Tetraethylene for industrial use (2)

4 Test method

The reagents and water used in the test method, unless other requirements are specified, refer to the analytical reagents and the tertiary water specified in GB/T6682

The standard solutions, preparations and products used in the test methods are prepared in accordance with GB/T601 and GB/T603 unless other requirements are specified

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According to the provisions of GB/T3143

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Carry out according to the regulations in 2.

The density measured by a densitometer between 10°C and 35°C is converted to the density at 20°C with K=0.

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Use gas chromatography to separate the components in the sample under selected working conditions, detect with a thermal conductivity detector, and calculate the purity of tetrachloroethylene with the calibration area normalization method

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1 Gas chromatograph: equipped with a thermal conductivity detector, its sensitivity and stability should meet the requirements of GB/T9722
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2 Chromatographic column and typical working conditions: The recommended chromatographic columns and typical working conditions of this standard are shown in Table 2.
The typical chromatograms of tetrachloroethylene at a column temperature of 90℃ and a column temperature of 110℃ are shown in Figure 1 and Figure 2, correspondingly The retention time tR and relative retention value r of each main component are shown in Table 3 and Table 4, and the relative correction factor of each component on the thermal conductivity cell detector is shown in Table 5
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Chromatographic columns and working conditions that can achieve the same degree of separation can be used
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Table 2 Chromatographic column and typical working conditions

Figure 1 Typical chromatogram of tetrachloroethylene (column temperature 90℃)

Figure 2 Typical chromatogram of tetrachloroethylene (column temperature 110℃)

Table 3 Retention time t _R and relative retention value r of each component when the column temperature is 90℃

Table 4 Retention time t _R and relative retention value r of each component when the column temperature is 110℃

Table 5 Relative correction factor f _{i of} each component

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3 Chromatographic data processor or integrator
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4 Micro sampler
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