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GB/T 5474-2016: Plastics -- Phenol formaldehyde moulding -- Determination of free ammonia and ammonium compounds -- Colorimetric comparison method
Status: Valid GB/T 5474: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 5474-2016 | English | 114 |
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Plastics -- Phenol formaldehyde moulding -- Determination of free ammonia and ammonium compounds -- Colorimetric comparison method
| Valid |
GB/T 5474-2016
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| GB/T 5474-1985 | English | 159 |
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Phenol-formaldehyde mouldings. Determination of free ammonia and ammonium compounds. Colorimetric comparison method
| Obsolete |
GB/T 5474-1985
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PDF similar to GB/T 5474-2016
Basic data | Standard ID | GB/T 5474-2016 (GB/T5474-2016) | | Description (Translated English) | Plastics -- Phenol formaldehyde moulding -- Determination of free ammonia and ammonium compounds -- Colorimetric comparison method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G31 | | Classification of International Standard | 83.080.01 | | Word Count Estimation | 6,651 | | Date of Issue | 2016-06-14 | | Date of Implementation | 2017-01-01 | | Older Standard (superseded by this standard) | GB/T 5474-1985 | | Quoted Standard | ISO 565; ISO 648 | | Adopted Standard | ISO 120-1977, IDT | | Regulation (derived from) | National Standard Announcement No. 8 of 2016 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies a colorimetric method for the semi-quantitative determination of ammonia content in phenolic moldings. It is particularly important to measure the amount of ammonia in the molded article when it is necessary to consider the corrosion of the metal insert or the contamination of the food due to contact with the molded article. | GB/T 5474-2016: Plastics -- Phenol formaldehyde moulding -- Determination of free ammonia and ammonium compounds -- Colorimetric comparison method
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Plastics.Phenol formaldehyde mouldings.Determination of free ammonia and ammonium compounds.Colorimetric comparison method
ICS 83.080.01
G31
National Standards of People's Republic of China
Replacing GB/T 5474-1985
Plastic Phenolic Molding Products Free Ammonia
And the determination of ammonium compounds by colorimetric method
(ISO 120. 1977, IDT)
2016-06-14 release
2017-01-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5474-1985 "Determination of free ammonia and ammonium compounds in phenolic molded products by colorimetric"
GB/T 5474-1985 compared to the main technical changes are as follows.
--- standard name changed to "plastic phenolic molded products free ammonia and ammonium compounds determination of colorimetric method";
--- Added "preface";
--- removed the standard text "This standard is equivalent to the international standard ISO 120. 1977" plastic phenolic molding material free ammonia
And the determination of ammonium compounds by colorimetric method "(see 1985 edition);
- the "use of the note" was deleted (see version 4.2 of 1985);
--- Added "7.1 samples" (see 7.1, 1985, Chapter 6);
--- to make the appropriate changes to the formula to meet the technical conditions of our country, the specific changes are as follows.
Use the formula "wa =
m × D
"Instead of the formula" m × D
(See Chapter 8, Chapter 7 of 1985);
--- Remove the standard additional instructions.
This standard uses the translation method equivalent to ISO 120. 1977 "Determination of free ammonia and ammonium compounds in plastic phenolic molded products
Color method ".
And the normative reference in this standard international documents are consistent with the relationship between China's documents are as follows.
GB/T 6005-2008 Basic dimensions of test sieve wire braid, perforated plate and electroformed sheet sieve
(ISO 565..1990, MOD)
GB/T 12808-1991 Laboratory glass instruments Single-line pipette (eqvISO 648..1997)
This standard is proposed by the China Petroleum and Chemical Industry Association.
This standard by the National Plastics Standardization Technical Committee Thermosetting Plastics Subcommittee (SAC/TC15/SC11) centralized.
The drafting of this standard. Shanghai Eurasian Synthetic Materials Co., Ltd., in the blue dawn Chemical Research and Design Institute Co., Ltd., the national synthetic resin
Quality Supervision and Inspection Center, Changshu Southeast Plastic Co., Ltd., Shaxian Hongsheng Plastic Co., Ltd., Shandong Shengquan Chemical Co., Ltd.
The main drafters of this standard. Chen Ziling, Liu Yong, Zhao Ping, Qi Lihua, Luo Jianfeng, Wei Ying, Wang Yonggui.
This standard was first published in October 1985 and this is the first revision.
Plastic Phenolic Molding Products Free Ammonia
And the determination of ammonium compounds by colorimetric method
1 Scope
This standard specifies the semi-quantitative determination of phenolic molded products in the ammonia content of the colorimetric method.
Note. This standard does not apply to the determination of the absolute amount of ammonia.
When it is necessary to consider the corrosion or food contamination of the metal insert due to contact with the molded article, the content of ammonia in the molded article is measured
Is important.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
ISO 565 test sieve wire mesh, perforated plate and electroformed sheet sieve basic dimensions (Testsieves-Woven
metalwireclothandpertoratedplate-Nominalsizesofapertures)
ISO 648 laboratory glass instrument single standard line pipette (Laboratoryglassware-One-markpipettes)
3 principle
The free ammonia was extracted from the powder sample with hot water. The water extract is distilled in the presence of potassium permanganate and sodium hydroxide solution. Distillate with
Nessler reagents and color development, the color solution and a set of standard solution one by one color.
4 reagent
In the analysis only use the recognized ammonia-free chemical pure reagent, ammonia-free distilled water or the same purity of water.
4.1 Potassium permanganate.
4.2 Sodium hydroxide. A solution with a mass fraction of 2%.
4.3 Comparison standard stock solution. 10 mg ammonia per liter.
Dissolve 31.5 mg of ammonium chloride in 1000 mL of water.
4.4 Ness's reagent.
5 instruments
General laboratory instruments and the following instruments.
5.1 Equipment for making molded products into powder.
5.2 Test sieve. Sieve size 250μm, in line with ISO 565 requirements.
5.3 balance. the amount of 0.01g.
5.4 with a plug mouth glass flask. capacity 250mL.
5.5 Distillation Unit. Milled flask. capacity 250mL, splash ball and straight condenser.
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