The use of survey instrumentation for air quality appraisal

1. Verification of high-tech monitoring instruments In order to improve the level of environmental air monitoring, Jinan Environmental Monitoring Station carried out a comprehensive technical transformation work. In January 1998, it introduced high-tech modern monitoring equipment from the United States. Whether the new instrument complies with the requirements of the National Atmospheric Monitoring Code to ensure the accuracy and reliability of routine monitoring and air weekly and daily reports in our city. We used the TSP in the air as an example to conduct comparative monitoring tests of new and old instruments.

1.1. Test equipment BAM 1020 type ray tester, (abbreviation instrument) one, number U4027.

In compliance with the National Air Monitoring Standards CD? One type of TSP high flow continuous sampler (abbreviated as TSP). Number 9425.

1.2 Test Methods A comparative test was conducted at substation No. 2 of Jinan Environmental Protection Monitoring Station. The instrument sampling pipeline extends to the height of 1 meter above the fifth floor. Sample 24 hours per hour, 24 hours a day. At the same time, the TSP large flow sampler was placed on the fifth floor platform one meter away from the mouth of the meter and continuously sampled 24 hours a day. The comparison test was conducted for 4 days.

1.3 Sample Analysis and Data Processor Test data is directly analyzed and displayed by the instrument itself and processed by the computer system to calculate the daily average. The samples collected by TSP for large flow rate were analyzed and calculated by artificial weighing method. The results of the instrument test were compared with the TSP mass flow test results (daily average) and the relative deviations and correlation coefficients were calculated. At the same time, two instruments were used to monitor the trend of the daily average value of TSP.

1.4 The test results showed that the mean value of the TSP monitored by the old and new instruments was 0.341 mg/m3 and 0.36 mg/m3, respectively, with an average relative deviation of -5.3, with a maximum relative deviation of -10.5 and a fluctuation range of 10.5 to 7.5. Is 0.68. The monitoring results fully demonstrated that there was no significant difference between the average TSP measured by the analyzer and the TSP measured by the TSP large flow sampler. Therefore, it can be considered that the two kinds of test instruments are equivalent to determine the TSP, so the instrument is fully in line with the requirements of the national monitoring specification.

2. The role of high-tech monitoring instruments in improving the quality of environmental monitoring is in line with the national monitoring standards. However, has the quality of monitoring been improved compared with the original equipment for this purpose on July 21, 1999? At the same spot on August 20, two sets of comparative tests for the same type of monitoring instrument TSP were performed. One set is a BAM 1020 type instrument, two instruments U4027 and U4026; one is a CD111 type TSP high flow sampler, number 9423 and 9424 two instruments. Sampling process and sample analysis, data processing as above. According to the data of the two instrument tests, the relative deviation and average deviation of the monitoring data of each group of instruments are calculated, and the trend curves of the two sets of instrument monitoring data are made at the same time.

By comparison, it can be seen that the relative deviations and average deviations of the two monitors are significantly smaller than the relative deviations and average deviations of the TSP mass flow monitor.

This shows that the instrument monitoring quality is better than the large flow monitoring quality. The reason is that the newly introduced high-tech instrument instrument is controlled by computer, continuous automatic monitoring, no artificial participation in the middle, eliminating some human error, so the monitoring results are more accurate and more reliable. Its monitoring quality has improved by 5 percentage points compared with the original. The same SO2, NOX, and CO automatic monitoring instruments have also been used for comparative tests. The monitoring quality is also much better than the original monitoring instruments.

3. Conclusion In July 1997, the Jinan City Environmental Monitoring Station began a comprehensive monitoring of technological innovation and technological transformation of monitoring instruments. With the introduction of the high-tech modern air automatic monitoring instrument equipment of American API Company in January 1998, all monitoring points (substations) in Jinan City have also undergone a complete renovation and transformation, and new monitoring instruments and equipment have been installed and operated at each substation. Debugging has brought the entire monitoring system into a modern state of automatic operation. As a result, routine air monitoring in Jinan City has entered a new stage. A series of technological reforms have led to the improvement of monitoring quality, which has led to the release of the ambient air quality daily and weekly reports in major cities across the country. It has also led the provincial and municipal environmental protection bureaus to make decisions on environmental management and the blue sky project of Jinan City. The smooth implementation provides a reliable basis.