GB/T 5121.21-1996 Chemical analysis methods for copper and copper alloys - Determination of titanium content

This standard specifies the determination method of titanium content in copper and copper alloys. This standard is applicable to the determination of titanium content in copper and copper alloys. Determination range: 0.050% to 0.30%. GB/T 5121.21-1996 Chemical analysis method for copper and copper alloys Determination of titanium content GB/T5121.21-1996 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Chemical analysis method for copper and copper alloys Determination of titanium contentCopper and copper alloys Determination of titaniumn contentThis standard specifies the method for determining the titanium content in copper and copper alloys. This standard is applicable to the determination of the titanium content in copper and copper alloys. Determination range: 0.050%~~0.30%. 2 Referenced standards
GB/T 5121.211996
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards may be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. G1B1.4-88 Guidelines for standardization work Provisions for the preparation of chemical analysis methods GB1467:78 General principles and general provisions for chemical analysis methods for metallurgical products GB7729-87 General principles for spectrophotometric methods for chemical analysis of metallurgical products 3 Method summary
The sample is dissolved in nitric acid and added to a sulfuric acid solution. Hydrogen peroxide is added to form a yellow complex with titanium. The absorbance is measured at a wavelength of 410nm using a spectrophotometer.
4 Reagents
4.1 Nitric acid (1+1).
4.2 Sulfuric acid (1+1).
4.3 Hydrogen peroxide (1+9).
4.4 Titanium standard solution: Weigh 0.1666g of titanium dioxide that has been calcined to constant weight at 950℃ and cooled in a desiccator. Add 30ml of sulfuric acid (pl.84g/ml) to a 250ml beaker, heat to dissolve it, and when it is almost dissolved, add 5g of ammonium sulfate to assist dissolution. After it is completely dissolved, cool to room temperature. Transfer it to a 1000ml volumetric flask, dilute it to the scale with water, and mix it well. This solution contains 100g of titanium in 1ml.
5 Instruments
Spectrophotometer.
6 Analysis steps
6.1 Sample
Weigh 0.400g of sample. Accurate to 0.0001g. Perform two independent measurements and take the average value. 6.2 Empty test
Approved by the State Administration of Technical Supervision on November 4, 1996 292
Implemented on April 1, 1997
CB/T 5121. 21 — 1996
6.2.1 Carry out an empty test with the sample and measure the absorbance with water as reference. 6.2.2 Weigh a portion of the sample and carry out the analysis according to the steps except that hydrogen peroxide is not added. This is used as the sample reference solution. 6.3 Determination
6.3.1 Place the sample (6.1) in a 150 ml beaker, add 5 ml of nitric acid, cover with a beaker, heat to dissolve it completely, and boil to remove nitrogen oxides. Wash the beaker and the beaker wall with a little water. Add 10mL sulfuric acid, evaporate at low temperature until white sulfur trioxide smoke appears, remove and cool, wash Table III and the cup wall with water
6.3.2 Shake the beaker until most of the crystals are dissolved, heat and boil to clarify the solution, remove and cool. Transfer the solution to a 100mL volumetric flask. Wash the beaker and the table blood with water, combine the washing solution in the volumetric flask, add 2ml. Hydrogen peroxide, dilute with water to the scale, mix well. Let it sit for 10min6.3.3 Transfer part of the solution to a 3cm absorption dish, use the sample reference solution (6.2.2) as a reference, and measure the absorbance at a wavelength of 410nm on a spectrophotometer.
6.3.4 Subtract the absorbance of the blank solution accompanying the sample, and find the corresponding titanium amount from the working curve. 6.4 Drawing of working curve
6.4.1 Transfer 0.2.00, 4.00, 6.00.8.00, 10.00, 12.00mL of titanium standard solution to a 100mL volumetric flask 41. Add 10mL of sulfuric acid and 2mL of hydrogen peroxide, dilute to the mark with water, mix well, and leave for 10 minutes. 6.4.2 Transfer part of the solution to a 3cm absorption III, use the reagent blank as a reference, measure the absorbance at a wavelength of 410nm on a spectrophotometer, and draw a working curve with the titanium content as the horizontal axis and the absorbance as the vertical axis. 7 Expression of analysis results
Calculate the percentage of titanium according to formula (1):
Ti(%) = m × 10-6
Wherein, m,—·Ti content found from the working curve, μg. mWww.bzxZ.net
Mass of the sample, g.
The result is expressed to two decimal places. If the titanium content is less than 0.10%, it is expressed to three decimal places. 8 Allowable difference
The difference between the analysis results of laboratories should not be greater than the allowable difference listed in the following table. Table 2
0.050~0.15
>0.15~0.30
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