GB/T 8151.2-2012Methods for chemical analysis of zinc concentrates - Part 2: Determination of sulfur content - The combustion neutralization titrimetric method (English PDF)
锌精矿化学分析方法 第2部分：硫量的测定 燃烧中和滴定法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 31, 2012
Implementation date
October 1, 2013
Scope
GB/T 8151.2-2012 is the English-translated version of 锌精矿化学分析方法 第2部分：硫量的测定 燃烧中和滴定法.
GB/T 8151.2-2012 is the Chinese standard "Methods for chemical analysis of zinc concentrates - Part 2: Determination of sulfur content - The combustion neutralization titrimetric method".
Its scope clause reads: This section GB/T 8151 provides for determination of sulfur content of zinc concentrates. This section applies to the determination of zinc in concentrate sulfur content measurement range. 20.00% - 40.00%. Its clauses include method summary; reagents.
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Document preview — GB/T 8151.2-2012
National Standard of the People's Republic of China
- ICS
- 77.120.60
- Classification
- H 13
- Replacing
- GB/T 8151.2-1987
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Method summary
- 3 Reagents
- 3.8 potassium permanganate - sodium hydroxide solution
- 3.9 absorbed hydrogen peroxide solution
1 Scope
This section GB/T 8151 provides for determination of sulfur content of zinc concentrates.
This section applies to the determination of zinc in concentrate sulfur content measurement range. 20.00% - 40.00%.
2 Method summary
High temperature combustion of oxygen in the sample stream, so that oxidation of sulfides, sulfates decompose to sulfur dioxide, to hydrogen peroxide solution and an oxygen absorbing
Into sulfuric acid and methyl red and methylene blue mixed indicator, titrated with sodium hydroxide standard solution titration solution from purple to green
As the end point.
Technical conditions prescribed amount of coexisting elements do not interfere with the determination of sulfur.
3 Reagents
Unless otherwise indicated in the analysis using only recognized as analytical reagent and distilled or deionized water or equivalent purity.
3.1
sodium hydroxide.
3.2
discoloration silica gel.
3.3
copper oxide, powder.
3.4
Qianfen (wPb>=99.99%).
3.5
sulfate (rho1.84g/mL).
3.6
sulfuric acid (11), pure class distinctions.
3.7
nitric acid (13), pure class distinctions.
3.8 potassium permanganate - sodium hydroxide solution
Weigh 3.0g of potassium permanganate dissolved in 100mL of water, 10g of sodium hydroxide (3.1), dissolved
Solution, wash load cylinders.
3.9 absorbed hydrogen peroxide solution
1000mL 50mL solution containing hydrogen peroxide [30% (mass fraction)], add 1mL mixed indicator (3.12), standard titration with sodium hydroxide solution (3.11) and sulfuric acid (119) was just green solution was adjusted (limited to use within 1 week).
Lead sulfate benchmark 3.10 reagents. Weigh 20g of lead oxide (3.4) in the 500mL beaker, add 30mL of nitric acid (3.7) was dissolved, to be reacted
After completion of the suspended matter was removed by filtration, was added 20mL sulfuric acid (3.6), after 2h by sedimentation speed quantitative filter paper, washed with distilled water until neutral,
Drying in an oven, into a porcelain crucible, burning in a muffle furnace 780 °C 1h, remove the coolish desiccator. After the room out into RESEARCH
A mortar, add muffle furnace 780 °C 1h after burning out, into the dryer as a standard substance.
3.11
sodium hydroxide standard titration solution (approximately 0.1mol/L).
3.11.1 preparation
7mL sodium hydroxide solution (400g/L) placed in a 1L plastic bucket with boiled and cooled distilled water to
1L, and mix.
3.11.2 Calibration
Accurately weigh 0.4000g lead sulphate reference reagent (3.10) in the porcelain boat, covering 0.5g copper oxide (3.3), according to analysis
Simultaneous calibration record volume consumption of sodium hydroxide.
According to equation (1) to calculate the concentration of sodium hydroxide standard titration solution.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 8151.2
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 8151.2-2012 | Methods for chemical analysis of zinc concentrates - Part 2: Determination of sulfur content - The combustion neutralization titrimetric method | current edition | Current |
| GB/T 8151.2-1987 | Methods for chemical analysis of zinc concentrates - Part 2: Determination of sulfur content - The combustion neutralization titrimetric method | previous edition | Superseded |
This page sells the current edition, GB/T 8151.2-2012. Earlier editions are listed for reference only.
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