GB/T 9723-2007Chemical Reagent - General rule for flame atomic absorption spectrometric analysis (English PDF)

Foreword

This standard replaces GB/T 9723-1988 "Chemicals flame atomic absorption spectrometry General." This standard and GB/T 9723-1988 compared to the main changes are as follows.

--- Increasing the normative references (Chapter 2 of this edition);

--- Increased terms and definitions chapter (Chapter 3 of this edition);

--- Modify the reagents and materials (1988 edition, Chapter 4, Chapter 5 of this edition);

--- Supplementary instrument a chapter on the contents (the 1988 edition of Chapter 5, Chapter 6 of this edition);

--- Modify the determination of a chapter in the content, and the elimination of one of the substrate preparation method (the 1988 version of Chapter 6, Article 7 edition chapter);

--- Modify the precision of a chapter (1988 edition, Chapter 7, Chapter 8 of this edition);

--- Modify the security considerations chapter (1988 edition, Chapter 8, edition Chapter 9);

--- Revised Appendix C.

The Standard Annexes A and B are normative appendix Appendix C is informative appendix. The standard proposed by China Petroleum and Chemical Industry Association.

1 Scope

This standard specifies the chemical reagents fire - Requirements and determination methods (air acetylene) by atomic absorption spectrometry instruments.

This standard applies to the determination of chemical reagents section trace impurity elements.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 602 Determination of impurities in chemical reagents prepared standard solution (GB/T 602-2002, ISO 6353-1. 1982, NEQ)

GB/T 603 chemical reagent test method Preparations of articles (GB/T 603-2002, ISO 6353-1 with. 1982, NEQ)

GB/T 4470 flame emission, atomic absorption and atomic fluorescence spectrometry term (GB/T 4470-1998, idt ISO 6955. 1982)

GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)

JJG694 atomic absorption spectrophotometer test procedures

3 Terms and Definitions

GB/T 4470 established the following terms and definitions apply to this standard.

4 Principle of the method

Light radiated from the measured elements characteristic wavelengths of light, the sample vapor produced by flame atomization system, measured by vapor yuan Ground state atomic absorption pigment, under certain test conditions, absorbance (A) the size of the relationship between the concentration of the analyte in the sample meets the light absorption Law, see equation (1). A = logPhi0/Phitr = K · L · Ba (1) Where. Phi0 --- incident light flux; Phitr --- transmission flux;

--- The K absorption coefficient, under certain experimental conditions constant; L --- absorption length;

--- Ba concentration of the analyte.

When the absorption of the optical path length L and the absorption coefficient K is constant, the absorbance A is proportional to the concentration of Ba and measured elements. With this law can be Quantitative analysis.