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GB/T 30647-2014 PDF in English


GB/T 30647-2014 (GB/T30647-2014, GBT 30647-2014, GBT30647-2014)
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GB/T 30647-2014: PDF in English (GBT 30647-2014)

GB/T 30647-2014
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 
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; after dissolving, filtering, volume-adjusting treatment, a
suitable analytical instrument [such as atomic absorption spectrometer (AAS),
inductively coupled plasma emission spectrometer (ICP-OES), inductively
coupled plasma mass spectrometer (ICP-MS), etc.] are used to determine the
content of test elements in the test solution after treatment.
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
washed and dried by water.
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).
Under the drying conditions specified in the product manual, after the coating
film is completely dry [if the self-drying paint is dried, the temperature must not
exceed (60 ± 2) °C], remove the coating film. Use a crushing equipment (see
5.2) to crush it, to make the size of the coating film be less than 5 mm.
Note 1: For the coating film (such as elastic and plastic coating film) that cannot
be crushed by the crusher, use a clean scissors to cut the coating film so that
the size of the coating film is less than 5 mm.
Note 2: For powder samples, the test solution is directly prepared.
Note 3: For samples that cannot form a film, the test solution is prepared directly
after drying.
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.
6.2.1.2 When the following methods are used to digest samples, it may also
determine appropriate digestion conditions according to the actual conditions
of the samples, to ensure that all organic compounds in the sample are
removed and all elements to be tested are dissolved. If there are residues in
the processed samples, the residues shall be detected by appropriate
measuring methods [such as X-ray fluorescence spectrometer (XRF)], to
ensure that no tested element exists. Otherwise, it shall change the digestion
conditions to completely dissolve the test elements.
6.2.1.3 When determining the volatile and harmful elements (such as mercury,
arsenic, etc.), it shall not use the dry ashing method or the wet acid digestion
method; it shall select the microwave digestion method.
6.2.1.4 It shall prepare two sets of test solutions at the same time for testing.
6.2.2 Dry ashing method
filter membrane (see 5.13) to filter the digestion solution and transfer it to a 50
mL volumetric flask (see 5.9). Use water to rinse the inner wall and inner lid of
the digestion tank. Collect the washing solution in the same volumetric flask.
Meanwhile use water to rinse the filter membrane. Collect the resulting solution
in the same volumetric flask. Use water to dilute it to the mark. Meanwhile carry
out the reagent blank test.
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.
6.3.2 Preparation of standard working solution
Select a suitable volumetric flask (see 5.9) and a pipette (see 5.11). Use nitric
acid solution (see 4.3) to dilute the standard stock solution of the tested element
(see 4.5) in stages, to prepare a series of standard working solutions for
instrument testing (the concentration range of the standard working solution can
be determined according to the instrument used and the condition of the test
sample, so that its concentration is equivalent to the concentration in the sample
solution).
6.3.3 Establishment of calibration curve
Adjust the instrument and lead the standard working solution prepared in
accordance with 6.3.2 into the test instrument in turn. Various types of
instruments will establish a calibration curve based on the relationship between
their characteristic response values and their corresponding concentrations.
The calibration curve shall include at least one blank sample and five standard
working solutions. The correlation coefficient of the linear regression curve shall
be ≥ 0.995; otherwise, it shall make a new calibration curve again.
6.3.4 Determination of tested element content in test solution
Lead the test solution prepared according to 6.2 into the test instrument. Various
types of instruments will automatically give the concentration value of the
element to be tested in the test solution according to the calibration curve and
the characteristic response value of the test solution. If the concentration of the
element to be tested in the test solution exceeds the highest point of the
calibration curve, the test solution shall be appropriately diluted by a nitric acid
solution (see 4.3) before testing.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.