为确保《技术规定》中的各项指标科学可行，编制组组织市场较常见的非甲烷总烃连续自动监测仪器开展实验室标准气体和环境空气比对测试，15台仪器40余位技术人员参与测试，近20种标准气体，获取有效数据几十万条。根据仪器实际测试结果，并经过仪器厂商交流和多次专家讨论，重点针对环境空气中非甲烷总烃浓度水平低等特点，明确了环境空气非甲烷总烃连续自动监测系统的方法，根据实测数据提出了环境空气非甲烷总烃连续自动监测系统验收的性能指标要求，包括检出限、空白、峰型、校准曲线、24h漂移、重复性、准确性、高浓度残留、响应时间、多组分示值误差等，以及系统质量控制的周期和要求等。


浩瀚色谱（山东）应用技术开发有限公司，，研发出直测法甲烷总烃分析的专用柱HH-NMHC，满足2021国标，结果准确。


《环境空气非甲烷总烃连续自动监测系统技术规定（试行）》发布 测试谱图：



"Technical Regulations for Continuous Automatic Monitoring System for Non-Methane Total Hydrocarbons in Ambient Air (Trial)" released
Release of "Technical Regulations for Continuous Automatic Monitoring System for Non-methane Total Hydrocarbons in Ambient Air (Trial)" Details:

Name: Methane total hydrocarbon composite column
Specifications: 1m*1/8
Model: HH-NMHC
Application: "Technical Regulations for Continuous Automatic Monitoring System of Non-methane Total Hydrocarbons in Ambient Air (Trial)" released 2021

The 2021 National Ecological Environment Monitoring Plan clearly states that "the NMHC monitoring of ambient air in cities at the prefecture level and above nationwide" is required, and "automatic monitoring" is required.

There are two common methods for measuring NMHC concentration:
1. It is difference subtraction,
2. It is the direct measurement method (also known as the "direct method").
The former has been widely adopted in the early years, while the latter has been concerned, valued and practically applied in the past two years, and will become a regulatory trend.

In order to ensure that the indicators in the "Technical Regulations" are scientific and feasible, the compilation group organized the continuous automatic monitoring instruments for non-methane total hydrocarbons, which are more common in the market, to carry out the comparison test of laboratory standard gas and ambient air. More than 40 technicians from 15 instruments participated. Test, nearly 20 standard gases, and obtain hundreds of thousands of valid data. According to the actual test results of the instrument, and through exchanges between instrument manufacturers and many expert discussions, focusing on the characteristics of low concentration of total non-methane hydrocarbons in ambient air, the method of continuous automatic monitoring system for non-methane total hydrocarbons in ambient air is clarified. According to the measured data The performance index requirements for the acceptance of the continuous automatic monitoring system for non-methane total hydrocarbons in ambient air are put forward, including detection limit, blank, peak shape, calibration curve, 24h drift, repeatability, accuracy, high concentration residue, response time, multi-component Indication error, etc., as well as the cycle and requirements of system quality control, etc.


Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. keeps pace with the times and has developed a special column HH-NMHC for direct measurement of methane total hydrocarbons, which meets the 2021 national standard and the results are accurate and reliable.


"Technical Regulations for Continuous Automatic Monitoring System of Non-methane Total Hydrocarbons in Ambient Air (Trial)" released Test spectrum: