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Analysis in accordance with the DIN EN ISO 17895 test method (determination of the in-can VOC content in water-soluble emulsion paints）
Posted Date:2025/7/1 1
8.3 Analysis
8.3.1 General
Place the vials prepared as in 8.2.3 and 8.2.4 in the headspace injector.
8.3.2 Headspace injector
The following conditions are applied for analysis using aheadscape injector:
Controlled sample temperature: 150 ℃.
Controlled transfer line and dispensing valve temperatures: 160 ℃.
Temperature hold time: 4 min.
8.3.3 Gas chromatograph
Adjust the gas-chromatographic conditions to the design of the apparatus. Two examples of gas-chromatographic conditions are given in Tables 1 and 2.
Table 1-Example 1: headspace injector with sample loop
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Capillary column:
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Length
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30 m
|
|
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internal diameter
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0.32 mm
|
|
|
coating
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95% dimethylsilicone and 5% phenylsilicone
|
|
|
film thickness of coating
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about 1 μm
|
|
|
|
|
|
Temperatures:
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Injector temperature:
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250℃
|
|
|
Oven:
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Initial temperature: 100 ℃
|
|
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Heating rate:
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10 ℃/min
|
|
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Final temperature:
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280℃
|
|
|
Detector temperature:
|
300℃
|
|
Carrier gas
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flow rate
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1.8 ml/min
|
|
Split
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Split ratio:
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1:10
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Table 2 - Example 2: headspace injector with equal-pressure application method
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Capillary column:
|
Length
|
30 m
|
|
|
internal diameter
|
0.32 mm
|
|
|
coating
|
95 % dimethylsilicone and 5 % phenylsilicone
|
|
|
film thickness of coating
|
about 1 μm
|
|
|
film thickness of coating
|
about 1 μm
|
|
|
restrictor capillary inserted between column and detector
|
methyl-deactivated 1.5 m x 0,15 mm
|
|
|
|
|
|
Temperatures:
|
Injector temperature:
|
200℃
|
|
|
Oven:
|
Initial temperature: 100 ℃
|
|
|
Heating rate:
|
10 ℃/min
|
|
|
Final temperature:
|
280℃
|
|
|
Detector temperature:
|
300℃
|
|
|
|
|
|
Carrier gas
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pressure of headspace PHS
|
160 kPa
|
|
|
pressure of GC PGC
|
125 kPa
|
|
|
flow rate ф:
|
1.8 ml/min
|
|
Split:
|
Split flow
|
1,8 ml/min
|
8.3.4 Determination of integration end point
Determine the retention time of the marker compound by a separate gas chromatogram analysis. It defines the integration end point for the VOC determination.