A rapid monitoring method plays an increasingly important supporting role in the environmental emergency monito-ring.In this study,portable catalytic oxidation-hydrogen flame ionization detector-measuring method was used to rapidly detect the non-methane total hydrocarbons in ambient air.The detection limit,precision and accuracy of the method were determined and compared with the standard method in the laboratory.The results showed that the detection limit was 0.127 mg/m3,the precision was between 0.1%to 3.6%,and the determination result of standard sample was accurate.This method is more convenient,rapid,time-saving,data timeliness,and can provide technical support for the disposal of sudden air environmen-tal events.
The acoustic environment monitoring points in the functional area of Urumqi have been optimized and adjusted ac-cording to the relevant standards and technical regulations.The rationality and uniformity of the number and spatial layout of the optimized and adjusted monitoring points were analyzed and studied,and 24 h fixed-point monitoring was carried out.The monitoring results of various functional areas were compared with the horizontal and census monitoring results,and the longitu-dinal comparison was made with the monitoring data of nearly 8 years of functional areas.The results proved that the number of optimized and adjusted monitoring points is compliant,reasonable,representative and feasible,which can lay a foundation for objective evaluating the sound environment quality of Urumqi city and carrying out noise pollution prevention and control.
《干旱环境监测》,投稿及联系邮箱:ghjc7080@126. com;电话:0991 -6116527;国内统一刊号:CN65 -1117/X;国际标准刊号:ISSN1007-1504.
Based on the 2021 data collected by the emission remote sensing instrument,the paper analyzed the number of ve-hicles,the daily change of emission,the annual change and the cumulative contribution rate of the typical trunk roads in Uru-mqi,it also provides technical support for the revision of vehicle remote sensing detection standard limits and scientific man-agement of old vehicles.
Total phosphorus is an important index of environmental water monitoring.The analytical method for determining to-tal phosphorus in water is ammonium molybdate spectrophotometry at present.According to the requirements of"determination of total Phosphorus in water quality by ammonium molybdate spectrophotometry"(GB 11893-1989)and the actual situation of water quality detection,the uncertainty of determination of total phosphorus in environmental water by ammonium molybdate spectrophotometry was analyzed and assessed.By establishing a model,the source of uncertainty is analyzed,the component of uncertainty is calculated,and the relative standard uncertainty is synthesized.The results shows that the relative standard uncertainty of this method is 0.023 5 and the extended uncertainty is 0.05 mg/L(k =2).Based on the results of the uncer-tainty component,some suggestions are put forward to reduce the uncertainty of the method.
