Warning: 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.
1 Scope
This standard specifies the method for determination of total fluorine in coal by oxygen bomb combustion-ion selective electrode method.
This standard is applicable to determination of total fluorine in coal containing 25% ash or less.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB 474 Method for Preparation of Coal Sample
GB/T 483 General Rules for Analytical and Testing Methods of Coal
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and Results—Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method
GB/T 6682 Water for Analytical Laboratory Use—Specification and Test Methods
ASTM E 144 Standard Practice for Safe Use Of Oxygen Combustion Bombs
3 Summary of Test Method
Total fluorine is determined in this test method by combusting a weighed coal sample in an oxygen bomb with a dilute base absorbing the fluorine vapors. The bomb is rinsed into a beaker with water to mix with the absorption solution and following the addition of a citrate buffer, the total fluorine is determined by fluoride ion selective electrode.
