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GB/T 8574-2010 English PDF (GBT8574-2010)

GB/T 8574-2010 English PDF (GBT8574-2010)

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GB/T 8574-2010: Determination of potassium content for compound fertilizers -- Potassium tetraphenylborate gravimetric method

This Standard specifies the determination of potassium content for compound fertilizers. This Standard applies to the determination of potassium content for compound fertilizers.
GB/T 8574-2010
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 65.080
G 20
Replacing GB/T 8574-2002
Determination of potassium content for
compound fertilizers - Potassium
tetraphenylborate gravimetric method
ISSUED ON. SEPTEMBER 26, 2010
IMPLEMENTED ON. MARCH 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Principle ... 5
4 Reagents and materials ... 6
5 Instruments ... 6
6 Preparation of sample solution... 6
7 Analysis steps ... 6
8 Expression of analysis results ... 8
Foreword
This Standard is one of the series of standards for compound fertilizer test methods. These series of national standards are listed below.
- GB/T 8571-2008 ?€?Preparation of laboratory samples for compound fertilizers?€?; - GB/T 8572-2010 ?€?Determination of total nitrogen content for compound fertilizers titrimetric method after distillation?€?;
- GB/T 8573-2010 ?€?Determination of available phosphorus content for compound fertilizers?€?;
- GB/T 8574-2010 ?€?Determination of potassium content for compound fertilizers - Potassium tetraphenylborate gravimetric method?€?;
- GB/T 8576-2010 ?€?Determination of free water for compound fertilizers - Vacuum oven method?€?;
- GB/T 8577-2010 ?€?Determination of free water for compound fertilizers - Karl Fischer method?€?;
- GB/T 24890-2010 ?€?Determination of chloride content for compound fertilizers?€?; - GB/T 24891-2010 ?€?Determination of particle size for compound fertilizers?€?. The preparation of sample solution in this Standard references ISO 5317.1983 ?€?Fertilizers - Determination of water-soluble potassium content - Preparation of the test solution?€?.
This Standard replaces GB/T 8574-2002 ?€?Determination of potassium content for compound fertilizers - Potassium tetraphenylborate gravimetric method?€?. Main difference between this edition and the previous edition is. the standard format is rewritten.
This Standard is proposed by China Petroleum and Chemical Industry Association. This Standard is under the jurisdiction of National Technical Committee on Fertilizers and Soil Conditioners of Standardization Administration of China (SAC/TC 105). Responsible drafting organizations of this Standard. National Center for Quality Supervision and Testing of Fertilizers (Shanghai), Wuxi Pacific Fertilizer Co., Ltd. Main drafters of this Standard. Zhang Minghong, Zhou Yongming, Liu Gang, Liu Yun, Yuan Yun.
Determination of potassium content for compound
fertilizers - Potassium tetraphenylborate gravimetric
method
1 Scope
This Standard specifies the determination of potassium content for compound fertilizers.
This Standard applies to the determination of potassium content for compound fertilizers.
2 Normative references
The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB/T 8571 Preparation of laboratory samples for compound fertilizers
HG/T 2843 Chemical fertilizer products - Standard volumetric standard reagent and indicator solutions for chemical analysis
3 Principle
In weak alkaline solution, sodium tetraphenylborate solution reacts with potassium ions in the sample solution and generates potassium tetraphenylborate precipitates; FILTRATE the precipitates, DRY and WEIGH. If the sample contains cyanamide or organic matters, it may first add bromine water and activated carbon to treat. To prevent cationic interference, an appropriate amount of ethylenediaminetetraacetic acid disodium salt (EDTA) can be added in advance to complex the cation with disodium ethylenediaminetetraacetate.

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