Причина отмены These test methods covered 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 was first ignited, then fused with lithium tetraborate and the resultant glass disc was introduced into a wavelength dispersive X-ray spectrometer. The disc was irradiated with X-rays from an X-ray tube. X-ray photons emitted by the elements in the samples were counted and concentrations determined using previously prepared calibration standards. In addition to 10 major elements, the method provided a gravimetric loss-on-ignition.

Formerly under the jurisdiction of Committee C21 on Ceramic Whitewares and Related Products, these test methods were withdrawn in July 2023 in accordance with section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

Реферат

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.

Область применения

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)2 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 earth’s crust.

1.4 Concentration ranges:

Element

Concentration range
(percent)

 

SiO₂

 

0.10

99.0

 

Al₂O₃

 

0.10

58.0

 

Fe₂O₃

 

0.04

28.0

 

MgO

 

0.10

60.0

 

CaO

 

0.02

60.0

 

Na₂O

 

0.15

30.0

 

K₂O

 

0.02

30.0

 

TiO₂

 

0.02

10.0

 

P₂O₅

 

0.05

50.0

 

MnO

 

0.01

15.0

 

LOI (925°C)

 

0.01

100.0

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.