Methods for chemical analysis of graphite
WARNING - Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety, health and environmental protection issues related to its use. It is the responsibility of the user to establish appropriate safety and health and environmental protection measures and to ensure compliance with any national regulatory conditions.
1 Scope
This document describes the analytical methods for moisture content, volatile matter, ash content, fixed carbon content, sulfur content, acid-soluble iron content and iron content of graphite products.
This document is applicable to the chemical analysis of natural graphite products.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6679 General rules for sampling solid chemical products
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limit
3 Terms and definitions
No terms and definitions are listed in this document.
4 General requirements
4.1 Samples for chemical analysis obtained in accordance with the sampling method specified in GB/T 6679 shall be packed in plastic bags or ground glass stoppered bottles with a sample size of not less than 50g.
4.2 Except for moisture content determination, the specimens shall be dried to constant weight at 105°C to 110°C for other analysis items.
4.3 The mass of high, medium and low carbon specimens shall be accurate to 0.1 mg, when constant weight is required, the difference between the two values shall not be more than 0.3 mg; the mass of high purity graphite specimens shall be accurate to 0.02 mg, when constant weight is required, the difference between the two values shall not be more than 0.05 mg.
5 Determination of moisture content
6 Determination of volatile matter
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Determination of moisture content
6 Determination of volatile matter
7 Determination of ash content
8 Determination of fixed carbon content
9 Determination of sulfur content
10 Determination of acid-soluble iron
11 Determination of iron content
