This standard specifies the method for determining the iron content of nickel-chromium alloys by sulfosalicylic acid photometry. This standard is applicable to the determination of iron content in nickel-chromium alloys. Determination range: 0.10% to 1.00%. JB/T 6326.5-1992 Chemical analysis method for nickel-chromium and nickel-chromium-iron alloys Determination of iron content by sulfosalicylic acid photometry JB/T6326.5-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Chemical Analysis Method of Nickel-Chromium AlloywwW.bzxz.Net
Determination of Iron Content by Sulfosalicylic Acid Photometric Method
1 Subject Content and Scope of Application
This standard specifies the method for determining the iron content of nickel-chromium alloy by sulfosalicylic acid photometric method. This standard is applicable to the determination of iron content in nickel-chromium alloy. The determination range is 0.10%~1.00%. 2 Reference Standards
GB1467 General Principles and General Provisions for Chemical Analysis Methods of Metallurgical Products. 3 Method Summary
JB/T6326.5-92
After the sample is dissolved with mixed acid, the acidity is adjusted with ammonium hydroxide and sulfuric acid, sulfosalicylic acid is added to make the iron color, and its absorbance is measured. 4 Reagents and Instruments
Hydrochloric acid (density p1.19g/ml).
4.2 Nitric Acid (density pl.42g/ml).
4.3 Sulfuric acid (density p1.84g/ml).
4.4 Ammonium hydroxide (density po.90g/ml). 4.5 Nitric acid (1+1).
Hydrochloric acid-nitric acid mixed acid: hydrochloric acid (4.1) + nitric acid (4.2) (1+1)4.7
Sulfuric acid (1+10).
Sulfuric acid (1+20).
Ammonium hydroxide (1+1).
Ammonium hydroxide (1+10).
Sulfosalicylic acid solution (100g/L): Dissolve 10g sulfosalicylic acid in 100ml water and adjust to pH 2.2 on an acidometer with ammonium hydroxide (4.9) and (4.10).
4.12 Iron standard solution.
4.12.1 Weigh 1.000g of pure iron (99.9% or more) into a 250ml beaker, add 20ml nitric acid (4.5) to dissolve, remove nitrogen oxides, and transfer to a 1000ml volumetric flask. Dilute to scale with water and mix. This solution contains 1.00mg iron per ml. 4.12.2 Transfer 10.00ml of the standard iron solution (4.12.1) into a 100ml volumetric flask, dilute to scale with water and mix. This solution contains 100μg iron per ml.
4.12.3 Transfer 20.00ml of the standard iron solution (4.12.1) into a 100ml volumetric flask, dilute to scale with water and mix. This solution contains 200μg iron per ml.
4.13 Acidity meter
5 Analysis steps
Approved by the Ministry of Machinery and Electronics Industry on June 26, 1992, and implemented on January 1, 1993
5.1 Sample quantity
Weigh two portions of 0.1000g of the sample.
5.2 Blank test
Carry out a blank test with the sample
JB/T6326.5--92
5.3 Determination
5.3.1.Put the samples in a 100ml beaker, add 5-10ml of hydrochloric acid-nitric acid mixture (4.6), heat the entire surface of the blood at low temperature to dissolve, remove it, add 30ml of water, and adjust the pH to 2.2 on the acidity meter with ammonium hydroxide (4.9, 4.10) and sulfuric acid (4.7, 4.8). 5.3.2 Color development solution: add 5 ml of sulfosalicylic acid (4.11), transfer to a 100 ml volumetric flask, dilute to the mark with water, and mix well. 5.3.3 Reference solution: transfer another portion (5.3.1) solution to a 100 ml volumetric flask, dilute to the mark with water, and mix well: 5.3.4 Transfer the above solution to a 2 cm or 3 cm cuvette, measure its absorbance at a wavelength of 520 nm using the reference solution as a reference, subtract the absorbance of the reagent blank, and find the corresponding iron solution from the working curve. 5.4 Drawing of working curve
Pipette 0.00, 1.00, 2.00, 3.00, 4.00, 5.00 ml of iron standard solution (4.12.2 or 4.12.3) and place them in 6 100 ml beakers respectively. The following is carried out according to 5.3.1 to 5.3.4. The color developing solution without iron standard solution is used as the reference solution to measure its absorbance. Draw the working curve.
6 Calculation of analysis results
Calculate the percentage of iron according to the following formula:
Fe%=mL×100
Where: m——the amount of iron found from the working curve, g: one sample amount, g.
7 Allowable difference
The difference in analysis results between laboratories should not be greater than the allowable difference listed in the following table. Qiu
Iron content
0.10~0.50
>0.50~1.00
Additional remarks:
This standard is proposed and managed by Shanghai Electric Science Research Institute of the Ministry of Machinery and Electronics Industry. This standard is drafted by Dalian Steel Precision Alloy Research Institute of the Ministry of Metallurgical Industry. The main drafter of this standard is Wang Lianzhi.
Allowance
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