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GB/T 8576-2010 English PDF

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GB/T 8576-2010: Determination of free water for compound fertilizers -- Vacuum oven method
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GB/T 8576: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 8576-201070 Add to Cart Auto, 9 seconds. Determination of free water for compound fertilizers -- Vacuum oven method Valid
GB/T 8576-2002199 Add to Cart 2 days Determination of free water for compound fertilizers -- Vacuum oven method Obsolete
GB/T 8576-1988199 Add to Cart 2 days Determination of free water for compound fertilizers--Vacuum oven method Obsolete

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GB/T 8576-2010: Determination of free water for compound fertilizers -- Vacuum oven method

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8576-2010
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.080 G 20 GB/T 8576-2010 Replacing GB/T 8576-2002 Determination of Free Water for Compound Fertilizers – Vacuum Oven Method Issued on. SEPTEMBER 26, 2010 Implemented on. MARCH 1, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; 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

Foreword

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 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. 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 work. 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 Yun. 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;

4 Procedures

Do the parallel determination against two pieces of testing materials. Prepare the laboratory sample as per the provisions of GB/T 8571.

5 Expression of Analytical Results

5.1 Calculation of analytical results The content of free water w, expressed by mass fraction (%), is calculated by Formula (1). 5.2 Allowable tolerance If the mass fraction of free water w≤2.0%, then the absolute difference of the parallel determination results shall be≤0.20%; ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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