ASTM C1605 - 04(2009)

    Standard Test Methods for Chemical Analysis of Ceramic Whiteware Materials Using Wavelength Dispersive X-Ray Fluorescence Spectrometry

    Active Standard ASTM C1605 | Developed by Subcommittee: C21.03

    Book of Standards Volume: 15.02


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    Abstract

    These test methods details the standard procedures for the determination of ten major elements (SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, P2O5, MnO), and LOI in ceramic whitewares clays and minerals using wavelength dispersive X-ray fluorescence spectrometry (WDXRF). Besides the simultaneous X-ray spectrometer, this test procedure shall also need Pt-Au alloy crucibles and molds, fluxers, muffle furnaces with rocker attachments, and hot plate and muffle furnaces. The sample is first ignited, then fused with lithium tetraborate and the resultant glass disc is introduced into a wavelength dispersive X-ray spectrometer. The disc is irradiated with X-rays from an X-ray tube. X-ray photons emitted by the elements in the samples are counted and concentrations determined using previously prepared calibration standards. In addition to the 10 major elements, the method provides a gravimetric loss-on-ignition.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 These test methods cover the determination of ten major elements (SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, TiO2, P2O5, MnO, and LOI in ceramic whitewares clays and minerals using wavelength dispersive X-ray fluorescence spectrometry (WDXRF). The sample is first ignited, then fused with lithium tetraborate and the resultant glass disc is introduced into a wavelength dispersive X-ray spectrometer. The disc is irradiated with X-rays from an X-ray tube. X-ray photons emitted by the elements in the samples are counted and concentrations determined using previously prepared calibration standards. (1) In addition to 10 major elements, the method provides a gravimetric loss-on-ignition.

    Note 1—Much of the text of this test method is derived directly from Major element analysis by wavelength dispersive X-ray fluorescence spectrometry, included in Ref (1).

    1.2 Interferences, with analysis by WDXRF, may result from mineralogical or other structural effects, line overlaps, and matrix effects. The structure of the sample, mineralogical or otherwise, is eliminated through fusion with a suitable flux. Fusion of the sample diminishes matrix effects and produces a stable, flat, homogeneous sample for presentation to the spectrometer. Selecting certain types of crystal monochromators eliminates many of the line overlaps and multiorder line interferences. A mathematical correction procedure (2) is used to correct for the absorption and enhancement matrix effects.

    1.3 Concentrations of the elements in clays and minerals are determined independent of the oxidation state and are reported in the oxidation state in which they most commonly occur in the earths crust.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C242 Terminology of Ceramic Whitewares and Related Products

    C322 Practice for Sampling Ceramic Whiteware Clays

    C323 Test Methods for Chemical Analysis of Ceramic Whiteware Clays


    ICS Code

    ICS Number Code 71.040.50 (Physicochemical methods of analysis)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/C1605-04R09

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