PDF GB/T 23948-2023 English (GB/T 23948-2009: Older version)
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Inorganic chemicals for industrial use - General method for the determination of water insoluble matter
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| GB/T 23948-2009 | English | 90 |
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Inorganic chemical products method for the determination of water -insoluble matter
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GB/T 23948-2023: PDF in English (GBT 23948-2023) GB/T 23948-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.01
CCS G 10
Replacing GB/T 23948-2009
Inorganic chemicals for industrial use -- General method for
the determination of water insoluble matter
ISSUED ON: NOVEMBER 27, 2023
IMPLEMENTED ON: JUNE 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle ... 5
5 Reagents or materials ... 6
6 Instruments and equipment ... 6
7 Test steps ... 7
8 Test data processing ... 9
Annex A (informative) Commonly used qualitative detection methods for inorganic
chemical products ... 10
Bibliography ... 11
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 23948-2009 "Inorganic chemicals for industrial use --
General method for the determination of water insoluble matter". Compared with GB/T
23948-2009, in addition to structural adjustments and editorial changes, the main
technical changes are as follows:
a) Changed the scope of application (see Chapter 1 of this Edition; Chapter 1 of
Edition 2009);
b) Added the specimen sampling weight (see 7.1 of this Edition);
c) Changed the method for determining whether the glass crucible method and the
Gooch crucible method are clean (see 7.2 and 7.3 of this Edition; 6.1 and 6.2 of
Edition 2009);
d) Added the microporous membrane method (see 7.4 of this Edition);
e) Added the mass constant operation step (see 7.5 of this Edition).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on
Chemical of Standardization Administration of China (SAC/TC 63).
The drafting organizations of this document: Zhejiang Bilifu Testing Technology Co.,
Ltd., Dofluoro New Materials Co., Ltd., Inner Mongolia Murui Energy Materials Co.,
Ltd., Zhejiang Huayou Cobalt Co., Ltd., Qingdao Haiwan Chemical Co., Ltd., Guangxi
Hezhou Kelong Powder Co., Ltd., Ningxia Yingfu Jinhe Technology Co., Ltd., Hubei
Xingfa Chemical Group Co., Ltd., Longbai Group Co., Ltd., SDIC Xinjiang Lop Nur
Potash Co., Ltd., Shandong Xinhua Silica Gel Co., Ltd., Zhejiang Shuizhiyin Testing
Co., Ltd., Institute of Process Engineering, Chinese Academy of Sciences, and CNOOC
Tianjin Chemical Research and Design Institute Co., Ltd.
Main drafters of this document: Gao Xunzhou, Yang Huachun, Fan Yuewei, Xie Baihua,
Wang Yunfeng, Li Qihong, Xie Yongjun, Liu Li, Chen Xiaoli, Wei Hongzhen, Qiu
Xingdong, Zhu Chunlian, Wang Zongyao, Guo Fengxin, Ye Wenhao, Zhang Yan, Lei
Yangui, Huang Huabin, Li Caiyan, Wan Jinzhu, Li Jingfang, Ji Ran, Liu Wangzhi, Li
Xia, Zhao Meijing, Rui Xue, Li Ziluan.
Inorganic chemicals for industrial use -- General method for
the determination of water insoluble matter
1 Scope
This document describes the principles, reagents or materials, instruments and
equipment, test procedures and test data processing of the general method for the
determination of water-insoluble matter in inorganic chemical products.
This document is applicable to the determination of water-insoluble matter in inorganic
chemical products. The glass sand crucible method specified in this document is
applicable to the determination of water-insoluble matter in non-alkaline products. The
microporous membrane filter method (made of polytetrafluoroethylene) is applicable
to the determination of water-insoluble matter in products with a pH value of 2~13 in
aqueous solution. The Gooch crucible method is applicable to the determination of
water-insoluble matter in all products.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
Dissolve the specimen with water. Use appropriate filtering equipment (glass crucible,
Gooch crucible or microporous filter membrane) to filter out the insoluble matter in the
sample. Wash the filter residue with water to completely separate it from the main body
of the sample. After drying, weigh the mass of the insoluble matter with an electronic
balance.
5 Reagents or materials
5.1 Hydrochloric acid solution: 1+1.
5.2 Silver nitrate solution: 17 g/L.
5.3 Water: Unless otherwise specified, water shall comply with the grade three water
specified in Table 1 of GB/T 6682-2008.
5.4 Acid-washed asbestos: Take an appropriate amount of acid-washed asbestos and
soak it in hydrochloric acid solution (1+3). Boil for 20 min. Filter with a Buchner funnel
and wash with water until neutral. Soak with sodium hydroxide solution (50 g/L) and
boil for 20 min. Filter with a Buchner funnel and wash with water until nearly neutral
(check with a wide range pH test paper). Mix with water to make a thin paste and set
aside.
6 Instruments and equipment
6.1 Glass crucible: the filter plate pore size is 5 μm~15 μm, or other pore sizes can be
selected according to product properties.
6.2 Gooch crucible: the capacity is 30 mL, or other capacity can be selected according
to the properties of the product.
6.3 Microporous filter membrane: the pore size is 0.45 μm; the material is
polytetrafluoroethylene (PTFE).
6.4 Vacuum filtration device.
6.5 Membrane filtration device: the capacity is 1000 mL, see Figure 1.
7.2.2 Test
Select a glass crucible with appropriate pore size according to the product properties.
Place the cleaned glass crucible in an electric constant temperature drying oven (6.6).
Dry at 105℃±2℃ until the mass is constant.
Weigh a certain amount of specimen. Add appropriate amount of water to completely
dissolve the specimen (hot water can be used if necessary). Place the glass crucible that
has been dried to a constant mass on the suction bottle of the vacuum suction filter
device (6.4). Filter the specimen solution. Wash the residue with hot water at an
appropriate temperature until the main body of the specimen adsorbed on the residue is
clean (the product standard can adopt the method of testing the pH value of the filtrate
or qualitative testing to verify whether the main body is clean according to the situation.
Commonly used qualitative testing methods are shown in Annex A). Place the glass
crucible and the residue in an electric constant temperature drying oven (6.6). Dry at
105℃±2℃ until the mass is constant.
7.3 Gooch crucible method
7.3.1 Laying of Gooch crucible filter layer
Place the Gooch crucible (6.2) on the suction bottle of the vacuum suction filtration
device. Evenly spread a layer of acid-washed asbestos (5.4) on the upper and lower
sides of the crucible sieve plate. Press it tightly with a flat glass rod while filtering. The
thickness of each layer is about 3 mm. Wash with water at 60℃~80℃ until there is no
asbestos in the filtrate. Remove the crucible and place it in an electric constant
temperature drying oven (6.6). Dry at 105℃±2℃ until the mass is constant.
7.3.2 Test
Weigh a certain amount of specimen and place it in a 500 mL beaker. Add an appropriate
amount of water to completely dissolve the specimen (hot water can be used if
necessary). Place the Gooch crucible (6.2) that has been dried to a constant mass on the
suction bottle of the vacuum suction filter device (6.4). Filter the specimen solution.
Wash the residue with hot water at an appropriate temperature until the main body of
the specimen adsorbed on the residue is clean (the product standard can use the method
of testing the pH value of the filtrate or qualitative testing to verify whether the main
body is clean according to the situation. Commonly used qualitative testing methods
are shown in Annex A). Place the Gooch crucible (6.2) and the residue in an electric
constant temperature drying oven (6.6). Dry at 105℃±2℃ until the mass is constant.
7.4 Microporous membrane method
Place the microporous filter membrane (6.3) in a weighing bottle. Place it in an electric
constant temperature drying oven (6.6). Dry it at 105℃±2℃ until the mass is constant.
Assemble the microporous filter membrane (6.3) and the membrane filtration device
(6.5) together and set aside.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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