GB/T 7376-2008Determination of micro-amounts of water in industrial Fluorinated alkane (English PDF)
工业用氟代烷烃中微量水分的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
April 10, 2008
Implementation date
October 1, 2008
Scope
GB/T 7376-2008 is the English-translated version of 工业用氟代烷烃中微量水分的测定.
GB/T 7376-2008 is the Chinese standard "Determination of micro-amounts of water in industrial Fluorinated alkane". Its scope clause reads: This standard specifies the test methods for industrial use fluorinated alkanes in trace moisture measurement.
Karl Fischer method --- volumetric method, Karl Fischer Law --- Coulomb law and electrolysis. Electrolysis does not apply to a relatively high boiling point fluorinated alkanes.
This standard applies to industrial use - Determination fluorinated alkanes trace of moisture. Its clauses include general provisions; test methods.
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Document preview — GB/T 7376-2008
National Standard of the People's Republic of China
- ICS
- 71.080.20
- Classification
- G 17
- Replacing
- GB/T 7374-1987
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 General Provisions
- 5 Test methods
1 Scope
This standard specifies the test methods for industrial use fluorinated alkanes in trace moisture measurement. Karl Fischer method --- volumetric method, Karl Fischer
Law --- Coulomb law and electrolysis. Electrolysis does not apply to a relatively high boiling point fluorinated alkanes.
This standard applies to industrial use - Determination fluorinated alkanes trace of moisture.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 6283-1986 Determination of moisture content of chemical products Karl Fischer method (General method)
GB/T 6682-1992 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)
3 General Provisions
3.1
Unless otherwise stated in the analysis using only recognized as analytical reagents and GB/T 6682-1992 specified in the third grade water.
Trace moisture measuring apparatus used in the tests 3.2 should ensure that seal. Each vent should be connected to a drying tube, the desiccant should be replaced.
3.3
test used in the sample cylinders, sampling catheters and needles and other equipment should be dry to avoid measurement error.
3.4
test method requires mixing, stirring speed should be consistent; consistent end judgment; avoid large measurement error.
Sampling and sample pretreatment 4
According to relevant provisions of the standard product.
5 Test methods
5.1 Warning
Some test procedures prescribed test method can lead to dangerous situations. The operator shall take appropriate safety and health practices.
5.2 Karl Fischer volumetric method ---
5.2.1 Method summary
Sample water and Karl Fischer reagent quantitative reaction. Karl Fischer reagent with water beforehand accurately calibrate its titer to "dead stop
Point "to judge the end. Milliliters consumption and its titer Karl Fischer reagent according to titration, calculate the content of water in the sample.
Reaction. H2O + I2 + SO2 + 3C5H5N + CH3OH = 2C5H5N · HI + C5H5NH · SO4CH3 (light tan)
5.2.2 Instruments
5.2.2.1 Sample Cylinders
double-valve-type small stainless steel cylinder capacity of not less than 150mL, working pressure greater than 3.0MPa, see schematic
Figure 1.
Figure 1 Sample Cylinders schematic […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Cited by
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- GB/T 33386-20162,3,3,3-Tetrafluoropropene(HFO-1234yf) for industrial use
- GB/T 33387-2016Trans-1,3,3,3-tetrafluoropropene[HFO-1234ze(E)] for industrial use
- HG/T 4633-2014Pentafluoroethane (HFC-125) for industrial use
- HG/T 4634-2014Difluoromethane (HFC-32) for industrial use
- HG/T 4794-20141,1,1-Trifluoroethane (HFC-143a) for industrial use
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Editions of GB/T 7376
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 7376-2008 | Determination of micro-amounts of water in industrial Fluorinated alkane | current edition | Current |
| GB/T 7374-1987 | Determination of micro-amounts of water in industrial Fluorinated alkane | previous edition | Superseded |
This page sells the current edition, GB/T 7376-2008. Earlier editions are listed for reference only.
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