GB/T 23278.6-2009 English PDF

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GB/T 23278.6-2009: Methods for chemical analysis of sodium stannate -- Part 6: Determination of free alkali content -- Titration
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 23278.6-2009	139	Add to Cart	3 days	Methods for chemical analysis of sodium stannate -- Part 6: Determination of free alkali content -- Titration	Valid

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Basic data

Standard ID: GB/T 23278.6-2009 (GB/T23278.6-2009)
Description (Translated English): Methods for chemical analysis of sodium stannate -- Part 6: Determination of free alkali content -- Titration
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G10
Classification of International Standard: 71.040.40
Word Count Estimation: 6,633
Date of Issue: 2009-01-05
Date of Implementation: 2009-11-01
Regulation (derived from): National Standard Approval Announcement 2009 No.2 (Total No.142)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the tin-free alkali sodium determination. This section applies to the determination of tin sodium free base. Measurement range of 0. 50% to 10. 00%.

GB/T 23278.6-2009: Methods for chemical analysis of sodium stannate -- Part 6: Determination of free alkali content -- Titration

---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.
Methods for chemical analysis of sodium stannate Part 6. Determination of free alkali content Titration. ICS 71.040.40 G10 National Standards of People's Republic of China Methods for chemical analysis of sodium stannate Part 6. Determination of the free base titration Posted 2009-01-05 2009-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 23278 "Methods for chemical analysis of sodium stannate" is divided into eight sections. --- Part 1. Determination of tin content potassium iodate titration; --- Part 2. Determination of iron content - 1,10-phenanthroline spectrophotometry; --- Part 3. Determination of arsenic content of arsenic and antimony molybdenum blue spectrophotometric method; --- Part 4. Determination of lead content - Atomic absorption spectrometry; --- Part 5. Determination of antimony content - Malachite green spectrophotometry; --- Part 6. Determination of the free base neutralization titration method; --- Part 7. alkali insolubles - Gravimetric method; --- Part 8. Determination of nitrate ion selective electrode method. Part is divided into 6 sections. This part is proposed by the China Nonferrous Metals Industry Association. The non-ferrous metal part by the National Standardization Technical Committee. This section from Yunnan Tin Group Co., Ltd. is responsible for drafting. This section is Liuzhou China Tin Group, Yunnan Honghe Prefecture CIQ participate in the drafting. The main drafters of this section. Yangzi Hua, Xie Hui-fang, Lin cream, Shou Jie Yun Jiang Village stretch, Hu Yu Wei. Methods for chemical analysis of sodium stannate Part 6. Determination of the free base titration

1 Scope

This section GB/T 23278 specifies the determination of tin in sodium free base. This section applies to tin sodium free base was measured for the range of 0.50% to 10.00%.

2 Method summary

The sample is dissolved in water. Tin and barium chloride, sodium, generating tin, barium precipitation, the free base with tin acid radical separation. Phenolphthalein as an indication Agents, titration with hydrochloric acid standard solution titration, determination of the amount of free base.

3 Reagents

Unless otherwise indicated, in the analysis using only three of the carbon dioxide-free distilled water. 3.1 barium chloride solution (200g/L). 3.2 phenolphthalein indicator solution (10g/L). 3.3 methyl red - bromocresol green indicator solution. 30mL bromocresol green solution (1g/L) and 20mL of methyl red ethanol solution (2g/L) mixing. 3.4 standard solution of sodium carbonate (Ba 1 = 0.015mol/L). Weigh 0.3975g reference sodium carbonate (to pre-drying at 270 ℃ ~ 300 ℃ Constant weight) in 200mL beaker with water to dissolve water soluble moved into 250mL volumetric flask and dilute to volume, and mix. 3.5 hydrochloric acid standard volumetric solution (Ba HCl = 0.02mol/L). 3.5.1 preparation. Pipette 9.0mL hydrochloric acid (ρ1.19g/mL), water injection 5000mL, and mix. 3.5.2 Calibration. Pipette 25.00mL (Vp 1) three standard solution of sodium carbonate (3.4), were placed in 300mL conical flask, add 10 drops Methyl red - bromomethyl cresol green indicator solution, shake, with hydrochloric acid standard volumetric solution (Vp 2) titration test solution from green to dark red, boiled 30s, cooled to room temperature and continue titration test solution to dark red. According to equation (1) calculate the actual concentration of hydrochloric acid standard titration solution of Ba. Ba = Ba 2 × 1 · 1 Vp Vp 2 (1) Where. Ba --- the actual concentration of hydrochloric acid standard titration solution, expressed in moles per liter (mol/L); Ba 1 --- standard solution of sodium carbonate concentration, expressed in moles per liter (mol/L); Pipette Vp 1 --- sodium carbonate standard solution volume in milliliters (mL of); Vp 2 --- Calibration consumption volume of hydrochloric acid standard titration solution, in milliliters (mL). When the result of poor parallel calibration is not more than three cups 5 × 10-5mol/L, averaging. Otherwise, re-calibration.

4 Sample

The sample should be sealed packaging. Step 5 Analysis 5.1 Sample Table 1. Weigh sample (m1), accurate to 0.0001g. ......

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