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Chemical analysis methods of aluminum hardeners. Part 4: Determination of chromium content. The ammonium persulfate oxidation-ammonium ferrous sulfate titrimetric method
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YS/T 807.4-2012
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Basic data | Standard ID | YS/T 807.4-2012 (YS/T807.4-2012) | | Description (Translated English) | Chemical analysis methods of aluminum hardeners. Part 4: Determination of chromium content. The ammonium persulfate oxidation-ammonium ferrous sulfate titrimetric method | | Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) | | Classification of Chinese Standard | H12 | | Classification of International Standard | 77.120.10 | | Word Count Estimation | 6,628 | | Regulation (derived from) | Ministry of Industry and Information Technology Bulletin No. 55 of 2012; industry standard filing Notice 2013 No. 1 (Total No. 157); | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Summary | This standard specifies the aluminum alloy with chromium determination. This standard applies to aluminum alloy chromium content. Measuring range: 1. 0% ~ 8. 0%. | YS/T 807.4-2012: Chemical analysis methods of aluminum hardeners. Part 4: Determination of chromium content. The ammonium persulfate oxidation-ammonium ferrous sulfate titrimetric method
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Chemical analysis methods of aluminum hardeners.Part 4. Determination of chromium content.The ammonium persulfate oxidation-ammonium ferrous sulfate titrimetric method
ICS 77.120.10
H12
People's Republic of China Nonferrous Metals Industry Standard
Intermediate aluminum alloys -
Part 4. Determination of chromium content
Ammonium persulfate oxidation - ammonium ferrous sulfate titration
Part 4. Determinationofchromiumcontent-
Issued on. 2012-11-07
2013-03-01 implementation
Ministry of Industry and Information Technology of the People's Republic of China released
Foreword
YS/T 807-2012 "aluminum master alloy chemical analysis method" is divided into 14 parts.
--- Part 1. Determination of iron content dichromate method;
--- Part 2. Determination of manganese content Potassium periodate spectrophotometric method;
--- Part 3. Determination of nickel by titration with EDTA;
--- Part 4. Determination of chromium content ammonium persulfate oxidation - ammonium ferrous sulfate titration;
--- Part 5. Determination of zirconium content EDTA titration;
--- Part 6. Determination of boron ion selective electrode method;
--- Part 7. Determination of beryllium content Eriochrome cyanide blue R spectrophotometry;
--- Part 8. Determination of antimony content Potassium iodide spectrophotometry;
--- Part 9. Determination of bismuth content of potassium iodide spectrophotometry;
--- Part 10. Determination of potassium content by flame atomic absorption spectrometry;
--- Part 11. Determination of sodium content by flame atomic absorption spectrometry;
--- Part 12. Determination of copper content of sodium thiosulfate titration;
--- Part 13. Determination of vanadium content ammonium ferrous sulfate titration;
--- Part 14. Determination of strontium EDTA titration.
This section YS/T Section 4807 of.
This section drafted in accordance with GB/T 1.1-2009 given rules.
The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.
This section is responsible for drafting units. Aluminum Corporation of China Zhengzhou Research Institute, China Nonferrous Metals Industry Quality Standards and Metrology Institute
The study.
Participated in the drafting of this section. Guangzhou Nonferrous Metal Research Institute, Northeast Light Alloy Co., Ltd., Zhengzhou City Aluminum Co., Ltd. Mastery.
The main drafters of this section. Zhang Jie, Liyue Ping, Kuang Yuyun, Zhang Jin, Zhou Bing, Dai Fengying, Zhang Hongxia, high Zhiyong.
Intermediate aluminum alloys -
Part 4. Determination of chromium content
Ammonium persulfate oxidation - ammonium ferrous sulfate titration
Warning --- personnel should use this standard regular laboratory work experience. This standard does not point out all possible security asked
question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
1 Scope
This section YS/T 807 specifies the method for determination of aluminum alloy with chromium.
This section applies to the determination of aluminum alloy with chromium. Measuring range. 1.0% to 8.0%.
2 Method summary
Sample was dissolved with sodium hydroxide and hydrogen peroxide, acidified with nitric acid. In sulfuric acid - phosphoric acid, silver nitrate as a catalyst, used sulfuric acid
Ammonium chromium (Ⅲ) oxidized to Cr (Ⅵ), hydrochloric acid while reducing the oxidized manganese (Ⅶ), to phthalic acid as indicator, with ferrous sulfate
Ammonium standard solution titration.
3 Reagents
Unless otherwise indicated in the analysis using only the gifted class pure reagents and sub-boiling distilled water or potassium.
3.1 Hydrogen peroxide (ρ = 1.10g/mL).
3.2 nitric acid (11).
3.3 Sodium hydroxide solution (200g/L), stored in a polyethylene bottle.
3.4 sulfuric acid - phosphoric acid mixed. in 300mL water under constant stirring slowly added 100mL phosphate (ρ = 1.69g/mL) and 200mL
Sulfuric acid (ρ = 1.84g/mL), and mix.
3.5 silver nitrate solution (10g/L), stored in brown bottles.
3.6 manganese sulfate solution (10g/L).
3.7 solution of ammonium persulfate (200g/L), using now.
3.8 hydrochloride (13).
3.9 o-aminobenzoic acid solution (2g/L). Weigh 0.2g o-aminobenzoic acid (N- substituting phenyl anthranilic acid, phenyl anthranilic
Formic acid) in 300mL beaker, add 0.2g of anhydrous sodium carbonate was added 20mL of water, heat gently to dissolve, cooled, diluted with water to 100mL,
Mix; stored in a dropper bottle.
3.10 standard potassium dichromate solution [c (16K2Cr2O7
) = 0.0500mol/L]. weigh 2.4515g baseline potassium dichromate (previously at 150 ℃
Drying 2h and cooled to room temperature in a desiccator), placed in 300mL beaker, dissolved in water and transferred to 1000mL volumetric flask, dilute with water
Diluted to volume, and mix.
3.11 ferrous ammonium sulfate standard solution (0.05mol/L).
3.11.1 preparation. Weigh 19.6g of ferrous ammonium sulfate [(NH4) 2Fe (SO4) 2 · 6H2O] in 500mL beaker, 200mL
Of water was added slowly with stirring 50mL sulfuric acid (ρ = 1.84g/mL), is completely dissolved, cooled to room temperature, transferred to 1000mL volumetric flask
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