HG/T 2879.1-1997 Determination of total copper content of clay in rubber compound
Some standard content:
HG/T2879.11997
This standard is a method standard, equivalent to the national standard ISO5795-1:1988 "Rubber Compounds-Clay" Part 1 Appendix D (Determination of Total Copper Content-Atomic Absorption Spectrometry). The main technical differences between this standard and ISO5795-1:1988 are: this standard adds four chapters: "Scope", "Reference Standards", "Sampling" and "Test Report".
Appendix D of ISO5795-1:1988 stipulates the use of whatruanNO.40 medium-speed ashless filter paper, this standard stipulates the use of medium-speed ashless filter paper,
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China, and this standard is under the jurisdiction of the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry; this standard is drafted by the Carbon Black Industry Research and Design Institute of the Ministry of Chemical Industry; the main drafters of this standard are Xue Xu, Yu Lian, Hu Bingbi, HG/T 2879.1—1997
ISO beforebZxz.net
ISO (International Organization for Standardization) is a worldwide joint organization of national standard groups (ISO member groups). The work of formulating international standards is often carried out by ISO technical committees. Any member group interested in a certain profession of an established technical committee has the right to participate in the committee. International organizations of various governmental or non-governmental institutions that have contact with ISO can also participate in this work. In all electrical technical standards, ISO works closely with the International Electrotechnical Commission (IEC). Before the international standard is adopted by the ISO Council, the technical committee will send the draft international standard to each member group for voting. According to ISO requirements, at least 75% of the member groups must vote in favor of it before it can be formally adopted. The international standard ISO5795-1 was formulated by ISO/TC45 Rubber and Rubber Products Standardization Technical Committee. The general standard of ISO5795 is entitled Rubber compounding ingredients-kaolin, which includes the following three parts: - Part 1: Test methods (non-rubber tests) - Part 2: Rubber tests
- Part 3: Technical requirements
Appendices A to F are the components of ISO5795, the first edition of which was published in 1988,
ICS83. 040. 20
Registration No. 451-1997
Chemical Industry Standard of the People's Republic of China
Rubber compounding ingredients-kaolin-kaolin-Determination of total copper content 1 Scope
HG / T 2879. 1 -- 1997
eqy ISO 5795-1: 1988
1. 1 This standard specifies the determination of the total copper content of rubber compound clay by atomic absorption spectrometry. 1.2 This standard is applicable to the determination of the total copper content of natural clay for rubber compounding, and can also be used for the determination of the total copper content of other industrial natural clays.
1.3 This standard is applicable to the determination of the total copper content of natural clay that has been chemically treated with acid-neutralizing substances (such as amines) during the production process.
1.4 This standard is not applicable to the determination of the total steel content of natural clay that has been surface-modified (such as silane-treated). 1.5 This standard is not applicable to the determination of the total copper content of natural clay that has been calcined. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T6682-92 Specifications and test methods for water used in analytical laboratories (eg, ISO3696:1987) GB/T1053089 Rubber compounding agent - Precipitated hydrated dihydrogen silica - Packaging, transportation, sampling and acceptance 3 Principle
Treat the soil sample with perchloric acid and hydrofluoric acid to dissolve most of the sample, then use sodium carbonate to melt the insoluble matter, mix the melt with the acid-treated dissolution wave to obtain an overall solution, and use an atomic absorption spectrometer to determine the total copper content of the sample at a wavelength of 324.5nm.
4 Reagents
All reagents are analytically pure, and the test water complies with the provisions of GB/T6682, 4.1 Perchloric acid 60% (m/m),
4.2 Nitric acid p=1. 42 Mg/m,
4.3 Hydrofluoric acid 40% (m/m).
4.4 Hydrochloric acid 36% (m/m) p=1.18 Mg/m24.5 Anhydrous sodium carbonate.
4.6 Copper standard solution: 1000mg/dm2
In a suitable beaker, dissolve more than (1.000±0.001) high purity chips in a mixture containing 10 cm2 water and 5 cm2 nitric acid (4.2), boil to eliminate nitrogen oxides, then cool and transfer to a 1000cm volumetric flask and dilute to the scale with water. 1cm3 of this standard solution contains 10004g of steel
Ministry of Chemical Industry of the People's Republic of China Approved on April 21, 1997, implemented on October 1, 1997
4.7 Copper standard solution: 50mg/dm
HG/ T 2879.1—1997
Use a pipette to transfer 50.0 cm2 of copper standard solution (4.6) into a 1000 cm volumetric flask, add 5 cm2 of nitric acid (4.2), then dilute to the mark with water and shake well,
1 cm This standard solution contains 50 μg of sodium.
4.8 Copper standard solution: 10 mg/ dm2
Use a pipette to transfer 50.0 cm2 of copper standard solution (4.7) into a 250 cm volumetric flask, add 1 cm2 of nitric acid (4.2). Then dilute to the mark with water and shake well.
1cm2 The standard solution contains 10g of copper,
5 Apparatus
Conventional laboratory instruments and
5.1 Crucible with a capacity of 50cm2~75cm2
5.2 Atomic absorption spectrometer with a copper lamp
5.3 Ethylene bottle (with screw cap) with a capacity of 250cm2 and 1dm2 respectively5.4 Meker blowtorch or similar blowtorch, used to melt sodium carbonate and sample when the temperature reaches 900C, and used for the next step of burning when the temperature reaches 1100C.
5.5 Platinum glass, 20cm2, with platinum cover and platinum stirring rod (length 50mm). 5. Check the constant temperature in the drying oven: it can be controlled at 105 billion ± 2. 7.6 Sampling
Perform according to the provisions of Chapter 5 of GB/T10530
7 Steps
7.1 Sample preparation
Weigh about 2 g of sample (accurate to 1 mg) and put it into a platinum crucible (5.1). 7.2 Preparation of test solution
7.2.1 In the platinum crucible (5.1), disperse the sample with 2 cm2 of water, then add about 5 cm2 of perchloric acid (4.1) and 10 cm2 of hydrofluoric acid (4.3), and then place the platinum crucible on a hot sand bath to evaporate until the high amino acid fume is formed. Remove the platinum crucible from the sand bath and cool it. Add 10 cm hydrofluoric acid and evaporate the sample in the platinum crucible on a sand bath until dry. 7.2.2 Treat the residue with 5 cm pernitrogen acid (4.1), rinse the inner wall of the platinum crucible with 2 cm2 water, and then evaporate it on a sand bath until dry.
7.2.3 Add 5 cm hydrochloric acid (4.4) and 20 cm water to the inner wall, treat the residue, and then dissolve the garnet on the heated sand until all salts are dissolved. 7.2.4 Filter with medium-speed ash-free filter paper for 12 seconds, collect the filtrate in a 100 cm volumetric flask, wash the garnet and filter paper with hot water, and collect the washing liquid (F3) in the volumetric flask for later use. Place the filter paper in a platinum crucible (5.5) and dry it in a drying oven (5.6) for 1 h. Heat it and burn it on a blowtorch (5.4). Melt the residue with 0.5 g of sodium carbonate (4.5), cool it and treat it with hot water. Add hydrochloric acid (4.4) drop by drop for acidification. Mix this solution with the stored filtrate (F3) and dilute to 100 cm3, shake well, transfer this test solution to the polyene bottle (5.3) and store well. This solution is the test solution for copper and manganese content. 7.3 Drawing of standard curve
7.3.1 Use a pipette to take 0.5 cm3, 2.5 cm3, 5.0 cm3, 10.0 cm3, 15.0 cm3 of copper standard solution (4.8), respectively. Instructions:
) Appendix D of ISO 5795--1 stipulates that Whatman NO. 40 medium-speed ashless filter paper, HG/T 2879. 1 — 1997
25.0 cm3, dilute to the scale with water in six 50 cm3 volumetric bottles and shake well. The copper concentration in each bottle is 0.1 μg/cm3, 0.5 μg/cm3, 1.0 μg/cm3, 2.0 μg/cm2, 3.0 μg/cm2 and 5.0 μg/cm2, 7.3.2. According to the instrument manufacturer's instructions, test the atomic absorption spectrometer (5.2) and use air/acetylene flame to measure the absorbance of each standard solution at a wavelength of 324.5nm. 7.3.3 Inhale the above series of standard solutions into the atomic absorption spectrometer, measure their absorbances respectively and record them. After measuring each standard solution, add water to the flame to clean the system. 7.3.4 Draw a standard curve with the concentration of copper standard solution (ug/cm2) as the horizontal axis and its corresponding absorbance as the vertical axis. 7.4 Measurement
7.4.1 Cross-absorb the test solution and water, as in 7.3.3, test twice, and record the average absorbance value. 7.4.2 Find the copper concentration of the test solution corresponding to the average absorbance value from the standard curve (7.3.4) and express it in m/cm2. 7.5 Blank test
The blank test is carried out according to the above step (7) without adding sample. 8 Expression of results
The total copper content of the sample is calculated as follows: mg/kge(cn)-e(Ca)z
Wherein: e(Ca) is the copper content of the sample, μg/cm2 - the cadmium content in the blank test, 4g/cm2; e(Ca12) is the mass of the sample (7.1), g.
9 Test report
The test report should include the following items:
The standard number on which the test is based;
The complete number and origin of the sample;
Test results;
Record any abnormal phenomena that occur during the test;
Test date.
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