This standard specifies the determination method of copper oxide content in direct zinc oxide. This standard is applicable to the determination of copper oxide content in direct zinc oxide. Determination range: 0.0005～0.010%. GB/T 4372.3-2001 Chemical analysis method of direct zinc oxide Determination of copper oxide content by atomic absorption spectrometry GB/T4372.3-2001 Standard download decompression password: www.bzxz.net

GB/T4372.3--2001
This standard is a revision of GB/T4372.3-1984 "Zinc Oxide (Direct Method) Chemical Analysis Method Bicyclohexanone Oxalate Photometric Determination of Copper Oxide Content". The main content of the revision is the determination of copper oxide content by atomic absorption spectrometry. This standard complies with:
GB/T1467-1978 General Principles and General Provisions of Metallurgical Product Chemical Analysis Method Standard GB/T7728--1987 General Principles of Flame Atomic Absorption Spectrometry for Chemical Analysis of Metallurgical Products GB/T17433-1998 Basic Terminology for Chemical Analysis of Metallurgical Products This standard will replace GB/T4372.3-1984 from the date of implementation. Appendix A of this standard is a reminder appendix. This standard is proposed by China Nonferrous Metals Industry Association. This standard is under the jurisdiction of China Nonferrous Metals Industry Standard Metrology and Quality Research Institute. This standard is drafted by Shuikoushan Mining Bureau. The main drafters of this standard are Kuang Haiyan, Yao Xiaohong, Mao Yanling and Tan Husheng. The National Technical Committee for Standardization of Nonferrous Metals is entrusted with the interpretation of this standard. 119
1 Scope
National Standard of the People's Republic of China
Chemical analysis method of zinc oxide produced by direct process
Determination of copper oxide content by atomic absorption spectrometry
Methods for chemical analysis of zinc oxide produced by direct process- Determination of copper oxide content---Atomic absorption spectrometry method This standard specifies the method for determining the copper oxide content in zinc oxide produced by direct process. GB/T 4372.3-2001
Replaces GB/T 4372.3-1984
This standard is applicable to the determination of copper oxide content in zinc oxide produced by direct process. Determination range: 0.0005% to 0.010%. 2 Method Summary
The sample is dissolved in nitric acid. In a dilute nitric acid (5+95 medium, an air-acetylene flame is used to measure the absorbance of copper at a wavelength of 324.8nm on an atomic absorption spectrometer. The content of copper oxide is calculated using the standard curve method. 3 Reagents
3.1 Nitric acid (1+1).
3.2 Copper standard stock solution: Weigh 0.1000g of pure copper (99.99%) in a 300mL beaker, add 10mL of nitric acid (3.1), heat at low temperature to dissolve, boil to drive off nitrogen oxides, cool, transfer to a 1000mL volumetric flask, dilute to the mark with water, and mix. This solution contains 0.1 mg in 1ml. Copper.
3.3 Copper standard solution: Pipette 10.00mL of copper standard storage solution (3.2) into a 100mL volumetric flask, add 5mL of nitric acid (3.1), dilute to scale with water, and mix. This solution contains 10μg of copper in 1mL. 4 Instruments
Atomic absorption spectrometer with copper hollow cathode lamp. Under the best working conditions of the instrument, any instrument that can meet the following indicators can be used. Sensitivity: In a solution consistent with the matrix of the sample solution to be measured, the characteristic concentration of copper should not exceed 10μg. Greater than 0.035μg/mL. Precision: When the absorbance is measured 10 times with the highest concentration standard solution, the standard deviation should not exceed 1.0% of the average absorbance; when the absorbance is measured 10 times with the lowest concentration standard solution (not the zero standard solution), the standard deviation should not exceed 0.5% of the average absorbance of the highest concentration standard solution.
Linearity of working curve: Divide the working curve into five sections according to concentration. The ratio of the absorbance difference of the highest section to the absorbance difference of the lowest section should not be less than 0. 7.
For instrument working conditions, see Appendix A (indicative appendix). Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on July 10, 2001 120
Implemented on December 1, 2001
5 Analysis steps
Weigh the sample according to Table 1, accurate to 0.0001g. Mass fraction of iron oxide, %
0. 000 5~~ 0. 001
>0. 001~ 0. 005
>0. 005 ~~0. 010
5.2 Blank test
Carry out a blank test with the sample.
5.3 Determination
GB/T 4372. 3--2001
Test material quantity·g
Measurement volume,mL
5.3.1 Place the test material (5.1) in a 150mL beaker, add 5mL nitric acid (3.1), cover with surface blood, place on a hot plate to dissolve with slight heat, after complete dissolution, remove and cool, blow water to wash the surface blood and the wall of the beaker, transfer to a 50mL volumetric flask, dilute with water to the scale and mix. 5.3.2 Use air-acetylene flame at the wavelength of 324.8nm of the atomic absorption spectrometer, adjust to zero with water, and measure the absorbance of the test solution. Subtract the absorbance of the blank test solution from the measured absorbance, and find the corresponding copper concentration from the working curve. 5.4 Drawing of working curve
5.4.1 Take 0, 2.00, 4.00, 6.00, 8.00, 10.00mL of copper standard solution (3.3) and place them in a set of 100mL volumetric flasks respectively, add 10mL of nitric acid (3.1), dilute to the scale with water, and mix well. 5.4.2 Under the same conditions as the test sample solution, measure the absorbance of the series of standard solutions. Draw the working curve with the copper concentration as the horizontal axis and the absorbance (minus the absorbance of the zero concentration solution) as the vertical axis. 6 Expression of analysis results
Calculate the mass fraction of copper oxide according to formula (1): w(Cu0) = c:V×10- ×1. 2518 ×100m
Wherein: w(CuO)bzxz.net
7 Allowable difference
Mass fraction of copper oxide, %;
Copper concentration obtained from the working curve, μug/mL; Volume of the measured solution, mL;
Mass of the sample, g;
Coefficient for converting copper into copper oxide.
The difference in analysis results between laboratories should not be greater than the allowable difference listed in Table 2. Table 2
Mass fraction of copper oxide
0. 000 5~~ 0. 001 0
>0. 001 0~0. 003 0
>0. 003 0~ 0. 006 0
>0. 006 0~ 0. 010 0
>0. 010 0~~0. 030 0
>0. 030 0~0. 050 0
Allowable difference
(1)
GB/T4372.3--2001
Appendix A
(Suggestive Appendix)
Instrument working conditions
The reference working conditions of GGX-5 atomic absorption spectrometer are shown in Table A1: Table A1
Wavelength, nm
Lamp current·mA
Monochromator passband, nm
Air flow, L/min
B flow, L/min
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