4.1 The test methods in this standard are designed to show whether a given material meets the specifications prescribed in Specification C967.

4.2 Because of the variability of matrices of uranium-ore concentrate and the limited availability of suitable reference or calibration materials, the precision and bias of these test methods should be established by each individual laboratory that will use them. The precision and bias statements given for each test method are those reported by various laboratories and can be used as a guideline.

4.3 Instrumental test methods such as X-ray fluorescence and emission spectroscopy can be used for the determination of some impurities where such equipment is available.

1.1 These test methods cover procedures for the chemical and atomic absorption analysis of uranium-ore concentrates to determine compliance with the requirements prescribed in Specification C967.

1.2 The analytical procedures appear in the following order:

Sections

Uranium by Ferrous Sulfate Reduction—Potassium Dichromate
  Titrimetry

 
  9

Nitric Acid-Insoluble Uranium

 10 to 18

Extractable Organic Material

 19 to 26

Determination of Arsenic

 27

Carbonate by CO₂ Gravimetry

 28 to 34

Fluoride by Ion-Selective Electrode

 35 to 42

Halides by Volhard Titration

 43 to 50

Phosphorus by Spectrophotometry

 52 to 60

Determination of Silicon

 61

Determination of Thorium

 62

Calcium, Iron, Magnesium, Molybdenum, Titanium, and Vana-
 dium by Atomic Absorption Spectrophotometry

 
63 to 72

Potassium and Sodium by Atomic Absorption
  Spectrophotometry

 
73 to 82

Boron by Spectrophotometry

83 to 92

1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific precautionary statement is given in Section 7.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.