YS/T 820.2-2012 PDF English
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Methods for chemical analysis of laterite nickel ores. Part 2: Determination of nickel content. Dimethylglyoxime spectrophotometry
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YS/T 820.2-2012: Methods for chemical analysis of laterite nickel ores. Part 2: Determination of nickel content. Dimethylglyoxime spectrophotometry
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NONFERROUS METAL INDUSTRY STANDARD
ICS 73.060
D 04
Methods for Chemical Analysis of Laterite Nickel Ores -
Part 2.Determination of Nickel Content - Dimetylglyoxime
Issued on. NOVEMBER 7, 2012
Implemented on. MARCH 1, 2013
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Method Summary... 5
4 Reagents... 5
5 Instrument... 6
6 Specimen... 6
7 Analytical Procedures... 6
8 Calculation of Analysis Result... 8
9 Precision... 8
10 Test Report... 9
Foreword
This Part was drafted in accordance with the rules provided in GB/T 1.1-2009.
YS/T 820-2012 Methods for Chemical Analysis of Laterite Nickel Ores is divided into 26 parts
in total.
---Part 1.Determination of Nickel Content - Flame Atomic Absorption Spectrometry;
---Part 2.Determination of Nickel Content - Dimetylglyoxime Spectrophotometry;
---Part 3.Determination of Total Iron Content - Potassium Dichromate Titration;
---Part 4.Determination of Phosphorus Content - Phosphorus Molybdenum Blue
Spectrophotometry;
---Part 5.Determination of Cobalt Content - Flame Atomic Absorption Spectrometry;
---Part 6.Determination of Copper Content – Flame Atomic Absorption Spectrometry;
---Part 7.Determination of Calcium and Magnesium Content - Flame Atomic Absorption
Spectrometry;
---Part 8.Determination of Silica Content - Potassium Silicafluoride Titrimetric Method;
---Part 9.Determination of Scandium and Cadmium Contents - Inductively Coupled
Plasma Mass Spectrometry;
---Part 10.Determination of Calcium, Cobalt, Copper, Magnesium, Manganese, Nickel,
Phosphate and Zinc Content - Inductively Coupled Plasma Atomic Emission
Spectrometry;
---Part 11.Determination of Fluorine and Chlorine Contents - Ion Chromatography;
---Part 12.Determination of Manganese Content - Flame Atomic Absorption Spectrometry;
---Part 13.Determination of Lead Content - Flame Atomic Absorption Spectrometry;
---Part 14.Determination of Zinc Content - Flame Atomic Absorption Spectrometry;
---Part 15.Determination of Cadmium Content - Flame Atomic Absorption Spectrometry;
---Part 16.Determination of Carbon and Sulfur Content - High Frequency Combustion
with Infrared Absorption;
---Part 17.Determination of Arsenic, Antimony and Bismuth Contents - Hydride
Generation-atomic Fluorescence Spectrometry;
---Part 18.Determination of Mercury Content - Cold Atomic Absorption Spectrometry;
---Part 19.Determination of Aluminum, Chromium, Iron, Magnesium, Manganese, Nickel
and Silicon Contents - Energy-dispersive X-ray Fluorescence Spectrometry;
---Part 20.Determination of Aluminum Content- EDTA Titration;
---Part 21.Determination of Chromium Content - The Ammonium-ferrous Sulfate
Titration Method;
---Part 22.Determination of Magnesium Content - EDTA Titration;
---Part 23.Determination of Cobalt, Iron, Nickel, Phosphorus, Aluminum Oxide, Calcium
Oxide, Chromium Oxide, Magnesium Oxide, Manganese Oxide, Silicon Dioxide and
Titanium Dioxide Content - Wavelength Dispersive X-ray Fluorescence Spectrometry;
---Part 24.Determination Hygroscopic Moisture Content - Gravimetric Method;
---Part 25.Determination of Combined Water Content - Gravimetric Method;
---Part 26.Determination of Loss on Ignition - Gravimetric Method.
This Part is Part 2 of YS/T 820-2012.
This Standard shall be under the jurisdiction of National Technical Committee 243 on
Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The responsible drafting organizations of this Standard. Beijing General Research Institute of
Mining & Metallurgy; Bayuquan Entry-Exit Inspection and Quarantine Bureau of the People’s
Republic of China; Jinchuan Group Co., Ltd.
The drafting organizations of this Part. Bayuquan Entry-Exit Inspection and Quarantine Bureau
of the People’s Republic of China; Northwest Institute for Non-ferrous Metal Research; Beijing
General Research Institute of Mining & Metallurgy.
The participating drafting organizations of this Part. Guangzhou Nonferrous Metals Research
Institute; Nantong Entry-Exit Inspection and Quarantine Bureau of the People’s Republic of
China; MCC Huludao Nonferrous Metals Group Co., Ltd.; Jinchuan Group Co., Ltd.; Zhongbao
Binhai Nickel Industry Co., Ltd.; Guangxi Yinyi Mining and Metallurgy Technology Co., Ltd.;
Shandong Xin Hai Technology Co., Ltd.
The main drafters of this Part. Jiang Xiaoguang, Sun Baolian, Chu Ning, Liu Chunfeng, Zhou
Kai, Tang Shufang, Li Changli, Li Bo, Dai Fengying, Ding Juxiang, Zhou Jiannan, Liu Xianbin,
Wang Na, Zhang Yongjin, Zhou Xiaolu, Zhang Xuping, Zhao Dan, Li Weigang, Wang Yaqin,
Li Fenglong.
Methods for Chemical Analysis of Laterite Nickel Ores -
Part 2.Determination of Nickel Content - Dimetylglyoxime
Spectrophotometry
1 Scope
This Part of YS/T 820 specifies the method for the determination of nickel content in laterite
nickel ores.
This Part is applicable to the determination of nickel content in laterite nickel ores. The
determination range is. 0.10% ~ 3.00%.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
YS/T 820.24-2012 Methods for Chemical Analysis of Laterite Nickel Ores - Part 24.
Determination Hygroscopic Moisture Content - Gravimetric Method
3 Method Summary
The test portion is digested with hydrochloric acid, nitric acid, hydrofluoric acid and perchloric
acid, then, heated and evaporated to near dryness. Use dilute nitric acid to dissolve the salts.
Use potassium sodium tartrate as a masking agent;
4 Reagents
Unless it is otherwise specified, only reagents that are confirmed to be analytically pure, and
distilled water or deionized water or water of equivalent purity shall be used in the analysis.
4.1 Hydrochloric acid (1.19 g/mL).
4.2 Nitric acid (1.42 g/mL).
4.3 Hydrofluoric acid (1.15 g/mL).
4.9 Dimetylglyoxime solution (10 g/L). weigh and take 1.0 g of dimetylglyoxime and dissolve
it in 100 mL of sodium hydroxide solution (4.7).
4.10 Nickel standard stock solution. weigh and take 0.5000 g of metallic nickel (wNi 99.95%);
place it in a 250 mL beaker; along the wall of the beaker, add 20 mL of nitric acid (4.5); cover
with a watch glass; heat and dissolve it, then, cool to room temperature.
4.11 Nickel standard solution. transfer and take 10.00 mL of nickel standard stock solution
(4.10); place it in a 500 mL volumetric flask. Add 10 mL of nitric acid (4.5); use water to dilute
to the scale, then, mix it up. 1 mL of this solution contains 20 g of nickel.
5 Instrument
Spectrophotometer.
6 Specimen
6.1 Specimen
The particle size of the specimen shall be less than 160 m.
7 Analytical Procedures
7.1 Test Portion
Weigh and take 0.10 g of specimen, accurate to 0.0001 g.
7.2 Number of Determinations
Independently carry out two determinations and take the average value.
7.3 Blank Test
Carry out a blank test along with the test portion.
7.4 Determination
7.4.1 Place the test portion (7.1) in a 200 mL polytetrafluoroethylene beaker; use a small amount
of water to wet it; add 15 mL of hydrochloric acid (4.1), 5 mL of nitric acid (4.2), 2 mL of
hydrofluoric acid (4.3) and 2 mL of perchloric acid (4.4).
7.4.2 In accordance with Table 1, divide the test solution into a 100 mL volumetric flask. Add
20 mL of potassium sodium tartrate solution (4.6) and mix it up. Then, add 20 mL of sodium
hydroxide solution (4.7) and mix it up.
7.4.3 Transfer and take part of the solution (7.4.2) into a suitable cuvette (1 cm or 2 cm). Take
the reagent blank solution prepared with the test portion as a reference; at a wavelength of 460
nm of a spectrophotometer, measure the absorbance of nickel; find out the corresponding nickel
content from the working curve.
7.5 Drawing of Working Curve
Transfer and take 0 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, 6.00 mL and 8.00 mL of the
nickel standard solution (4.11) in a group of 100 mL volumetric flasks; proceed in accordance
with 7.4.2.
8 Calculation of Analysis Result
The nickel content, counted as mass fraction wNi, expressed in (%), shall be calculated in
accordance with Formula (1).
9 Precision
9.1 Repeatability
As for the determined value of two independent test results obtained under repeatability
conditions, within the range of average value provided below, the absolute difference of the two
test results does not exceed the repeatability limit (r); the circumstance of exceeding the
repeatability limit (r) does not exceed 5%. The repeatability limit (r) is obtained through linear
interpolation method in accordance with the data in Table 2.
9.2 Reproducibility
10 Test Report
This Chapter specifies the content included in the test report. Content of at least the following
aspects shall be provided.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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