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GB/T 6284-2006 English PDF (GB/T 6284-1986)

GB/T 6284-2006_English: PDF (GB/T6284-2006)
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GB/T 6284-2006English115 Add to Cart 0--9 seconds. Auto-delivery Chemical products for industrial use -- General method for determination of water content -- The loss of mass on drying method Valid GB/T 6284-2006
GB/T 6284-1986English199 Add to Cart 2 days [Need to translate] Chemical products for industrial use--General method for determination of water content--Gravimetric method Obsolete GB/T 6284-1986


BASIC DATA
Standard ID GB/T 6284-2006 (GB/T6284-2006)
Description (Translated English) Chemical products for industrial use. General method for determination of water content. The loss of mass on drying method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G10
Classification of International Standard 71.040.40
Word Count Estimation 6,682
Date of Issue 2006-12-29
Date of Implementation 2007-06-01
Older Standard (superseded by this standard) GB/T 6284-1986
Adopted Standard JIS K0068-2001, MOD
Drafting Organization Tianjin Entry-Exit Inspection and Quarantine Bureau
Administrative Organization National Standardization Technical Committee Chemistry Inorganic Chemicals Branch
Regulation (derived from) China National Standard Approval Announcement 2006 No.13 (Total No.100)
Proposing organization China Petroleum and Chemical Industry Association
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard provides a common method of solid chemical products moisture determination-Loss on drying method. This method is applicable to the determination of heat stable solid chemical products in the water.

BASIC DATA
Standard ID GB/T 6284-1986 (GB/T6284-1986)
Description (Translated English) Chemical products for industrial use--General method for determination of water content--Gravimetric method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G04
Classification of International Standard 71.040.40
Word Count Estimation 4,422
Date of Issue 1986/4/18
Date of Implementation 1987/4/1
Adopted Standard �������� 14870-1977, NEQ
Regulation (derived from) China Announcement of Newly Approved National Standards No. 13, 2006 (No. 100 overall)
Proposing organization Ministry of Chemical Industry of the People Republic of China
Issuing agency(ies) National Bureau of Standards


GB/T 6284-2006 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.040.40 G 10 Replacing GB/T 6284-1986 Chemical products for industrial use - General method for determination of water content - The loss of mass on drying method ISSUED ON: DECEMBER 29, 2006 IMPLEMENTED ON: JUNE 01, 2007 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC; Standardization Administration of PRC. Table of Contents Foreword ... 3  1 Scope ... 5  2 Terms and definitions ... 5  3 Test method ... 6  Appendix A (Informative) Structural differences between this standard and the Japanese standard ... 8  Chemical products for industrial use - General method for determination of water content - The loss of mass on drying method 1 Scope This standard specifies a general method for the determination of moisture in solid chemical products - The loss of mass on drying method. This method is suitable for the determination of moisture in solid chemical products, which are stable in heating. 2 Terms and definitions The following terms and definitions apply to this standard. 2.1 The loss of mass on drying method A method of reducing the mass of solid substances, by completely volatilizing the volatile substances, including water, from solid products, through heating. Note: When using the loss of mass on drying method, to determine the true moisture in the product, it shall meet the following three conditions: ① All that is volatile is water; ② There is no chemical change, OR although there is a chemical change, it is not accompanied by a mass change; ③ Moisture can be completely removed. In fact, it is very difficult to fully satisfy the above three conditions, in most conditions. Therefore, when the loss of mass on drying method is used to determine moisture, volatile substances, other than moisture OR volatile substances as generated during the chemical change in the heating process, are also considered as moisture. 2.2 Heating to stabilization During the heating process of the sample, volatile substances other than moisture OR volatile substances as generated by chemical changes, are within the allowable range, that is to say, the volatile substances, which are produced, do not affect the accuracy of the moisture determination results. 2.3 Constant weight After repeated drying, until the mass difference between the two weighed results is greater than 0.0003 g, it is regarded as constant weight. 3 Test method 3.1 Summary of method Heat and dry the sample at (105 ± 2) °C, to a constant weight. Calculate the reduced mass of the sample, after drying. 3.2 Instrument and equipment 3.2.1 Weighing bottle: Flat-shaped with lid; the capacity is that, after adding the specimen, the thickness of the specimen is less than 5 mm; 3.2.2 Electric heating constant temperature drying oven: The temperature can be controlled at 105 °C, at an accuracy of ±1 °C; 3.2.3 Desiccator: It contains appropriate desiccant (such as color-changing silica gel, phosphorus pentoxide, etc.); 3.2.4 Balance: Photoelectric analytical balance or electronic balance, which has a division value of 0.1 mg. 3.3 Specimen processing If the specimen is a block or large crystal, it shall be crushed to a particle size of less than 2 mm AND mixed thoroughly. During the operation, avoid the loss of moisture in the specimen or the absorption of moisture from the air. 3.4 Analytical procedures Adjust the electric heating thermostat to (105 ± 2) °C. Then put the weighing bottle in the electric heating thermostat, to dry it. Take it out. Cool it in the dryer [cooling time is generally (20 ~ 40) min; the cooling time of repeated operation must be the same]. Weigh it, accurate to 0.1 mg. Repeat the operation to constant weight. ......

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