GB/T 22660.7-2008Chemical analysis methods of lithium fluoride - Part 7: Determination of iron content - Orthophenantholine photometric method (English PDF)
氟化锂化学分析方法 第7部分：三氧化二铁含量的测定 邻二氮杂菲分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 29, 2008
Implementation date
November 1, 2009
Scope
GB/T 22660.7-2008 is the English-translated version of 氟化锂化学分析方法 第7部分：三氧化二铁含量的测定 邻二氮杂菲分光光度法.
GB/T 22660.7-2008 is the Chinese standard "Chemical analysis methods of lithium fluoride - Part 7: Determination of iron content - Orthophenantholine photometric method".
Its scope clause reads: This section GB/T 22660 specifies the method for determination of lithium fluoride iron oxide content. This section applies to the determination of lithium fluoride, iron oxide content. Measuring range. <=0.20%. Its clauses include method summary; reagents.
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Document preview — GB/T 22660.7-2008
National Standard of the People's Republic of China
- ICS
- 77.120
- Classification
- H 60
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Method summary
- 4 Reagents
1 Scope
This section GB/T 22660 specifies the method for determination of lithium fluoride iron oxide content.
This section applies to the determination of lithium fluoride, iron oxide content. Measuring range. <=0.20%.
2 Normative references
The following documents contain provisions which, through reference GB/T 22660 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revised edition are not adapted to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated references, the latest edition of this adaptation section.
GB/T 22660.1-2008 Chemical analysis methods of lithium fluoride - Part 1. Preparation and storage of test samples.
3 Method summary
Sample with sodium carbonate and boric acid mixed solvent melt, after acidification with hydroxylamine hydrochloride iron (III) reduction in acetate buffer medium (PH3.5 ~ pH4.2), iron (II) with o-phenanthroline to form a colored complex in a spectrophotometer at 510nm wavelength absorption measured
Luminosity.
4 Reagents
Anhydrous sodium carbonate 4.1. AR.
4.2 boric acid
AR.
4.3
HCl (1 + 1).
4.4
nitric acid (1 + 1).
4.5
hydroxylamine hydrochloride (10g/L).
4.6
phenanthroline solution (2.5g/L).
4.7
buffer solution (pH4.9). Weigh 272g of sodium acetate trihydrate were dissolved in 500mL of water, 240mL of glacial acetic acid was added (ca.
17.4mol/L).
4.8
sodium acetate solution (500g/L).
4.9
acetic acid (19 + 1).
4.10 ferric oxide standard stock solution
1mL containing 0.200mg ferric oxide, the following two ways can choose one.
4.10.1
Weigh 0.982g ferrous sulfate hexahydrate amine [Fe (NH4) 2 (SO4) 2 · 6H2O], placed in 100mL beaker, dissolved in water
After adding 20mL sulfuric acid (rho1.84g/mL), transferred to 1L volumetric flask, dilute to volume, and mix.
4.10.2
Weigh 0.200g at 600 °C ignition advance and cooled in the dryer ferric oxide [(Fe2O3) > 99.90%] to
On, placed in 100mL beaker, add 10mL of hydrochloric acid (rho1.19g/mL), was heated slowly until completely dissolved, cooled, transferred to 1L volumetric flask,
Dilute to volume, and mix.
4.11
ferric oxide standard solution.
Pipette 50.00mL ferric oxide standard stock solution (4.10), placed in 1L volumetric flask, dilute with water to volume, and mix. this […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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