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GB/T 13025.11-2012: General test method in salt industry -- Determination of fluoride
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 13025.11-2012	English	149	Add to Cart	2 days [Need to translate]	General test method in salt industry -- Determination of fluoride
GB/T 13025.11-1994	English	199	Add to Cart	2 days [Need to translate]	General test method in salt industry-Determination of fluorine

GB/T 13025.11-2012: General test method in salt industry -- Determination of fluoride

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General test method in salt industry.Determination of fluoride ICS 71.060.50 X35 National Standards of People's Republic of China Replace GB/T 13025.11-1994 General test methods for salt industry - Determination of fluorine 2012-06-29 release 2012-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released

Foreword

This part is one of the series of standards for general testing methods for the salt industry. This series of standards is currently divided into the following 13 parts. If necessary, other tests The methodological criteria will be supplemented by follow-up work. GB/T 13025.1 General test methods for salt industry - Determination of particle size; GB/T 13025.2 General test methods for salt industry - Determination of whiteness; GB/T 13025.3 General test methods for salt industry - Determination of moisture; GB/T 13025.4 General test methods for salt industry - Determination of water insoluble matter; GB/T 13025.5 General test methods for salt industry - Determination of chloride ion; GB/T 13025.6 General test methods for salt industry - Determination of calcium and magnesium; GB/T 13025.7 General test methods for salt industry - Determination of iodine; GB/T 13025.8 General test methods for salt industry - Determination of sulfate; GB/T 13025.9 General test methods for salt industry - Determination of lead; GB/T 13025.10 General test methods for salt industry - Determination of ferrous cyanide; GB/T 13025.11 General test methods for salt industry - Determination of fluorine; GB/T 13025.12 General test methods for salt industry - Determination of barium; General test methods for salt industry - Determination of arsenic GB/T 13025.13. This part is part 11 of GB/T 13025. This part is based on the rules of GB/T 1.1-2009. This part of the GB/T 13025.11-1994 "Salt Industry General Test Method Determination of fluoride ion", this part and GB/T 13025.11-1994 compared to the main editorial changes. This part of the China Light Industry Federation, the National Salt Standardization Technical Committee. This part of the drafting unit. National Hai Lake Salt Standardization Center. The main drafters of this part. Tong Yunkun, Ren Qing test. This part of the previous version of the release of the situation. --- GB/T 13025.11-1994. General test methods for salt industry - Determination of fluorine

1 Scope

This part of GB/T 13025 specifies the method for the determination of fluorine content in salt products by ion selective electrode method. This part applies to the determination of fluorine content in salt products.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Analysis of laboratory water specifications and test methods GB/T 6682-2008

3 principle

Fluoride ion selective electrode and saturated calomel electrode into the sample solution, the potential difference between the two electrodes with the solution of fluoride ion concentration and change The change of the change of potential and potential difference is in accordance with the Nernst equation, and the content of fluorine in the sample is determined by standard addition method.

4 reagent

4.1 Reagent specifications Unless otherwise stated, only the reagents identified as analytical reagents and the tertiary water specified in GB/T 6682-2008 are used in the analysis. 4.2 acetic acid - sodium acetate buffer solution Weigh 8.60g of anhydrous sodium acetate and 0.30g of sodium citrate (Na3C6H5O7 · 2H2O), add water, add 1.50mL of glacial acetic acid, Diluted to 1L. 4.3 sodium fluoride standard solution 4.3.1 stock solution Weigh 1.105g at 110 ℃ ± 2 ℃ dry to constant weight of sodium fluoride dissolved in water, into the 500mL volumetric flask, add water dilute to the scale, Shake, immediately transferred to the polyethylene plastic bottle to save. The solution concentration is ρ (F) = 1.000 mg/mL. 4.3.2 working fluid Accurately absorb 10mL of the above stock solution (4.3.1) in 100mL volumetric flask, diluted with water to the mark, shake, immediately transferred to the poly The plastic bottles are kept in plastic. The solution concentration is ρ (F) = 100 μg/mL.

5 instruments

5.1 ion meter (or pH meter). reading error ≤ 2mV. ...