Patent ID: 11913863
Assignee: HARBIN INSTITUTE OF TECHNOLOGY, WEIHAI
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A microplastic detection method based on a pyrolysis-mass spectrometry technology by using the microplastic detection device based on pyrolysis-mass spectrometry technology according to claim 1, the microplastic detection method comprising the following steps:
1) adding a microplastic sample to a quartz slide within a quartz tube of a pyrolysis device, filling the quartz tube with high-purity quartz fiber, connecting a temperature measurement wire onto the slide on which the sample is located within the quartz tube, and then connecting a working gas source, a pyrolysis device, a filter and a mass spectrometer in a sealing manner via pipelines;
2) turning on the working gas source and regulating a gas flow to enable a working gas to sequentially pass through the flow regulating device, the pyrolysis device and the filter to reach a sample inlet of the mass spectrometer, firstly introducing the carrier gas, and after air in the pipelines is removed, continuously introducing the carrier gas;
3) after turning on the power supply of the temperature programming device, setting a temperature-programmed process by the control system, wherein a temperature collected by the temperature measurement wire is converted into an electrical signal by means of a temperature conversion circuit, and then the electrical signal is received by the acquisition card, and then an output power of the heating module circuit is adjusted by means of a PID algorithm of the control system, that is, a heating power of an electric heating wire is adjusted, and thus a heating rate within the quartz tube is adjusted; and
4) decomposing the microplastic sample in the quartz tube, and transporting pyrolysis products from the microplastic sample to the mass spectrometer for detection and analysis after being filtered by the filter under drive of the carrier gas of the working gas source, so that qualitative and quantitative analysis of the microplastic sample is realized by the mass spectrometer.