YS/T 820.1-2012Methods for chemical analysis of laterite nickel ores - Part 1: Determination of nickel content - Flame atomic absorption spectrometry (English PDF)

Foreword

This part was drafted in accordance with the rules given in GB/T 1.1-2009.

YS/T 820-2012 Methods for chemical analysis of laterite nickel ores is divided into 26

parts:

-- Part 1: Determination of nickel content - Flame atomic absorption spectrometry;

-- Part 2: Determination of nickel content - Dimethylglyoxime 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 spectrometry;

Methods for chemical analysis of laterite nickel ores - Part 1:

Determination of nickel content - Flame atomic absorption

spectrometry

1 Scope

This part of YS/T 820 specifies the determination method of nickel content in laterite

nickel ores.

This part applies to the determination of the nickel content in laterite nickel ores. The

measuring range is 0.100%~3.00%.

2 Normative references

The following documents are essential for the application of this document. For the

dated referenced documents, only the versions with the indicated dates are applicable

to this document; for the undated referenced documents, only the latest version

(including all the amendments) 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 sample is decomposed with hydrochloric acid, nitric acid, hydrofluoric acid, and

perchloric acid. Salts are dissolved with hydrochloric acid; in a dilute hydrochloric acid

medium, at the wavelength of 232.0 nm of an atomic absorption spectrometer, with the

use of an air-acetylene flame, the absorbance of nickel is measured, and then the nickel

content is calculated.

4 Reagents

Unless otherwise stated, only reagents confirmed to be analytical grade and distilled or

deionized water or water of equivalent purity are used in the analysis.

5 Instruments

The atomic absorption spectrometer shall be equipped with a nickel hollow cathode

lamp.

Under the working conditions of the instrument, any atomic absorption spectrometer

that can achieve the following indicators can be used:

-- Characteristic concentration: In the solution that is basically consistent with the

measuring test solution, the characteristic concentration of nickel shall not be

greater than 0.08 µg/mL;

-- Precision: The absorbance is measured 10 times with the standard solution of the

maximum concentration, and the standard deviation shall not exceed 1% of the

average absorbance; the absorbance is measured 10 times with the standard

solution of the minimum concentration (not "zero" standard solution), and the

standard deviation shall not exceed 0.5% of the average absorbance of the

standard solution with the maximum concentration;

-- Working curve linearity: The working curve is divided into five equal parts

according to the concentration, and the ratio of the absorbance difference of the

highest section to the absorbance difference of the lowest section shall not be

less than 0.70.

6 Samples

8 Calculation of analysis results

The nickel content is expressed as the mass fraction wNi of nickel, and the value is

expressed in %, calculated according to formula (1):

where:

rho1 -- the concentration of nickel in the measuring solution obtained from the

working curve, in micrograms per milliliter (µg/mL);

rho2 -- the concentration of nickel in the blank solution obtained from the working

curve, in micrograms per milliliter (µg/mL);

V0 -- the total volume of the test solution, in milliliters (mL);

V1 -- the volume of the test solution taken, in milliliters (mL);

V2 -- the volume of the measuring solution, in milliliters (mL);

m -- the mass of the sample, in grams (g);

K -- conversion factor, calculated according to formula (2);

A -- the mass fraction of the hygroscopic moisture content measured according to

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