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YS/T 535.2-2025 PDF English

YS/T 535.2: Evolution and historical versions

Std ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status
YS/T 535.2-2025	English	RFQ	ASK	3 days [Need to translate]	(Determination of chemical content of sodium fluoride - Part 2: Determination of fluoride content - Distillation-thorium nitrate titration method)	Valid
YS/T 535.2-2009	English	169	Add to Cart	3 days [Need to translate]	Chemical analysis methods of sodium fluoride. Part 2: Determination of fluorine content. Distillation-thorium nitrate volumetric method	Valid
YS/T 535.2-2006	English	199	Add to Cart	2 days [Need to translate]	Methods for chemical analysis of sodium fluoride The distillation-nitric thorium volumetric method for the determination of fluorine content	Obsolete

Standard similar to YS/T 535.2-2025

GB/T 6609.27 | YS/T 575.21 | GB/T 23615.1 | YS/T 535.3 | YS/T 535.11 | YS/T 535.10 |

Basic data

Standard ID	YS/T 535.2-2025 (YS/T535.2-2025)
Description (Translated English)	(Determination of chemical content of sodium fluoride - Part 2: Determination of fluoride content - Distillation-thorium nitrate titration method)
Sector / Industry	Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard	H30
Classification of International Standard	77.100.10
Date of Issue	2025-08-19
Date of Implementation	2026-03-01
Older Standard (superseded by this standard)	YS/T 535.2-2009
Issuing agency(ies)	Ministry of Industry and Information Technology
Summary	This standard specifies the method for determining the fluoride content in sodium fluoride using distillation-thorium nitrate titration. This standard is applicable to the determination of fluoride content in sodium fluoride.

YS/T 535.2-2009: Chemical analysis methods of sodium fluoride. Part 2: Determination of fluorine content. Distillation-thorium nitrate volumetric 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 2. Determination of fluorine content.Distillation-thorium nitrate volumetric method ICS 71.060.50 H21 People's Republic of China Nonferrous Metals Industry Standard Replacing YS/T 535.2-2006 Methods for chemical analysis of sodium fluoride Part 2. Determination of fluorine content Distillation - thorium nitrate titration volumetric 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 2. The partial replacement of YS/T 535.2-2006 (formerly GB/T 8158.2-1987). This part is YS/T 535.2-2006 "Methods for chemical analysis of sodium fluoride distillation - thorium nitrate volumetric method for the determination of fluorine content" amendments and YS/T 535.2-2006 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. count Jubilee, Zhou Yanna, sheets side by side. This part of the standard replaces the previous editions are. --- YS/T 535.2-2006 (formerly GB/T 8158.2-1987). Methods for chemical analysis of sodium fluoride Part 2. Determination of fluorine content Distillation - thorium nitrate titration volumetric method

1 Scope

This section provides sodium fluoride determination of fluorine content. This section applies to the determination of fluorine content in sodium fluoride. Measurement range (mass fraction). 40% to 60%.

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 sodium fluoride preparation and storage of chemical analysis - Part 10 samples

3 Method summary

Sample in sulfuric acid or perchloric acid medium, by steam distillation of fluorine to alizarin sulfonate methylene blue as indicator, with a thorium nitrate solution Titrated.

4 Reagents

4.1 perchloric acid (ρ1.60g/mL). 4.2 hydrochloric acid solution (0.06mol/L). 4.3 sulfate (2 + 1). 4.4 Sodium hydroxide solution (20g/L). 4.5 buffer. pH2.7. Weigh 9.45g of chloroacetic acid dissolved in 50mL of sodium hydroxide solution (1mol/L), and diluted with water to 100mL, and mix. 4.6 thorium nitrate standard solution, proceed as follows. 4.6.1 preparation. Weigh 9.45g of thorium nitrate tetrahydrate [Th (NO3) 4 · 4H2O] or other equivalent quality thorium nitrate hydrate dissolved in water, And diluted to 1L, mix the next calibration. Concentration of this solution was about 0.068 moles per liter (C1/4Th (NO3) 4 = 0.068mol/L). 4.6.2 Calibration. Weigh and pre-cooled at 600 ℃ burning in a dryer exceptionally pure anhydrous sodium 0.2000g, with 20mL ~ Water containing 30mL transferred several glass balls (diameter 2mm ~ 3mm) distillation flask (5.2.1) in. Press the following analysis steps 7.4.2 ~ 7.4.3 conduct. While doing the blank test. 4.6.3 according to formula (1) to calculate the concentration of thorium nitrate standard solution. C1/4Th (NO3) 4 = (Vp 1- Vp 2) × 41.99 (1) Where. C1/4Th (NO3) 4 --- thorium nitrate standard titration solution molar concentration of units of moles per liter (mol/L); Volume consumed Vp 1 --- Calibration thorium nitrate standard solution, in milliliters (mL); 2 --- consumed Vp thorium nitrate standard blank test solution volume in milliliters (mL of);