15


The Calibration Curve, Repeatability, and Retrapping Results


The standard mixture of benzene, toluene, ethylbenzene, m,p-xylene, o-xylene, styrene, 1,4-dichlorobenzene, and tetradecane were measured. The TIC chromatogram is shown in Figure 2, and the calibration curve linearity, repeatability, and retrapping results are shown in Table 2. The range of the calibration curve created was 10 ng to 1000 ng, and for all compounds, a good result was obtained, with R>0.999. As an example, the calibration curve for toluene is shown in Figure 3. In addition, when the repeatability was checked at 10 ng, the minimum concentration in the calibration curve, the % RSD (n=5) for all compounds was found to be 5% or less. Furthermore, when the measurement repeatability was checked by retrapping at 10 ng using the TD-30R retrapping (Restore) function, the % RSD (n=5) for all compounds was 6% or less.


Table 2. Results for Calibration Curve Linearity, Repeatability at 10 ng, and Retrapping Results. 10 ng


ID Compound Retention Time


1 Benzene


2 Toluene-D8 3


Toluene


5 6 7


1.978 2.871 2.918


4 Ethylbenzene 4.154 m,p-Xylene Styrene


4.270 o-Xylene


8 1,4-Dichloro Benzene


9 Tetradecane m/z Linearity (R) Average


78 0.9997903 98


------------


91 0.9998511 91 0.9997918 91 0.9998336


4.587 104 0.999927 4.624


6.510 146 0.999958 9.502 57 0.9999466 91 0.9997498


Concentration 1 time 8.9


----------- 9.3 8.4 9.3


10.7 9.4 9.7


11.1


Retrapping 9.0


------------ 9.2 8.4 9.3


10.5 9.3 9.7


10.8 10 ng


Concentration %RSD (n=5)


1 time 2.6


----------- 4.6 3.9 2.3 3.8 3.7 3.9


2.1


Retrapping 2.1


------------ 3.6 1.7 3.6 3.5 5.9 5.9


2.3


Conclusion Figure 2. TIC Chromatogram for the 1000 ng Standard Sample.


This article described an analysis of VOCs frequently analysed in voluntary assessments of vehicle interiors and vehicle interior materials using the TD-30R + GCMSQP-2020NX with nitrogen as the carrier gas. Favourable values were obtained for the calibration curve, repeatability, and retrapping results. Using this method it was possible to measure nine VOCs (toluene, benzene, ethylbenzene, m,p,o-xylene, styrene, 1,4-dichlorobenzene, andtetradecane) within a vehicle interior using nitrogen as the carrier gas. Even when nitrogen is used, the mass spectrum is virtually the same as that when helium is used as the carrier gas. This means that existing mass spectral libraries can be used as is. For qualitative applications or quantitative analysis at a µg/mL (ppm) level, it is possible that a transition to nitrogen carrier gas can be made.


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Figure 3. Toluene Calibration Curve Analysed with Nitrogen as the Carrier Gas (10 ng, 40 ng, 100 ng, 400 ng, 1000 ng).


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