GB/T 5121.26-2008Methods for chemical analysis of copper and copper alloys - Part 26:Determination of mercury content (English PDF)

Foreword

GB/T 5121 "Copper and copper alloy chemical analysis method" a total of 27 sections.

--- Part 1. Determination of copper content;

--- Part 2. Determination of phosphorus content;

--- Part 3. Determination of lead content;

--- Part 4. Carbon, Determination of sulfur content;

--- Part 5. Determination of nickel content;

--- Part 6. Determination of bismuth content;

--- Part 7. Determination of arsenic content;

--- Part 8. Determination of oxygen content;

--- Part 9. Determination of iron content;

--- Part 10. Determination of tin content;

--- Part 11. Determination of zinc content;

--- Part 12. Determination of antimony content;

--- Part 13. Determination of aluminum content;

--- Part 14. Determination of manganese content;

--- Part 15. Determination of cobalt content;

--- Part 16. Determination of chromium content;

--- Part 17. Determination of beryllium content;

--- Part 18. Determination of magnesium content;

--- Part 19. Determination of silver content;

--- Part 20. Determination of zirconium content;

--- Part 21. Determination of titanium content;

--- Part 22. Determination of cadmium content;

--- Part 23. Determination of silicon content;

--- Part 24. selenium, tellurium content was measured;

--- Part 25. Determination of boron content;

--- Part 26. Determination of mercury content;

--- Part 27. Inductively coupled plasma atomic emission spectrometry.

Part is divided into 26 sections.

1 Scope

This section specifies the determination of copper and copper alloy of mercury content.

This section applies to the determination of copper and copper alloy of mercury content. Measurement range. 0.0001% to 0.15%.

2 Principle of the method

Sample mixed acid decomposition, reduction of excess oxidant with hydroxylamine hydrochloride, under acidic conditions, using stannous chloride reduction of divalent mercury into gold Genus mercury.

At room temperature using air as a carrier gas, and the resulting mercury atoms import mercury vapor meter were measured.

3 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

3.1 Sulfate (rho 1.84g/mL) pure class distinctions.

3.2 Nitrate (rho 1.42g/mL) pure class distinctions.

3.3 Hydrochloric acid (rho 1.19g/mL) pure class distinctions.

3.4 Mixed acid. 2 per unit volume of nitric acid (1 + 1) and a unit volume of hydrochloric acid (1 + 1) were mixed.

3.5 Potassium dichromate solution (10g/L).

3.6 Potassium permanganate solution (50g/L).

3.7 Hydroxylamine hydrochloride solution (100g/L).

3.8 Stannous chloride solution (100g/L). Weigh 10.0g stannous chloride, dissolved in 10mL hydrochloric acid (3.3), and transferred to 100mL volumetric flask The diluted with water to volume, and mix.

3.9 Liquid mercury absorption. [KMnO4 (10g/L) and H2SO4 (1.8mol/L) mixed with an equal volume].

3.10 Mercury standard stock solution. Weigh 0.1354g previously dried over phosphorus pentoxide 24h mercury dichloride, dissolved in a little water, and 50mL of nitric acid (3.2), 10mL potassium dichromate solution (3.5), water volume 1000mL, and mix. This solution 1mL containing 100µg mercury (The standard storage solution is valid for five months).

3.11 Mercury standard solution A. Pipette 10.00mL mercury standard stock solution (3.10) in 100mL flask, add 5mL nitric acid (3.2), 1mL potassium dichromate solution (3.5) with water to volume, and mix. This solution 1mL containing 10µg mercury (this is valid for a standard solution month).

3.12 Mercury standard solution B. Pipette 1.00mL mercury standard solution A (3.11) in 100mL flask, add 1mL potassium dichromate (3.5) with water to volume, and mix. This solution 1mL containing 0.1µg of mercury (when treated with existing service).

3.13 Mercury reducer. size is 20mL, 30mL, 80mL, with grinding mouth, reducing bottle equipped with automatic closure float.

3.14 Mercury absorber.

4 Instrument

Intelligent mercury analyzer, with GP3 type mercury lamp.

The following indicators were used in intelligent mercury meter in optimum working conditions, who can be used to achieve.

--- The detection limit. not more than 0.05 x 10^-9g/mL;