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GB/T 24890-2010: Determination of chloride content for compound fertilizers
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 24890-2010 | English | 149 |
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Determination of chloride content for compound fertilizers
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GB/T 24890-2010
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Basic data | Standard ID | GB/T 24890-2010 (GB/T24890-2010) | | Description (Translated English) | Determination of chloride content for compound fertilizers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G20 | | Classification of International Standard | 65.080 | | Word Count Estimation | 5,536 | | Date of Issue | 2010-06-30 | | Date of Implementation | 2011-01-01 | | Quoted Standard | GB/T 8571; HG/T 2843 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.2 (Total No.157) | | 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 fertilizer (compound fertilizer) in chloride ion content. This standard applies to fertilizer (compound fertilizer) determination of chloride ion content. | GB/T 24890-2010: Determination of chloride content for compound fertilizers---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.
Determination of chloride content for compound fertilizers
ICS 65.080
G20
National Standards of People's Republic of China
Determination of chlorine ion content in compound fertilizer
Issued on. 2010-06-30
2011-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is one of compound fertilizer series of standard test methods, which are listed below national standards.
--- GB/T 8571-2008 "compound fertilizer laboratory sample preparation";
--- GB/T 8572-2010 "After distillation of total nitrogen content for compound fertilizers - Titrimetric method";
--- GB/T 8573-2010 "Determination of phosphorus content in compound fertilizer quinoline phosphomolybdate gravimetric method";
--- GB/T 8574-2010 "Determination of potassium content for compound fertilizers - Potassium tetraphenylborate gravimetric method";
--- GB/T 8576-2010 "free water for compound fertilizers - Determination vacuum oven method";
--- GB/T 8577-2010 "free water for compound fertilizers - Determination Karl Fischer method";
--- GB/T 24891-2010 "compound fertilizer particle size determination."
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee and soil conditioners Fertilizers (SAC/TC105) centralized.
This standard was drafted. National Fertilizer Quality Supervision and Inspection Center (Shanghai), Heilongjiang Province, cereals compound fertilizers Limited.
The main drafters of this standard. Li Chongming, Zhu Tao, Su Gang.
Determination of chlorine ion content in compound fertilizer
1 Scope
This standard specifies the determination of compound fertilizers (compound fertilizer) Chlorine ion content.
This standard applies to compound fertilizers (compound fertilizer) Determination of chloride ion content.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Preparation of GB/T 8571 compound fertilizer laboratory samples
HG/T 2843 fertilizer products for chemical analysis commonly used standard titration solution, standard solution, reagent solution and indicator solution
Principle 3
In the acidic sample solution, adding an excess of silver nitrate solution, converted into the chlorine ion precipitation of silver chloride, dibutyl phthalate
Ester wrapped precipitate with ammonium ferric sulfate as indicator, titrate with ammonium thiocyanate standard solution of silver nitrate remaining.
4 Reagents and materials
This method is used in the reagent solution and water, in the specifications and method of preparation is not specified, it shall comply with the provisions of HG/T 2843's.
4.1 dibutyl phthalate;
4.2 nitric acid solution. 11;
4.3 silver nitrate solution [c (AgNO3) = 0.05mol/L]. Weigh 8.7g of silver nitrate, dissolved in water and diluted to 1000mL, storage
In a brown bottle;
4.4 Chloride standard solution (1mg/mL). Weigh accurately 1.6487g by 270 ℃ ~ 300 ℃ drying to constant reference mass chlorination
Sodium in a beaker, dissolved in water and transferred to 1000mL volumetric flask, dilute to volume, mix and store in a plastic bottle. This solution containing 1mL
1mg chloride (of Cl-);
4.5 ferric ammonium sulfate indicator solution (80g/L). dissolve 8.0g of ammonium ferric sulfate in 75mL of water, filtered, add a few drops of sulfuric acid, so that the disappearance of brown, thin
Diluted to 100mL;
4.6 ammonium thiocyanate standard titration solution [c (NH4SCN) = 0.05mol/L]. weigh 3.8g ammonium thiocyanate is dissolved in water and diluted to
1000mL.
Calibration methods are as follows. Imbibe 25.0mL standard solution of chloride in 250mL conical flask, 5mL nitric acid solution and
25.0mL silver nitrate solution, shaken to precipitate stratification, dibutyl phthalate was added 5mL, shaking moment. Water was added, the solution overall
Area of \u200b\u200babout 100mL, was added 2mL ferric ammonium sulfate indicator solution, titration with ammonium thiocyanate standard solution of silver nitrate titration remaining, to appear light orange
Red or pale brick red so far. At the same time a blank test.
Ammonium thiocyanate standard titration solution concentration c (mol/L) according to equation (1).
c = m10.03545 × (V0-V1)
(1)
Where.
Value V0 --- blank test (25.0mL silver nitrate solution) volume of ammonium thiocyanate standard titration solution consumed, in units of milli
L (mL of);
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