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GB/T 32954-2016: Determination of fluoride content for fertilizers -- Ion selective electrode method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 32954-2016 | English | 139 |
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Determination of fluoride content for fertilizers -- Ion selective electrode method
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GB/T 32954-2016
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Basic data | Standard ID | GB/T 32954-2016 (GB/T32954-2016) | | Description (Translated English) | Determination of fluoride content for fertilizers -- Ion selective electrode method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G20 | | Classification of International Standard | 65.080 | | Word Count Estimation | 7,776 | | Date of Issue | 2016-08-29 | | Date of Implementation | 2017-03-01 | | Regulation (derived from) | National Standard Announcement 2016 No.14 | | 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 | GB/T 32954-2016: Determination of fluoride content for fertilizers -- Ion selective electrode method
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Determination of fluoride content for fertilizers - Ion selective electrode method
ICS 65.080
G20
National Standards of People's Republic of China
Determination of Fluoride in Fertilizers
Ion selective electrode method
2016-08-29 released
2017-03-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed by the China Petroleum and Chemical Industry Association.
This standard is regulated by the National Technical Committee on Standardization of Fertilizers and Soil Conditioners (SAC/TC105).
The drafting of this standard. Shandong Nongda Fertilizer Industry Technology Co., Ltd., Shandong Province Product Quality Inspection Research Institute, Shanghai Chemical Industry Research Institute, the state
Fertilizer Quality Supervision and Inspection Center (Shandong), Heilongjiang Province Quality Supervision and Testing Institute.
The main drafters of this standard. Ding Fangjun, Zhang Juan, Lin Jian, Huang Bo, Xu Shiming, Liu Yufeng, Huang Jing, Dou Xingxia.
Determination of Fluoride in Fertilizers
Ion selective electrode method
WARNING. The hydrochloric acid solution in the reagents used in this standard is corrosive and should be properly protected by the test personnel. This standard does not indicate all
Possible safety issues, it is the user's responsibility to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.
1 Scope
This standard specifies the determination of fluoride in fertilizers by ion selective electrode.
This standard is applicable to the determination of acid-soluble fluorides (in terms of F) in phosphorus-containing fertilizers.
The detection limit of this method is 2.5μg, the linear range is 0 ~ 20μg/mL.
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.
GB/T 602 Preparation of standard solutions for the determination of impurities in chemical reagents
Preparation of preparations and preparations for use in the test methods for chemical reagents GB/T 603
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 8571 Compound Fertilizer Laboratory Sample Preparation
3 method summary
Fluoride ion selective electrode of lanthanum fluoride single crystal membrane on the fluoride ion selective logarithmic response, fluoride electrode and saturated calomel electrode in the measured
In the test solution, the potential difference can be changed with the change of the activity of fluoride ions in the solution. The change of the potential is in accord with the equation.
E = E0-
2.303RT
F logcF
E is linear with 1ogcF-. 2.303RT/F is the slope of the line (59.16 at 25 ° C).
4 reagents and solutions
The reagents used in this standard, unless otherwise specified, are of analytical grade. Laboratory water should meet the GB/T 6682 in the three water specifications.
The solution used in the analysis was prepared according to GB/T 602, GB/T 603 when no other requirements were indicated.
4.1 hydrochloric acid solution. c (HCl) = 1mol/L.
4.2 hydrochloric acid solution. 1 1 (volume ratio).
4.3 Sodium acetate solution. c (CH3COONa · 3H2O) = 3mol/L
Weigh 204g sodium acetate (CH3COONa · 3H2O), dissolved in about 300mL of water, add 1mol/L acetic acid with a good pH test
Paper to adjust the pH to 7.0, into the 500mL volumetric flask, add water to the mark.
4.4 Sodium citrate solution. c (Na3C6H5O7 · 2H2O) = 0.75mol/L
Weigh 110g of sodium citrate (Na3C6H5O7 · 2H2O), dissolved in about 300mL of water, add perchloric acid (HClO4) 14mL,
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