GB/T 6730.53-2004 in English

《GB/T 6730.53-2004铁矿石 锌含量的测定 火焰原子吸收光谱法》由TC317（全国铁矿石与直接还原铁标准化技术委员会）归口，主管部门为中国钢铁工业协会。
本标准规定了火焰原子吸收光谱法测定铁矿石中锌含量。本标准适用于天然铁矿石、铁精矿和块矿，包括烧结产品中锌含量的测定。测定范围(质量分数)0．001％～0．5％。

1 Scope

This Standard specifies the determination of the zinc content in the iron ores by the flame atomic absorption spectrometric method.
This Standard is applicable to the determination of zinc content in the natural iron ore, iron ore concentrates and agglomerates, including sintered product, with the determination scope (mass fraction) of 0.01%~0.5%.

2 Normative References

The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrigendum), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Standard are encouraged to study whether the latest editions of these documents apply. For undated references, the latest editions apply.
GB/T 6682 Water for Laboratory Use – Specifications (neq ISO 3697: 1987)
GB/T 6730.1 Methods for Chemical Analysis of Iron Ores - Preparation of Predried Test Samples for Chemical Analysis (idt ISO 7764: 1985)
GB/T 10322.1 Iron Ores - Sampling and Sample Preparation Procedures (idt ISO 3082: 1998)
GB/T 12806 Laboratory Glassware - One-mark Volumetric Flask (neq ISO 1042: 1983)
GB/T 12808 Laboratory Glassware - One-mark Pipette (neq ISO 648: 1977)

3 Principle

The sample is decomposed with hydrochloric acid and hydrofluoric acid to remove the silicon dioxide and oxidize the nitric acid. The salts are dissolved with hydrochloric acid, and filtered. The residue is melted with sodium carbonate after being charred and burnt. The melt is leached in the hydrochloric acid and the residue recovery solution is reserved.

Foreword I
1 Scope
2 Normative References
3 Principle
4 Reagents and Materials
5 Apparatus
6 Sampling and Sample Preparation
7 Analysis Procedures
8 Calculation of Results
9 Test Report
Appendix A (Normative) Flowsheet of the Procedure for the Acceptance of Analysis Values of the Sample
Appendix B (Informative) Derivation of Repeatability and Permissible Tolerance Equations
Appendix C (Informative) Precision Data Obtained by International Analytical Trials