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GB/T 8576-2010 PDF in English

GB/T 8576-2010 (GB/T8576-2010, GBT 8576-2010, GBT8576-2010)
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GB/T 8576-2010: PDF in English (GBT 8576-2010)

GB/T 8576-2010
ICS 65.080
G 20
Replacing GB/T 8576-2002
Determination of Free Water for
Compound Fertilizers – Vacuum Oven Method
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Apparatus ... 4
4 Procedures ... 4
5 Expression of Analytical Results ... 5
This Standard is one of the series standards for the test methods of compound
fertilizers, these series of national standards are listed as follows.
-- 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
-- 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.
This Standard replaces GB/T 8576-2002 Determination of Free Water for Compound
Fertilizers—Vacuum Oven Method.
The major differences between this Standard and previous editions include. the format
of the standard has been re-written according to the relevant rules for standardization
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Fertilizers and Soil Conditioners (SAC/TC 105).
Drafting organizations of this Standard. National Center for Quality Supervision and
Testing of Chemical Fertilizer (Shanghai), and Wuxi Taipingyang Chemical Fertilizer
Co., Ltd..
Chief drafting staffs of this Standard. Liu Yun, Zhang Minghong, Zhu Yiliang, and Yuan
This Standard was first-time published in 1988, and first-time amended in 2002.
Determination of Free Water for
Compound Fertilizers – Vacuum Oven Method
1 Scope
This Standard specifies the vacuum oven method for determination of free water for
the compound fertilizers.
This Standard is not applicable to the compound fertilizers generating non-moisture
volatile substances during the drying process.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 8571 Preparation of Laboratory Samples for Compound Fertilizers
3 Apparatus
3.1 The common laboratory apparatus;
3.2 Thermostatic vacuum oven (vacuum oven). temperature can be controlled at
50°C±2°C; while the vacuum degree can be controlled at 6.4×104 Pa ~7.1×104 Pa;
3.3 Weighing bottle with group stopper. diameter 50mm; height 30mm.
4 Procedures
Do the parallel determination against two pieces of testing materials.
Prepare the laboratory sample as per the provisions of GB/T 8571.
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.