Study on the Method of Improving the Measurement Accuracy of the Unregulated Pollutants

To study the unregulated pollutants more accurately, several appropriate vehicles were tested. Three positions were selected for data collection , such as the CVS dilution tunnel sampling point, air bag sampling point and the air pump outlet sampling point of the pump outlet. The aldehydes and ketones were analyzed by solid phase extraction - high performance liquid chromatography (HPLC). Experiments show that compared with the sampling point of the dilution tunnel and the air pump outlet sampling points, the gas concentration at the sampling point of the exhaust gas analyzer is uniform and stable, and it is suitable for the collection of unconventional pollutants with low concentration. Collecting here can reduce the experimental error and improve the measurement accuracy.