GB/T 30647-2014 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 30647-2014 | English | 100 |
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Determination of harmful elements total content of coatings
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GB/T 30647-2014: Determination of harmful elements total content of coatings---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/GBT30647-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Determination of harmful elements total content of
coatings
Issued on. DECEMBER 31, 2014
Implemented on. JULY 01, 2015
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 Principle... 4
4 Reagents and materials... 4
5 Equipment... 5
6 Test procedures... 6
7 Calculation of results... 9
8 Precision... 9
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Petroleum and Chemical Industry
Federation.
This standard shall be under the jurisdiction of the National Technical
Committee for Standardization of Coatings and Pigments (SAC/TC 5).
Drafting organizations of this standard. CNOOC Changzhou Coating Chemical
Research Institute Co., Ltd., Guangzhou Synthetic Materials Research Institute
Co., Ltd., Zhanchen Coatings Group Co., Ltd., Beijing Bihaizhou Corrosion
Protection Industry Co., Ltd., Shenzhen Guangtian Decoration Group Co., Ltd.,
Metallurgical Industry Jianxin Materials Co., Ltd., Marine Chemical Research
Institute Co., Ltd., Chongqing Sanxia Paint Co., Ltd.
The main drafters of this standard. Zhang Yonggang, Huang Ning, Tan
Hongyang, Yang Qi, Li Yixuan, Guo Xiaoyan, Shi Youyou, Li Jing, Xu
Zhongcheng.
Determination of harmful elements total content of
coatings
1 Scope
This standard specifies the test method for the total content of harmful elements
in coatings.
This standard applies to the determination of the total content of various harmful
elements in coatings, including but not limited to the exemplified elements, such
as lead, cadmium, mercury, chromium, arsenic, etc.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
GB/T 6682-2008 Water for analytical laboratory use - Specification and test
methods
3 Principle
After the coating film is dried, suitable methods such as dry ashing method, wet
acid digestion method or microwave digestion method are used to remove all
organic substances;
4 Reagents and materials
Only the reagents identified as analytically pure are used in the analysis test.
The water used meets the requirements of grade 3 water in GB/T 6682-2008.
4.1 Nitric acid. about 65% (mass fraction). Nitric acid that has turned yellow
shall not be used.
4.2 Nitric acid solution. 1.1 (volume ratio).
5 Equipment
General laboratory equipment and some of the following equipment.
5.1 Appropriate analytical instruments (such as atomic absorption spectrometer,
inductively coupled plasma emission spectrometer, inductively coupled plasma
mass spectrometer, etc.).
5.6 Microwave digestion apparatus. It can be closed for digestion and has a
temperature control device.
5.7 Analytical balance. The accuracy is 0.1 mg.
5.8 Crucible. 50 mL.
5.9 Volumetric flask. 50 mL, 100 mL, etc.
5.10 Beaker. 50 mL, 100 mL, etc.
5.11 Pipette. 1 mL, 2 mL, 5 mL, 10 mL, etc.
5.12 Glass plate or Teflon plate. The size is 150 mm × 100 mm.
6 Test procedures
6.1 Preparation of coating film
Stir the sample to be tested evenly. Prepare a mixed sample according to the
product's stated ratio (no need to add a diluent). After mixing well, prepare a
coating film of appropriate thickness on a glass plate or Teflon plate (see 5.12).
6.2 Preparation of test solution
6.2.1 General
6.2.1.1 This standard provides the following three test solution’s preparation
methods. The laboratory may choose one of them according to the conditions.
6.2.2 Dry ashing method
Weigh about 2 g (accurate to 0.1 mg) of the crushed sample. Put it into the
crucible (see 5.8). Place the crucible on a hot plate (see 5.5) in a fume hood.
Gradually increase the temperature of the hot plate (not exceeding 475 °C),
until the sample is digested into a coke; meanwhile the volatile digestion
products have been fully discharged, leaving only dried residue. Then put the
crucible in a muffle furnace at (475 ± 25) °C and keep it warm until it is
completely ashed.
6.2.3 Wet acid digestion
Weigh about 0.5 g ~ 1 g of the crushed sample (accurate to 0.1 mg). Place it in
a 50 mL beaker (see 5.10). Add 7 mL of nitric acid (see 4.1). Cover the watch
glass. Heat it on a hot plate (see 5.5) to keep the solution slightly boiling for
about 5 ~ 15 min. Continue to heat until white smoke is generated, but it cannot
be dried. Remove the beaker from the hot plate.
6.2.4 Microwave digestion
Weigh about 0.1 g ~ 0.2 g (accurate to 0.1 mg) of the crushed sample and place
it in a microwave digestion tank. Add 6 mL of nitric acid (see 4.1) and 1 mL ~ 2
mL of hydrogen peroxide (see 4.4). After the reaction is stable, close the
digestion tank and place it in a microwave digestion instrument (see 5.6). Set
appropriate digestion conditions for digestion.
6.3 Testing
6.3.1 General
For the test solution prepared in accordance with 6.2, use appropriate analytical
instrument (see 5.1) to determine the content of the tested elements.
When using any kind of analytical instrument for measurement, the analyst shall
operate it in accordance with the instrument manual or operation manual;
indicate the analytical instrument used in the test report.
7 Calculation of results
Calculate the content of the test element in the sample according to formula (1).
8 Precision
8.1 Repeatability
The relative deviation of the two test results of the same operator shall be less
than 10%.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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