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GB/T 22104-2008 English PDF

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GB/T 22104-2008: Soil quality -- Analysis of fluoride -- Ion selective electrometry
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GB/T 22104-2008English139 Add to Cart 3 days [Need to translate] Soil quality -- Analysis of fluoride -- Ion selective electrometry Valid GB/T 22104-2008

PDF similar to GB/T 22104-2008


Standard similar to GB/T 22104-2008

GB/T 22105.2   GB/T 22105.3   GB/T 22105.1   

Basic data

Standard ID GB/T 22104-2008 (GB/T22104-2008)
Description (Translated English) Soil quality -- Analysis of fluoride -- Ion selective electrometry
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Z18
Classification of International Standard 13.080.05
Word Count Estimation 6,675
Date of Issue 2008-06-27
Date of Implementation 2008-10-01
Regulation (derived from) Announcement of Newly Approved National Standards No. 10 of 2008 (total 123)
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 determination of fluoride in soil ion selective electrode method, This standard applies to ion- selective electrode method for the determination of fluoride content in the soil, the standard method detection limit of 2. 5��g.

GB/T 22104-2008: Soil quality -- Analysis of fluoride -- Ion selective electrometry

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Soil quality. Analysis of fluoride. Ion selective electrometry ICS 13.080.05 Z18 National Standards of People's Republic of China Determination of soil quality fluoride Ion Selective Electrode Posted 2008-06-27 2008-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is proposed and managed by the People's Republic of China Ministry of Agriculture. This standard was drafted. Ministry of Agriculture, the Environmental Protection Institute, Guangxi agricultural environment monitoring station. The main drafters of this standard. Liu Chi, XU Ya-ping, war Xinhua, Cai Yanming, Liu Yan, Liu Ming. Determination of soil quality fluoride Ion Selective Electrode

1 Scope

This standard specifies the determination of soil fluoride ion selective electrode method. This standard applies to the determination of fluoride content in soil ion selective electrode method. The detection limit of this method is standard 2.5μg. Principle 2 When the fluorine electrode and the test solution in contact with the electrode potential relationship solution of fluorine ion activity generated obey the Nernst (Nernst) equation. E = E0-Slog Ba F- Where. E --- measured electrode potential; E0 --- reference potential (fixed value) than the electrode; S --- slope fluorine electrode; ---- F Ba concentration of fluoride ions in solution. When the control test solution total ionic strength is constant, it changes with the electrode potential of fluorine ion concentration in the test solution varies, E and Ba F- log linear relationship. That will generally total ionic strength buffer solution was added, to eliminate or reduce the ion concentrations of different sizes gravity Difference to the activity coefficient is 1, with a concentration in place of activity. Samples with sodium hydroxide at high temperatures melted with hot water extraction, and adding an appropriate amount of hydrochloric acid, so that there is interference cations into insoluble Hydroxide, after removing the clarified solution is adjusted to a near neutral pH, under conditions of total ionic strength buffer solution exists, the direct use of electrical fluoro Pole method.

3 Reagents

The reagents used in this standard, unless otherwise indicated, reagents were of analytical grade, the water is deionized water or fluorine-free distilled water. 3.1 (1 + 1) hydrochloric acid solution. 3.2 Sodium hydroxide (solid). tabular grains. 3.3 0.2mol/L sodium hydroxide solution. Weigh 0.80g of sodium hydroxide, dissolved in water, dilute with water to 100mL. 3.4 0.04% bromocresol purple indicator. bromocresol purple weighed 0.10g, 9.25mL dissolved in sodium hydroxide solution (3.3), diluted with water to 250mL. 3.5 total ionic strength buffer solution (TISAB) 3.5.1 1mol/L sodium citrate (TISABⅠ). weigh 294g sodium citrate (Na3C6H5O7 · 2H2O) in 1000mL beaker In about 900mL of water was added to dissolve, using hydrochloric acid solution (3.1) pH to 6.0 to 7.0, transferred to 1000mL volumetric flask, diluted with water To the mark, shake. 3.5.2 1mol/L hexamethylenetetramine -1mol/L potassium nitrate -0.15mol/L Tiron (TISABⅡ). Weigh 140.2g six Methylene tetraamine [(CH2) 6N4], 101.1g potassium nitrate (KNO3) and 49.8g Tiron (C6H4Na2O8S2 · H2O), add water-soluble Solution, adjusting the pH to 6.0 to 7.0, into 1000mL volumetric flask, dilute to the mark with water, shake well.

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