，请参考这个标准，谢谢
Total Hydrocarbons in Gases - Flame Ionization Detection Method (GB/T 8984.3-1997)
This technical standard (GB/T 8984.3-1997), issued by the China Standardization Administration Committee and the National Metrological Service Administration, defines the detection and quantification of total hydrocarbons (THC) in gas streams using flame ionization detection (FID) methods.
The standard applies to industrial, medical, meteorological and other laboratories, research institutions, and other organizations where low levels of total hydrocarbons are present in gas samples. The goal of the standard is to provide users with a quantitative method to accurately determine the amount of total hydrocarbons in a gas stream.
The standard outlines the detection and quantification protocol, sampling requirements, instrumentation and equipment, reagents, and interpretation of results. Additionally, the standard describes the FID apparatus and analysis process, calibration of the instrumentation, and preparation of sample solutions.
The FID device operating principle is based on principles of oxidative pyrolysis, where the flame generated by the FID is used to destructively decompose the hydrocarbons into their component carbon atoms. The individual carbon atoms are then ionized by the electric field generated by the ionizing electrodes. This ion-molecule reaction resulting from the flame injection of the sample is detected by electrodes and the intensity of the electrical current produced is used to indicate the quantity of ions.
The flame intensity, background signal of the electrolysis, and electrode current should all be monitored to ensure proper operation during the analysis.
The standard also establishes the required performance levels for accuracy and repeatability, as well as minimum detection limits and precision of the measurements.
Safety requirements are also outlined in the standard regarding the operation and handling of solvents, reagents, and desiccants.
Overall, the GB/T 8984.3-1997 standard provides users with a standardized, quantitative method to detect and evaluate the amount of THC present in a gas stream.
