SN/T 1732.3-2014Pyrotechnic composition used for fireworks and firecracker. Part 3: Determination of zincum content (English PDF)

Foreword

SN/T 1732 "with fireworks pyrotechnic" is divided into 13 parts.

--- Part 1. Determination of barium content;

--- Part 2. Determination of dichromate;

--- Part 3. Determination of zinc content;

--- Part 4. Determination of copper content;

--- Part 5. Determination of titanium content;

--- Part 6. Determination of strontium content;

--- Part 7. Determination of lead content;

--- Part 8. Determination of sodium content;

--- Part 9. Determination of magnesium content;

--- Part 10. Determination of sulfur content;

--- Part 11. Determination of potassium content;

--- Part 12. Determination of red phosphorus content;

--- Part 13. Determination of boric acid content.

This section SN/T 1732 Part 3.

This section drafted in accordance with the rules of GB/T 1.1-2009 and GB/T 20001.4-2001 given.

The partial replacement of SN/T 1732.3-2006 "with fireworks Pyrotechnic Part 3. Determination of zinc content," in addition to editorial modifications Outside the main technical changes are as follows.

--- In the foreword of the provisions, the increase in the standard preparation of the drafting of the rules are based;

--- Modify the "Normative references" the key words (see 2);

--- Modify the scope of this section will be applicable from the scope "This section applies to fireworks pyrotechnics with zinc content measured Set "to" This section applies to pyrotechnic fireworks with zinc content of more than 1% of the measured "(see Chapter 1);

--- Combined principle and reaction section;

--- Modify the sample size, the "Weigh about 5g sample" to "Weigh about 2g ~ 5g sample" (see 7.1).

This section proposed and managed by the National Certification and Accreditation Administration Committee.

This section is drafted. North Exit Inspection and Quarantine.

1 Scope

SN/T 1732 This section specifies the method of pyrotechnic fireworks with zinc content determination.

This section applies to pyrotechnic fireworks with zinc content of more than 1% of the measurement.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

Preparation of GB/T 601 chemical reagent standard titration solution Laboratory use specifications and test methods GB/T 6682 Analysis GB/T 8170 repair value expressed about the rules and limit values and judgment GB/T 15813-1995 Fireworks forming agent sample separation and crushing Principle 3 Sample after pretreatment with a dilute nitric acid to dissolve sufficiently, filtered, adjusting the pH of the sample solution, adding a precipitating agent to zinc ions in the test solution points from out complexometric titration with EDTA at pH6.0 conditions xylenol orange as indicator solution, titration test standard titration solution of zinc chloride Liquid from yellow to orange is the end.

Zn2 H2Y2- = ZnY2- 2H Sr2 SO42- = SrSO4 (down) Ba2 SO42- = BaSO4 (down) Al3 6F - = (AlF6) 3-

4 Reagents

Unless otherwise indicated in the analysis using only confirm at least three water analytical grade reagents and GB/T 6682 stipulated.

4.1 ethanol.

4.2 acetone.

4.3 Ammonia (13).