GB/T 5121.21-2008Methods for chemical analysis of copper and copper alloys - Part 21:Determination of titanaum content (English PDF)

3.1

nitric acid (1 + 1).

3.2

sulfate (1 + 1).

3.3

Hydrogen peroxide (1 + 9).

3.4 Titanium standard solution

Weigh 0.1666g previously burned by 950 °C to constant weight and titanium dioxide (excellent pure) after cooling in a dryer,

In a dry 250mL beaker, add 30mL sulfuric acid (rho1.84g/mL), heated to dissolve, when close to dissolve completely, adding 5g

Solubilization of ammonium sulfate, dissolved completely, and cooled to room temperature. Moved into 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL

Containing 100µg titanium.

6.1 Sample

Weigh 0.400g sample (5). Accurate to 0.0001g.

6.2

Determination of the number of

Independent secondary measurement averaged.

6.3 blank test

6.3.1

along with sample blank test with water as a reference measuring absorbance.

6.3.2

Weigh a sample, but without addition of hydrogen peroxide, other steps according to analysis, the solution for the sample solution as reference solution.

6.4 Determination

6.4.1

The sample (6.1) was placed in 150mL beaker, was added 5mL of nitric acid (3.1), cover sheet pan, heated to dissolve completely, in addition to boil

To nitrogen oxides. Washed with a little water table dish and cup wall. Added 10mL sulfuric acid (3.2), low temperature evaporation to take the white smoke of sulfur trioxide, remove

Cooled, washed with water and dish table Beibi.