GB/T 5121.25-2008Methods for chemical analysis of copper and copper alloys - Part 25: Determination of boron content (English PDF)

3.1

copper (Cu mass fraction >=99.99%, boron content < 0.0001%).

3.2

sulfate (rho1.84g/mL) pure class distinctions.

3.3

phosphate (rho1.71g/mL) pure class distinctions.

3.4

nitrate (rho1.40g/mL) pure class distinctions.

3.5

hydrochloric acid (rho1.19g/mL) pure class distinctions.

3.6

acetic acid (rho1.05g/mL) pure class distinctions.

3.7 acetic acid - sulfuric acid mixed acid

water cooling, stirring sulfuric acid (3.2) slowly into an equal volume of acetic acid (3.6) in.

3.8 acetic acid - ammonium acetate buffer solution

Weigh 225g of ammonium acetate was dissolved in 400mL of water, 300mL of acetic acid (3.6), the solution was applied

Polypropylene filter to 1000mL volumetric flask, dilute with water to volume, and mix.

3.9 sodium fluoride solution (40g/L)

Store in a polypropylene bottle.

3.10

curcumin acetic acid solution (1.5g/L). Weigh 0.15g of curcumin {[CH3O (OH) C6H3CH = CHCO] 2CH2} in polypropylene

Ene or quartz vessel, add 60mL of acetic acid (3.6) and mix. At 40 °C water bath, stirring constantly. After complete dissolution, cool, and transferred

In 100mL polypropylene volumetric flask, dilute to the mark with acetic acid, and mix.

3.11 boron standard stock solution

Weigh 0.2860g of boric acid (excellent pure), in the 250mL beaker, add about 200mL water dissolve. will

Solution into 500 mL volumetric flask, dilute to the mark, shake. Store in a polypropylene bottle. This solution containing 1 mL

0.100mg boron.

3.12 boron standard solution

Pipette 25.00mL boron standard stock solution (3.11) in 500mL volumetric flask, dilute to the mark, mix uniform. Store in a polypropylene bottle, this solution 1mL containing 5.0µg of boron. The time is now equipped with.

4.1

Spectrophotometer.

4.2

polypropylene or quartz containers, containers with acetic acid (3.6) after rinsed, washed with water and dried.