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GB/T 23278.8-2009 English PDF

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GB/T 23278.8-2009: Methods for chemical analysis of sodium stannate -- Part 8: Determination of nitrate content -- Ion selective electrode method
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GB/T 23278.8-2009English139 Add to Cart 3 days [Need to translate] Methods for chemical analysis of sodium stannate -- Part 8: Determination of nitrate content -- Ion selective electrode method Valid GB/T 23278.8-2009

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Basic data

Standard ID GB/T 23278.8-2009 (GB/T23278.8-2009)
Description (Translated English) Methods for chemical analysis of sodium stannate -- Part 8: Determination of nitrate content -- Ion selective electrode method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G10
Classification of International Standard 71.040.40
Word Count Estimation 6,699
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 method for the determination of tin sodium nitrate. This section applies to the determination of tin sodium nitrate. Measurement range 0. 020% -0. 60%.

GB/T 23278.8-2009: Methods for chemical analysis of sodium stannate -- Part 8: Determination of nitrate content -- Ion selective electrode method


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Methods for chemical analysis of sodium stannate Part 8. Determination of nitrate content Ion selective electrode method ICS 71.040.40 G10 National Standards of People's Republic of China Methods for chemical analysis of sodium stannate Part 8. Determination of nitrate content Ion Selective Electrode 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. This section section 8. 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 Co., Ltd., Yunnan Honghe SAIEC IQ participate in the drafting. The main drafters of this section. Zhao Rulin, Highland, Zhang Hongling, Cai Qian, Bai Yanhua, Lin cream, Qinyu Qiu, Zhang. Methods for chemical analysis of sodium stannate Part 8. Determination of nitrate content Ion Selective Electrode

1 Scope

This section GB/T 23278 specifies the method for the determination of tin in sodium nitrate. This section applies to the determination of tin in sodium nitrate, was measured in the range of 0.020% to 0.60%.

2 Method summary

Sample completely decomposed with water, with dilute sulfuric acid and to completely precipitate was filtered, nitrates and Sn (Ⅳ) separation, then pH4 ~ pH5 Aluminum sulfate - silver sulfate - boric acid - amino acid medium to film nitrate ion electrode as indicator electrode with ion meter or pH/mV measurements Measured nitrate.

3 Reagents

Test water for the three distilled water. 3.1 Stannous sulfate. 3.2 sulfate (1 + 1). 3.3 sulfate (5 + 1). 3.4 Sodium hydroxide solution (200g/L). Aluminum sulfate 3.5 - silver sulfate - boric acid solution. Weigh 16.7g of aluminum sulfate [Al2 (SO4) 3 · 18H2O], 4.7g silver sulfate, 1.2g of boric acid, It was dissolved in 900mL of water, diluted with water to 1000mL, stored in a brown bottle. 3.6 sulfamic acid solution (25g/L). 3.7 methyl orange solution (1g/L). 3.8 Storage nitrate standard solution. Weigh 4.0775g potassium nitrate (at 120 ℃ ~ 130 ℃ drying to constant weight), placed in 250mL beaker Added 20mL of water was dissolved and transferred to 250mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 10mg of nitrate (NO-3). 3.9 nitrate standard solution A. Pipette 50.00mL nitrate standard stock solution (3.8) in 500mL volumetric flask, dilute to the mark with water Degree, and mix. 1mL solution containing 1mg nitrate (NO-3). 3.10 nitrate standard solution B. Pipette 50.00mL nitrate standard solution (3.9) in 500mL volumetric flask, dilute to the mark with water Degree, and mix. This solution 1mL containing 0.1mg nitrate (NO-3).

4 Instrument

4.1 nitrate ion selective electrode. Requires nitrate content in 10-2mol/L ~ 10-4mol/L, the negative electrode potential and the logarithm of the concentration A linear relationship. Before using the electrode should be pulled out of the protective cover, and then washed with water to the potential value of greater than 300mV above were measured. 4.2 reference electrode. 4.3 ion meter or pH/mV meter. accuracy 0.1mV. 4.4 magnetic stirrer.

5 Sample

The sample should be sealed packaging.

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