YS/T 820.2-2012 English PDF (YST820.2-2012)

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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
YS/T 820.2-2012
NONFERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 73.060
D 04
Methods for Chemical Analysis of Laterite Nickel Ores -
Part 2: Determination of Nickel Content - Dimetylglyoxime
Spectrophotometry
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;
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; in an alkaline medium of sodium hydroxide,
use ammonium persulfate as an oxidant; nickel and dimethylglyoxime generate a soluble wine-
red complex. At a wavelength of 460 nm of a spectrophotometer, measure the absorbance of
nickel and calculate the nickel content.
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).
4.4 Perchloric acid (1.67 g/mL).
4.5 Nitric acid (1 + 3).
4.6 Potassium sodium tartrate solution (200 g/L).
4.7 Sodium hydroxide solution (50 g/L).
4.8 Ammonium persulfate solution (30 g/L).
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. Transfer it to a 500 mL
volumetric flask; use water to dilute to the scale, then, mix it up. 1 mL of this solution contains
1 mg of nickel.
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.
6.2 Determination of Hygroscopic Moisture Content
While analyzing the specimen, in accordance with the stipulations of YS/T 820.24-2012,
determine the hygroscopic moisture content.
7 Analytical Procedures
7.1 Test Portion
Weigh and take 0.10 g of specimen, accurate to 0.0001 g.