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GB/T 11064.8-2013 English PDF (GBT11064.8-2013)

GB/T 11064.8-2013 English PDF (GBT11064.8-2013)

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GB/T 11064.8-2013: Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride -- Part 8: Determination of silicon content -- Molybdenum blue spectrophotometric method

This part of GB/T 11064 specifies the determination method of silicon content in lithium carbonate, in lithium hydroxide monohydrate, and in lithium chloride. This Part applies to the determination of silicon content in lithium carbonate, in lithium hydroxide monohydrate, and in lithium chloride. The determination range: 0.0005%~0.050%.
GB/T 11064.8-2013
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.120.99
H 64
Replacing GB/T 11064.8-1989
Methods for chemical analysis of lithium carbonate,
lithium hydroxide monohydrate and lithium chloride -
Part 8. Determination of silicon content-
Molybdenum blue spectrophotometric method
ISSUED ON. NOVEMBER 27, 2013
IMPLEMENTED ON. AUGUST 01, 2014
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
1 Scope ... 5
2 Method Summary... 5
3 Reagents ... 5
4 Instrumentation ... 6
5 Samples ... 6
6 Analysis Steps ... 6
7 Calculation of Analysis Results ... 8
8 Precision ... 8
9 Test report ... 9
Foreword
GB/T 11064 ?€?Methods for chemical analysis of lithium carbonate, lithium hydroxide monohydrate and lithium chloride?€? is divided into 16 parts.
- Part 1. Determination of lithium carbonate content - Acid-alkali titrimetric method; - Part 2. Determination of lithium hydroxide content - Acid-alkali titrimetric method; - Part 3. Determination of lithium chloride content - Potentiometric method; - Part 4. Determination of potassium and sodium content - Flame atomic
absorption spectrometric method;
- Part 5. Determination of calcium content - Flame atomic absorption spectrometric method;
- Part 6. Determination of magnesium content - Flame atomic absorption
spectrometric method;
- Part 7. Determination of iron content - 1,10-phenanthroline spectrophotometric method;
- Part 8. Determination of silicon content - Molybdenum blue spectrophotometric method;
- Part 9. Determination of sulfate content - Barium sulfate nephelometry method; - Part 10. Determination of chloride content - Silver chloride nephelometry method; - Part 11. Determination of Acid-insolubles Content - Gravimetric method; - Part 12. Determination of carbonate content - Determination of lithium chloride content - Potentiometric method;
- Part 13. Determination of aluminum content - Chromazurol S-cetylpyridine bromide spectrophotometric method;
- Part 14. Determination of arsenic content - Molybdenum blue spectrophotometric method;
- Part 15. Determination of fluoride content - Ion selective method;
- Part 16. Determination of calcium, magnesium, copper, lead, zinc, nickel, manganese, cadmium and aluminum content - Inductively coupled plasma
atomic emission spectrometry.
This Part is part 8 of GB/T 11064.
This Part is drafted in accordance with rules given in GB/T 1.1-2009.
This Part replaces GB/T 11064.8-1989 "Lithium carbonate, lithium hydroxide monohydrate and lithium chloride - Determination of silicon content - Molybdenum blue spectrophotometric method".
Compared with GB/T 11064.8-1989, the main changes of this Part are as follows. - ADD the repeatability terms;
- RE-EDIT the text format; ADD the test report.
This Part shall be under the jurisdiction of National Standardization Technical Committee of Nonferrous Metals (SAC/TC 243).
Drafting organizations of this Part. Sichuan Tianqi Lithium Industries Inc., Xinjiang Research Institute of Non ferrous Metals, and Xinjiang Wuxin Lithium Salt Development Co., Ltd.
The main drafters of this Part. Gou Haixia, Luo Yuping, Zhu Xiangyu, Guan Yuzhen, Mi Yongqiang, Zhang Xiuli, and Sun Tao.
The historical version replaced by this Part is as follows.
- GB/T 11064.8-1989.
GB/T 11064.8-2013
Methods for chemical analysis of lithium carbonate,
lithium hydroxide monohydrate and lithium chloride -
Part 8. Determination of silicon content -
Molybdenum blue spectrophotometric method
1 Scope
This part of GB/T 11064 specifies the determination method of silicon content in lithium carbonate, in lithium hydroxide monohydrate, and in lithium chloride.
This Part applies to the determination of silicon content in lithium carbonate, in lithium hydroxide monohydrate, and in lithium chloride. The determination range. 0.000 5%~0.050%.
2 Method Summary
The sample is dissolved with hydrochloric acid. In weak acid medium, the silicon and ammonium molybdate react to produce molybdosilicate yellow heteropolyacid. The interference of phosphor and arsenic can be eliminated by sulfuric acid and oxalic acid. The molybdosilicate yellow can be reduced to molybdosilicate blue with ascorbic acid, so that the absorbance can be determined at the 800nm wavelength of a spectrophotometer. 3 Reagents
Unless otherwise specified, the reagent used in this Part is an analytical pure reagent, and the water used is the secondary deionized water.
3.1 Hydrochloric acid (1+1), GR
3.2 Sulfuric acid (3+97), GR
3.3 Sulfuric acid (33+67), GR
3.4 Ammonia (1+5), GR, stored in plastic bottles.
3.5 Ammonium molybdate solution (50g/L). filtered if necessary, stored in plastic bottles. 3.6 Oxalic acid solution (50g/L). stored in plastic bottles.
3.7 Ascorbic acid solution (20g/L). prepared when it is used.
3.8 P-Nitrophenol indicator (1g/L).
GB/T 11064.8-2013
The difference of analysis results among laboratories shall not be more than the allowable difference in Table 4.
Table 4
Mass fraction of silicon / % Allowable difference / %
0.000 5~0.001 0 0.000 3
>0.001 0 ~0.002 5 0.000 4
>0.002 5~0.005 0 0.000 7
>0.005 0~0.007 5 0.001 1
>0.007 5~0.010 0.002 0
>0.010 ~0.025 0.003
>0.025 ~0.050 0.005
9 Test report
The test report shall contain the following content.
- Sample;
- The number of this Part national standard;
- Analysis result and its expression;
- Difference with the basic analysis step;
- Anomalies observed in the determination;
- Determination date.

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