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YS/T 535.7-2009: Chemical analysis methods of sodium fluoride. Part 7: Determination of acidity. Neutral titration method
Status: Valid YS/T 535.7: Evolution and historical versions
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| YS/T 535.7-2009 | English | 149 |
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Chemical analysis methods of sodium fluoride. Part 7: Determination of acidity. Neutral titration method
| Valid |
YS/T 535.7-2009
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| YS/T 535.7-2006 | English | 199 |
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Methods for chemical analysis of sodium fluoride The neutral titration for the determination of acidity
| Obsolete |
YS/T 535.7-2006
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PDF similar to YS/T 535.7-2009
Basic data | Standard ID | YS/T 535.7-2009 (YS/T535.7-2009) | | Description (Translated English) | Chemical analysis methods of sodium fluoride. Part 7: Determination of acidity. Neutral titration method | | Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) | | Classification of Chinese Standard | H21 | | Classification of International Standard | 71.060.50 | | Word Count Estimation | 5,585 | | Date of Issue | 2009-12-04 | | Date of Implementation | 2010-06-01 | | Older Standard (superseded by this standard) | YS/T 535.7-2006 | | Quoted Standard | YS/T 535.10-2009 | | Regulation (derived from) | MIIT [2009] No. 66 | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Summary | This standard specifies the NaF acidity (expressed in hydrogen fluoride) measurement method. This standard applies to sodium fluoride in acidity (expressed in hydrogen fluoride) determination. Measuring range (mass fraction): �� 1. 00%. | YS/T 535.7-2009: Chemical analysis methods of sodium fluoride. Part 7: Determination of acidity. Neutral titration method
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Chemical analysis methods of sodium fluoride. Part 7. Determination of acidity.Neutral titration method
ICS 71.060.50
H21
People's Republic of China Nonferrous Metals Industry Standard
Replacing YS/T 535.7-2006
Chemical analysis of sodium fluoride
Part 7. determination of acidity and neutralization method
2009-12-04 released
2010-06-01 Implementation
Issued by the Ministry of Industry and Information Technology of the People's Republic of China
Foreword
YS/T 535 "sodium fluoride chemical analysis method" is divided into 10 parts.
- Part 1. Determination of wet water content - Weight method;
- Part 2. Determination of fluorine content - Distillation - thorium nitrate titration capacity method;
- Part 3. Determination of silicon content - Molybdenum blue spectrophotometric method;
- Part 4. Determination of iron content - o - phenanthroline spectrophotometric method;
- Part 5. Determination of soluble sulfate content - Turbidimetric method;
- Part 6. Determination of carbonate content - Gravimetric method;
- Part 7. Determination of acidity and neutral method;
- Part 8. Determination of water insoluble content - Gravimetric method;
- Part 9. Determination of chlorine content - Turbidimetric method;
- Part 10. Preparation and storage of specimens.
This section is part 7.
This part replaces YS/T 535.7-2006 (original GB/T 8158.7-1987).
This part is the YS/T 535.7-2006 "sodium fluoride chemical analysis method neutralization method of acidity" revision, and YS/T 535.7-
2006 compared to increase the precision and quality assurance and control and so on.
This part of the National Nonferrous Metals Standardization Technical Committee proposed and centralized.
This part is drafted by Fushun Aluminum Co., Ltd. and China Nonferrous Metals Industry Standard Measurement Quality Research Institute.
This part is drafted by Fushun Aluminum Company Limited.
This part of the main drafters. Wang Yuling, Xu Tieling, Wu Yuchun.
This part of the previous version of the standard to replace the release of the situation.
YS/T 535.7-2006 (original GB/T 8158.7-1987).
Chemical analysis of sodium fluoride
Part 7. determination of acidity and neutralization method
1 Scope
This section specifies the determination of acidity (expressed as hydrogen fluoride) in sodium fluoride.
This part applies to the determination of acidity (expressed as hydrogen fluoride) in sodium fluoride. Determination range (mass fraction). ≤1.00%.
2 normative reference documents
The terms of this document are incorporated by reference in this section and become part of this section. Whichever is the date of the reference file, which is followed by all
(Excluding corrigenda) or revisions do not apply to this part, however, encourage parties to reach an agreement under this section
Whether you can use the latest version of these files. For undated references, the latest edition applies to this section.
Methods for chemical analysis of sodium fluoride - Part 10. Preparation and storage of samples YS/T 535.10-2009
3 method summary
After the sample was dissolved in water, the acidity was measured by acid-base neutralization in the presence of potassium chloride.
4 reagent
4.1 Potassium chloride. Saturated solution.
4.2 phenolphthalein ethanol solution (10g/L).
4.3 no carbon dioxide distilled water. the distilled water to boil for 20min, after cooling stored in glass bottles, with a lime lime attached to the stopper
Cover it.
4.4 sodium hydroxide standard solution (0.2500mol/L), prepared as follows.
4.4.1 Preparation. Weigh 10 g of sodium hydroxide, placed in a polyethylene cup, add 100 mL of water, dissolve it, and then move into a 1 L volumetric flask
, Diluted with water to the mark, mix well. Immediately move into a polyethylene bottle.
4.4.2 Calibration. phenolphthalein as an indicator, with 0.2500mol/L standard hydrochloric acid solution calibration.
Calculate the actual concentration of sodium hydroxide standard titration solution according to formula (1)
C = c0 × V 1 V 2
(1)
Where.
C - the actual concentration of sodium hydroxide standard titration solution in moles per liter (mol/L);
C0 - the concentration of hydrochloric acid standard solution in moles per liter (mol/L);
V 1 --- Remove the volume of hydrochloric acid standard solution in milliliters (mL);
V 2 --- titration, titration hydrochloric acid standard solution consumed sodium hydroxide standard titration solution volume, in milliliters (mL).
5 instruments
General laboratory equipment.
6 samples
The specimen shall comply with the requirements of 4.2 of YS/T 535.10-2009.
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