YS/T 535.3-2024 English PDF

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
YS/T 535.3-2024	RFQ	ASK	3 days	(Chemical analysis method of sodium fluoride - Part 3: Determination of silicon dioxide content - Rail expansion and contraction adjuster)	Valid
YS/T 535.3-2009	239	Add to Cart	3 days	Chemical analysis methods of sodium fluoride. Part 3: Determination of silica content. Molybdenum blue photometric method	Obsolete
YS/T 535.3-2006	199	Add to Cart	2 days	Methods for chemical analysis of sodium fluoride The molybdenum blue photometric method for the determination of silica content	Obsolete

Basic data

Standard ID: YS/T 535.3-2024 (YS/T535.3-2024)
Description (Translated English): (Chemical analysis method of sodium fluoride - Part 3: Determination of silicon dioxide content - Rail expansion and contraction adjuster)
Sector / Industry: Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard: H30
Classification of International Standard: 71.100.10
Date of Issue: 2024-10-24
Date of Implementation: 2025-05-01
Older Standard (superseded by this standard): YS/T 535.3-2009
Issuing agency(ies): Ministry of Industry and Information Technology
Summary: This standard specifies the method for determining the silicon dioxide content in sodium fluoride by molybdenum blue spectrophotometry. This standard is applicable to the determination of silicon dioxide content in sodium fluoride, with a determination range of 0.020% to 1.60%.

YS/T 535.3-2009: Chemical analysis methods of sodium fluoride. Part 3: Determination of silica content. Molybdenum blue photometric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemical analysis methods of sodium fluoride.Part 3. Determination of silica content.Molybdenum blue photometric method ICS 71.060.50 H21 People's Republic of China Nonferrous Metals Industry Standard Replacing YS/T 535.3-2006 Methods for chemical analysis of sodium fluoride Part 3. Determination of silicon content Molybdenum blue spectrophotometric method Posted 2009-12-04 2010-06-01 implementation Ministry of Industry and Information Technology of the People's Republic of China released

Foreword

YS/T 535 "chemical analysis of sodium fluoride" is divided into 10 parts. --- Part 1. Determination of the weight of water in the wet method; --- Part 2. Determination of distillation of fluorine content - thorium nitrate titration volumetric method; --- Part 3. Determination of silicon content - Molybdenum blue spectrophotometric method; --- Part 4. Determination of iron content phenanthroline spectrophotometry; --- Part 5. Determination of soluble sulfate turbidity method; --- Part 6. Determination of carbonate content - Gravimetric method; --- Part 7. Determination of acidity and law; --- Part 8. Water-insoluble content - Gravimetric method; --- Part 9. Determination of chlorine turbidity method; --- Part 10. Preparation and storage of test samples. This is Part 3. The partial replacement of YS/T 535.3-2006 (formerly GB/T 8158.3-1987). This part is YS/T 535.3-2006 "spectrophotometric determination of fluoride chemical analysis of molybdenum blue silicon amount" of amendments, and YS/T 535.3-2006 increased compared to the like precision and quality assurance and control content. The non-ferrous metal part by the National Standardization Technical Committee and centralized. This part of the Fushun Aluminum Co., Ltd., China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. This part of the Fushun Aluminum Co. drafted. The main drafters of this section. The original Jianchang, new Feng Ying, Yang Limei. This part of the standard replaces the previous editions are. --- YS/T 535.3-2006 (formerly GB/T 8158.3-1987). Methods for chemical analysis of sodium fluoride Part 3. Determination of silicon content Molybdenum blue spectrophotometric method

1 Scope

This section provides the fluoride content of silicon (silica represented) measurement method. This section applies to the determination of silicon content in sodium fluoride (silica shown). Measurement range (mass fraction). 0.02 to 1.00%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section. YS/T 535.10-2009 Methods for chemical analysis of sodium fluoride - Part 10. Sample preparation and storage

3 Method summary

Sodium carbonate and boric acid sample with molten mixture, acidified, fractionated test solution adjusted to a pH of 0.85 to 0.90, the formation of silicon molybdate yellow Color silicon molybdenum heteropoly acid, sulfuric acid medium and high acidity in the presence of tartaric acid, with a reducing agent to a silicon molybdenum blue at 815nm wavelength spectrophotometer Measured absorbance.

4 Reagents

4.1 anhydrous sodium carbonate. 4.2 boric acid. 4.3 nitric acid solution (8mol/L). 4.4 Sodium molybdate solution (195g/L). Weigh 19.5g of sodium molybdate dihydrate cup set polytetrafluoroethylene, heated, dissolved in water, cooled and diluted to 100mL, and mix. This storage is a solution in a polyethylene bottle. 4.5 tartaric acid solution (100g/L). Weigh 10g of tartaric acid dissolved in water, dilute to 100mL mixing, the solution was stored in a polyethylene Bottle. 4.6 sulfuric acid solution (8mol/L). 4.7 reducing solution. optionally following a solution. 4.7.1 1- amino-2-naphthol 4-sulfonic acid solution. Weigh 7g of anhydrous sodium sulfite was dissolved in 50mL water and adding ammonia 1.5g1- 4-sulfonic acid-2-naphthol. Another weighed 90g polyvinylidene sodium (NaS2O5) was dissolved in 900mL of water. The two solutions were mixed, diluted to 1L, Mix well. The solution was stored in a brown bottle in a cool place. 4.7.2 ascorbic acid solution (20g/L), the use of the preparation. 4.8 silica standard stock solution. Weigh 0.5000g previously burning 1h at 1000 ℃, and the dryer to cool silica (99.9%), placed in a platinum crucible. To crucible 5g of sodium carbonate (4.1) and mix with a platinum spoon, add 950 ℃ high temperature furnace carefully Molten (about 10min), cooled, water was added, gently warmed until complete dissolution, cooling, the solution was carefully transferred to 1L volume, washed with water Dilute to volume, mix, and immediately poured into a polyethylene bottle. This standard solution 1mL containing 0.500mg silica. 4.9 silica standard solution. Pipette 40.0mL silica standard stock solution (4.8), into 1000mL volumetric flask with water Dilute to volume, and mix. The solution 1mL containing 0.020mg of silica, when formulated using. ......

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