GB/T 5121.17-2008Methods for chemical analysis of copper and copper alloys Part 17:Determination of beryllium content (English PDF)

3.1

copper (mass fraction of greater than 99.99% copper, beryllium mass fraction of less than 0.001%).

3.2

ammonium chloride.

Nitrate 3.3 (rho1.42g/mL).

3.4

hydrochloride (rho1.19g/mL).

3.5

nitric acid (1 + 1).

3.6

HCl (1 + 1).

3.7

Ammonia (rho0.90g/mL).

3.8

Na2EDTA (15g/L).

3.9

Sodium hydroxide (40g/L).

3.10

Congo red.

3.11 Eriochrome cyanine R ammonia buffer solution (4g/L)

Weigh 6.8g of ammonium chloride (3.2) in the 150mL beaker, add 20mL water to

Ammonium chloride dissolved completely, adding 57mL ammonia (3.7), stir until the solution was allowed to room temperature. Was added 0.400g accurate eriochrome cyanine

R, stirring eriochrome cyanine R completely dissolved, the solution is transferred to 100mL volumetric flask, mixing, placing 1h after use (when used with now).

3.12 Beryllium standard stock solution

Weigh accurately 0.1000g metal beryllium (beryllium content of not less than 99.95%) in the 150mL beaker,

Added 10mL of hydrochloric acid (3.6), low heat to dissolve completely. After cooling, the solution is transferred to 1000mL volumetric flask, dilute to the mark with water

Degree, and mix. This solution 1mL containing 100µg beryllium.

3.13 Beryllium standard solution

Pipette 25.00mL Beryllium standard solution (3.12) was placed in 250mL volumetric flask 9mL nitric acid (3.5),

Volume with water and mix. This solution 1mL containing 10µg beryllium.