YS/T 252.2-2007 English PDF
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YS/T 252.2-2007: Methods for chemical analysis of nickel matte. Determination of iron content. Sulfosalicylic acid phototmetric method
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YS NONFERROUS INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.120.40 H 13 Replacing YS/T 252.2-1994 Methods for chemical analysis of nickel matte - Determination of iron content - Sulfosalicylic acid photometric method ISSUED ON: APRIL 13, 2007 IMPLEMENTED ON: OCTOBER 01, 2007 Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 1 Scope ... 5 2 Method summary ... 5 3 Reagents ... 5 4 Instruments ... 6 5 Analytical procedures ... 6 6 Calculation and expression of analysis results ... 7 7 Precision ... 7 8 Quality assurance and control ... 8Foreword
YS/T 252 "Methods for chemical analysis of nickel matte" is divided into five parts: YS/T 252.1 Methods for chemical analysis of nickel matte - Determination of nickel content - Dimethylglyoxime gravimetric method YS/T 252.2 Methods for chemical analysis of nickel matte - Determination of iron content - Sulfosalicylic acid photometric method YS/T 252.3 Methods for chemical analysis of nickel matte - Determination of cobalt content - Flame atomic absorption spectrometric method YS/T 252.4 Methods for chemical analysis of nickel matte - Determination of cobalt content - Sodium thiosulphate titrimetric method YS/T 252.5 Methods for chemical analysis of nickel matte - Determination of sulfur content - Combustion-neutralization titrimetric method This Part is Part 2. This Part replaces YS/T 252.2-1994 "Determination of iron content by sulfosalicylic acid photometric method". Compared with YS/T 252.2-1994, this Part mainly has the following changes: - ADJUST the sample amount from 0.200 g or 0.500 g to 0.400 g according to the iron content; - MODIFY the dispensing volume of the test solution from 2.00 mL to 10.00 mL; - ADJUST the cuvette 3 cm to 1 cm; - ADJUST the working curve range from (0 ~ 0.5) mg/100 mL to (0 ~ 1.5) mg/100 mL; - ADD the repeatability limits, supplementing quality assurance and control terms. This Part was proposed by AND shall be under the jurisdiction of the National Technical Committee for Standardization of Nonferrous Metals. Responsible drafting organization of this Part: Jinchuan Group Co., Ltd. Participated drafting organization of this Part: Guangzhou Nonferrous Metals Research Institute, Beijing General Research Institute of Mining and Metallurgy. The main drafters of this Part: Liu Haidong, Yu Shengjie, Lin Xiuying, Zhao Junfeng, Zhu Yuqiang. Methods for chemical analysis of nickel matte - Determination of iron content - Sulfosalicylic acid photometric method1 Scope
This Part specifies the method for determination of iron content in high nickel matte. This Part is applicable to the determination of iron content in high nickel matte. Measuring range: 0.5% ~ 7%.2 Method summary
The sample is decomposed with hydrochloric acid, nitric acid-potassium chlorate saturated solution. In the hydrochloric acid medium of pH1.5 ~ pH3.0, iron (III) and sulfosalicylic acid form a reddish-brown complex, whose absorbance is measured at the wavelength of 545 nm with a spectrophotometer. Calculate the iron content according to the standard curve method.3 Reagents
3.1 Hydrochloric acid (ρ1.19 g/mL). 3.2 Hydrochloric acid (1 + 3). 3.3 Nitric acid (ρ1.42 g/mL). 3.4 Ammonia (1 + 3). 3.5 Nitric acid-potassium chlorate saturated solution: Dissolve potassium chlorate in nitric acid (3.3) until saturated. 3.6 Sulfosalicylic acid solution (100 g/L): Weigh 10 g of sulfosalicylic acid. Dissolve it in water and dilute it to 100 mL. Adjust it to about pH2 with ammonia water (3.4). 3.7 Iron standard solution: Weigh 0.1500 g of metallic iron (mass fraction of iron ≥ 99.9%). Place it in a 250 mL beaker. Add 20 mL of nitric acid (1 + 1). Heat to completely dissolve. Boil to drive out nitrogen oxides. Remove it. Cool to room temperature. Transfer to a 1000 mL volumetric flask. Use water to make the volume reach to the mark. 1 mL of this solution contains 0.15 mg of iron. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
