom that are emitted orfluoresced upon absorption of the primary or incident X raysare dispersed, and intensities at selected wavelengths aremeasured by sensitiv

7、e detectors. Detector output is related toconcentration by calibration curves or charts.4.2 The K spectral lines are used for elements of atomicnumbers 11 to 50. Whether the K or L lines are used for theelements numbered 51 or higher depends on the availableinstrumentation.5. Significance and Use5.1

8、 Certain elements present in water-formed deposits areidentified. Concentration levels of the elements are estimated.5.2 Deposit analysis assists in providing proper water con-ditioning.5.3 Deposits formed from or by water in all its phases maybe further classified as scale, sludge, corrosion produc

9、ts, orbiological deposits. The overall composition of a deposit orsome part of a deposit may be determined by chemical orspectrographic analysis; the constituents actually present aschemical substances may be identified by microscope or X-raydiffraction studies. Organisms may be identified by micro-

10、scopical or biological methods.6. Apparatus6.1 Sample Preparation Equipment:6.1.1 Fusion Crucibles, prepared from 25-mm (1-in.)commercial-grade graphite rods. The dimensions shall be 29mm (118 in.) high, an inside diameter of 19 mm (34 in.), and acavity 22 mm (78 in.) deep.6.1.2 Pulverizers, includi

11、ng an agate or mullite mortar andpestle, minimum capacity 25 ml.6.1.3 SievesNo. 100 (150-m) and No. 270 (53-m) asspecified in Specification E11.6.1.4 CompactorsA press, equipped with a gauge en-abling reproducible pressure, is recommended.6.2 Excitation Source (X-ray Tube):6.2.1 Stable Electrical Po

12、wer Supply (61 %).6.2.2 Source of high-intensity, short-wave-length X rays.6.3 Sample Housing (Turret).1This practice is under the jurisdiction of ASTM Committee D19 on Water andis the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits, Analysis of Water for Powe

13、r Generation and Process Use,On-Line Water Analysis, and Surveillance of Water.Current edition approved Jan. 1, 2013. Published February 2013. Originallyapproved in 1965. Last previous edition approved in 2008 as D2332 08. DOI:10.1520/D2332-13.2For referenced ASTM standards, visit the ASTM website,

14、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 States16.4

15、 SpectrometerBest resolution of the spectrometer andbest sensitivity are not simultaneously attainable; a compro-mise is effected to give adequate values for each.6.4.1 Collimating System.6.4.2 Spectrogoniometer.6.4.3 Analyzing Crystal and HolderThe choice of theanalyzing crystal is made on the basi

16、s of what elements mustbe determined; for example, a gypsum or an ammoniumdihydrogen phosphate crystal can be used for determiningmagnesium but lithium fluoride is much superior for copperand iron (high-intensity diffracted secondary rays and conse-quently greater sensitivity and potential precision

17、). A salt,sodium chloride (NaCl), crystal is frequently employed forgeneral use, being applicable over a broad range and producingintense lines and medium broadening.6.4.4 Counter-Tube Support.6.5 Evacuating or Flushing System.6.6 Measuring System:6.6.1 Detector (of which the principal types are the

18、 Geigercounter, scintillation counter, and flow-proportional counter).6.6.2 Amplifiers (Including Preamplifier), Rate Meter,Recorder, Scaler, and Printout.6.6.3 Zeroing, Gain, and Sequence Controls.7. Reagents7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise i

19、ndicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to

20、 permit its use without lessening theaccuracy of the determination.7.2 Purity of WaterReference to water that is used forreagent preparation, rinsing or dilution shall be understood tomean water that conforms to the quantitative specifications ofType I or II reagent water of Specification D1193.7.3

21、Detector Gas, usual composition 90 % argon, 10 %methane (other compositions are used); usually used withflow-proportional counter for lines of longer wavelength (0.2nm or greater).7.4 Gallium Oxide, spectrographic grade (frequently used asa convenient internal standard).7.5 Helium Gas, commercial gr

22、ade, for the spectrometerflushing system, when vacuum or air paths are not used.7.6 Sodium and Lithium Borates(Na2B4O7and Li2B4O7),commonly used as fluxes for the sample.8. Sampling8.1 Collect the sample in accordance with Practices D887.9. Preparation of Sample9.1 Reduce the entire sample of deposi

23、ts to about 100 g(drying, degreasing, and crushing if necessary) and grind thissubsample to a powder that will pass a No. 100 (150-m) sieve.9.2 Mix the powdered sample thoroughly and remove about10 g for X-ray fluorescence testing (Note 1). Fuse a weighedamount with a weighed amount of a suitable fl

24、ux (2 to 10 g offlux/g of sample) to present a reproducible surface compositionto the X-ray beam.NOTE 1At least semiquantitative results can be obtained more quicklyby compacting (mounting) the test portion (9.3 and 9.4) and proceeding inaccordance with Sections 10, 11, and 12. The decrease in sampl

25、epreparation will actually result in improved accuracy in some instances.9.3 Grind not more than 10 g of the material prepared forX-ray analysis (sample or fusion) to pass a No. 270 (53-msieve).9.4 Make duplicate wafers (or suitable mounts for theparticular equipment that will be used) by compacting

26、 thepowdered sample (precision and accuracy are improved bybriquetting).An internal standard is frequently added by fusionto the material to be compacted. Some samples may require abinder (generally organic and added in minimum concentra-tion) for reproducible packing and a smooth surface.10. Prepar

27、ation of Apparatus10.1 Follow the manufacturers instructions for the initialassembly, conditioning, and preparation of the fluorescentX-ray apparatus.10.2 Follow the manufacturers instructions with respect tocontrol settings.11. Excitation and Exposure11.1 Position the mounted sample in the special

28、chamberprovided for this purpose; avoid touching or otherwise con-taminating the sample surface. Produce and record the spec-trum at the setting or settings recommended for the instrument.Prepare and analyze duplicate mounts for all samples (makeduplicate readings on each mount).11.2 Radiation Measu

29、rementsMake radiation measure-ments for each component of concern using Table 1 as a guideto the frequencies of interest.NOTE 2See also Bureau of Mines Information Circular No. 7725,which lists the 2-theta values for characteristic spectral lines when usingthe analyzing crystals NaCl, lithium fluori

30、de (LiF), and quartz.12. Calibration and Standardization12.1 Semiquantitative evaluations of the concentration ofeach component may be obtained directly by reference tostandardization curves prepared from data obtained by expos-ing samples containing known quantities of these components.12.2 More ac

31、curate evaluations can be made by preparingspecial standards containing the same components as thesample in the ratios indicated by the semiquantitative determi-nations. These special standards can frequently be used to3Reagent Chemicals, American Chemical Society Specifications, AmericanChemical So

32、ciety, Washington, DC. For Suggestions on the testing of reagents notlisted by the American Chemical Society, see Annual Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,M

33、D.D2332 132calculate correction factors for the calibration curves to mini-mize interference effects of the other components of thesample.12.3 Internal standards may be used to provide directcomparison.13. Analytical Values13.1 Average the results obtained for each component fromat least two exposur

34、es of each mounted sample. Use theseaveraged values to read estimated concentrations from pre-pared calibration curves, charts, or tables.14. Statistical Values14.1 Precision of InstrumentThe precision of the instru-ment shall be determined from replicate measurements (10 to20) on a single prepared

35、sample without moving the sample.This precision shall be reported as the standard deviation of theinstrument and is obtained as the usual square root of thesummated deviations squared divided by 1 less than thenumber of replicate measurements.14.2 Precision of TechniqueCalculate the standard devia-t

36、ion of the method from duplicate measurements on 10 to 20samples over at least 3 days, removing and resetting the samplebefore each new series of measurements. The standard devia-tion of this technique is the square root of the summateddeviations squared divided by 4 times the number of analyses.14.

37、3 Coefficient of variation of the practice is obtained bymultiplying the standard deviation by 100 and dividing by theaverage concentration in percent.15. Precision and Bias15.1 A precision and bias statement is not applicable. Referto Sections 12 and 14 for estimation of element concentrationand ev

38、aluation of instrument-specific precision.16. Keywords16.1 deposits; elemental analysis; scale; X-ray fluorescenceASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly adv

39、ised 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 years andif not revised, either

40、 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 committee, which you may attend. I

41、f 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 19428-2959,United States. Indivi

42、dual 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 fr

43、om the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Emission Spectra and Recommended CrystalsElement Recommended CrystalAWave-lengthBAluminum gypsum 8.320Calcium lithium fluoride 3.353Copper lithium fluoride 1.539Iron lithium fluoride 1.934Lead lithium fluoride 1.172BMagnesium gypsum 9.869Phosphor

44、us pentaerythritol tetraacetate 6.142Potassium lithium fluoride 3.735Silicon pentaerythritol tetraacetate 7.111Sodium potassium acid phthalate 11.885Sulfur pentaerythritol tetraacetate 5.362Zinc lithium fluoride 1.434AUpdated to June, 1964; a production instrument, equipped with mountedcrystals, might conveniently use lithium fluoride, pentaerythritol tetraacetate, andpotassium acid phthalate.BEmission wavelengths in kX units (1 kX unit = 1.002 ); the wavelength for leadis the L alpha-1 line and the others are averages of the K alpha-1 and -2 lines.D2332 133