Interpretation of the hottest standard release of

2022-08-17
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[standard interpretation] the first domestic VOCs navigation standard was released

[standard interpretation] the first VOCs navigation standard in China was released

May 11, 2021

recently, Shanghai municipal market supervision administration, Jiangsu provincial market supervision administration and Zhejiang provincial market supervision administration jointly approved the release of the technical specifications for volatile organic compounds navigation monitoring in the Yangtze River Delta eco green integrated development demonstration area (hereinafter referred to as the specifications) db31/t. The specification specifies the method overview, reagents or materials, instruments and equipment, monitoring methods, result calculation and expression, quality assurance and quality control, and safety protection requirements of volatile organic compounds' navigation monitoring. The demonstration area covers Qingpu District of Shanghai, Wujiang District of Suzhou City, Jiangsu Province and Jiashan County of Jiaxing City, Zhejiang Province

interpretation of standard definition of navigation

as the first VOCs navigation technical specification at home and abroad, the specification defines the concept of navigation monitoring for the first time: continuous automatic monitoring during travel by using on-board rapid monitoring equipment, combined with fixed-point monitoring, qualitative and quantitative analysis of pollutants, and display the spatial continuous distribution of pollutants along the travel route based on geographical location information. Here, it is clear that "continuous automatic monitoring" is required, and at the same time, it is required to "display the continuous spatial distribution of pollutants along the travel route", which requires that the rapid monitoring equipment can realize real-time monitoring and measure the pollutant composition and concentration information, and it is no longer a laboratory or portable device to realize mobile fixed-point monitoring after on-board.

navigation instruments

specifications There are also clear requirements for navigation instruments and equipment, including mass spectrometer, vehicle mounted atmospheric sampling system, gas dilution system, industrial computer, power supply equipment, vehicle mounted satellite positioning system, electronic map, meteorological monitoring system and other equipment, which to a certain extent eliminates some low-end monitoring technologies and avoids the problems of inaccurate data, low sensitivity and incomplete monitoring factors, It is also required that the power of the power supply equipment should at least meet the continuous operation of the navigation monitoring equipment for more than 4 hours to meet the requirements of the site environment

navigation speed

the specification proposes that the navigation monitoring should be carried out according to the planned route, and the route can be adjusted appropriately if necessary. The travel monitoring speed should meet the requirement that a set of effective monitoring data can be obtained every 25 to 35 M. According to this requirement, if the travel speed is 20 kilometers per hour, the time interval of each group of monitoring data needs to be within 6 seconds, which means that the travel monitoring must be monitored and analyzed by fast single mass spectrometry. If the laboratory chromatography-mass spectrometry method can not meet the requirements of travel speed

navigation results

it is worth noting that the presentation of monitoring results is emphasized many times in the specification, such as: 7.3.3 record the maximum concentration of pollutants at the monitoring point TVOC or of special concern, as well as the corresponding monitoring time, GPS coordinates, road location, pollutant components, meteorological characteristics and other information; 8.3.4 after the completion of navigation monitoring, draw the distribution map of the total concentration of volatile organic compounds or the concentration of single or multiple VOCs pollutants monitored on the navigation path, and the concentration of pollutants is distinguished by color. From these requirements, it can be seen that the navigation results need to contain at least four elements: time place concentration component

standard features the first

in China. At present, there is no national or local standard or specification for volatile organic compounds' navigation monitoring, and the specification is the first standard document for volatile organic compounds' navigation monitoring

strong technical compatibility

the specification requires the whole process of volatile organic compounds navigation monitoring, takes into account the technical principles of existing navigation equipment in the market, and does not limit the types of ion sources and mass analyzers

taking into account the needs of law enforcement

the specification fully takes into account the needs of monitoring and law enforcement, and puts forward clear requirements for the record of navigation results: it meets the work contents and needs of the monitoring department and law enforcement department, and standardizes the implementation of navigation monitoring work in terms of monitoring plan formulation and monitoring implementation steps, which is conducive to the standardized implementation of detection and law enforcement, operational monitoring and scientific research

monitoring and management linked

the specification fully takes into account the existing technical characteristics and management needs. In the appendix, two material component tables are formulated. One is the necessary component, which has less components, indicating that the monitoring ability of existing navigation equipment is fully considered, and it is a pollutant of great concern in daily work. The other is 29 selected test components, which can be seen from the material components, taking into account the strong photochemical activity Odor and toxic and harmful substances have fully considered the needs of management

technical specifications for volatile organic compounds (VOCs) navigation monitoring in the Yangtze River Delta eco green integrated development demonstration area

1 Scope

this document stipulates the method and principle of using navigation monitoring technology to measure the concentration of VOCs in ambient air and unorganized exhaust gas, and displaying the spatial distribution of VOC concentration in combination with geographical location information, instrument performance requirements Monitoring implementation methods and quality control methods

this document is applicable to the Yangtze River Delta ecological green integrated development demonstration zone, and other regions in the Yangtze River Delta implement this document, which is approved and implemented by the provincial (municipal) people's governments

2 normative references

the contents of the following documents constitute essential clauses of the document through normative references in the text. Among them, for dated references, only the version corresponding to the date is applicable to this document; For undated references, the latest version (including all amendments) is applicable to this document

hj/t 55

technical guidelines for unorganized emission monitoring of air pollutants

hj 168

technical guidelines for the preparation and revision of standards for environmental monitoring and analysis methods

hj 194

technical specifications for manual monitoring of ambient air quality

hj/t 212

technical guidelines for the transmission of automatic monitoring (monitoring) systems for pollution sources

hj 654

ambient air gaseous pollutants (SO2, NO2, O3, CO) Technical requirements and detection methods of continuous automatic monitoring system

HJ 759

volatile organic compounds in ambient air can calculate the determination of tensile energy absorption tank sampling/gas chromatography mass spectrometry

HJ 818

gaseous pollutants in ambient air (SO2, NO2, O3, CO) Technical specifications for operation and quality control of continuous automatic monitoring system

HJ 1010

technical requirements and detection methods of gas chromatography continuous monitoring system for volatile organic compounds in ambient air

3 terms and definitions

the following terms and definitions are applicable to this document

3.1 volatile organic compounds

organic compounds involved in atmospheric photochemical reactions, or organic compounds determined according to relevant regulations. Generally, it refers to organic compounds with a vapor pressure of not less than 10 Pa at 20 ℃, or with a boiling point of not more than 260 ℃ at 101.325 kPa standard atmospheric pressure, or organic compounds (except methane) with the above corresponding volatility under actual production conditions, referred to as VOCs for short

3.2 total volatile organic compound

on the navigation monitoring equipment that meets the requirements of this specification, measure the single VOCs, add it to get the total amount of VOCs, and calculate it by the sum of the mass concentration of single VOCs, referred to as TVOC

3.3 cruise monitoring

the technology of continuous real-time monitoring in the movement by using vehicle mounted air sampling system and rapid monitoring equipment, combining with high concentration point fixed-point monitoring, qualitative and quantitative analysis of pollutants, and combining with geographical location to display the spatial distribution of pollutants

4 method principle

using the vehicle mounted volatile organic compounds rapid monitoring equipment, the ambient air, plant boundaries, unorganized emissions, and then attract enterprises to participate in the military civilian integration technology transaction during the travel are continuously monitored in real time. According to the geographical location information, the spatial distribution of volatile organic compounds concentration along the travel route is displayed, and the high concentration points are retested or monitored at fixed points to complete qualitative and quantitative analysis

5 reagents and materials

5.1 high purity nitrogen: ≥ 99.999%

5.2 standard gas of 116 volatile organic compounds: 1mol/mol, n equilibrium

5.3 internal standard gas: according to the actual demand of monitoring equipment

6 instruments and equipment

6.1 mass spectrometer

includes sample injection system, ion source, mass analyzer and data analysis software. It has the functions of full spectrum scanning analysis, spectrum library retrieval, real-time display of air pollution components, etc. It has certain anti electromagnetic interference, anti vibration, anti lightning and other capabilities

6.2 vehicle mounted atmospheric sampling system

the sampling system can adopt the sampling header that meets the requirements of HJ 654, or directly adopt the independent pipeline that meets the requirements. The sampling pipeline should be as short as possible to reduce the adsorption of the target compound. Materials that do not react with the monitored pollutants and do not release interfering substances should be selected. Generally, polytetrafluoroethylene and silylated stainless steel pipes are used as materials. When using multi branch sampling header, the sampling branch of volatile organic compounds should be located in the front of the sampling header. The sampling port shall be more than 0.2m higher than the roof, and shall not be disturbed by vehicle exhaust emissions. The sampling pipeline shall be insulated to avoid condensation on the inner wall of the sampling pipeline

6.3 gas dilution system

the maximum dilution ratio shall not be less than 1000 times. The gas dilution system shall meet the requirements of Table 1

Table 1 performance index requirements of gas dilution system

index

requirements

dilution gas mass flow

0~10 l/min

standard gas mass flow

0~100 ml/min

flow accuracy

-1%~1% full scale

flow output repeatability

-0.15%~0.15% full scale

linear

-0.5%~0.5% full scale

input gas pressure

12~35. At the same time, strain or other more advanced test methods can be adopted Psig

6.4 the industrial computer

should meet the requirements of hj/t 212 to ensure the operation of the system and transmit data to the upper platform

1) communication interface: it has one RS-485 or RS -232 or Ethernet communication interface for communication with the upper computer

2) storage capacity: it can completely store all parameter monitoring data and alarm information for at least 12 months (calculated by recording a group of data every 1 minute), and the storage capacity is not less than 300gbytes

4) anti interference ability: it has the ability of anti lightning, anti electromagnetic interference, anti vibration, etc

5) voltage stability: allow external power supply voltage fluctuation ± 10%

6.5 the power supply equipment

should be equipped with a battery pack, and the power should at least meet the continuous operation of the navigation monitoring equipment for more than 4H. The external power supply can directly supply power to the equipment

6.6 on board satellite positioning system and electronic map

equipped with on-board satellite positioning system, the longitude and latitude coordinates are recorded during navigation monitoring, and the travel path is displayed on the map in real time. The positioning accuracy of the on-board positioning system is within 3M

6.7 other equipment

wind direction anemometer, tank, portable gas chromatography mass spectrometer and other equipment shall be equipped as required

7 monitoring method

7.1 instrument preparation

7.1.1 establish calibration curve. The calibration curve should contain at least five concentration points except zero, and the range of the calibration curve can be adjusted according to the actual working conditions. Under the working conditions of the instrument, dilute the mixed standard gas to the concentration point of the standard curve with high-purity nitrogen, and analyze and determine it from low concentration to high concentration in turn, or analyze and determine it in the way of different injection volumes, with the concentration of the target compound as the abscissa and the response of the characteristic ion peak of the target compound as the ordinate

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