Method to monitor mass of particulate matters in dew retained by plant leaves in urban green districts

Abstract

The invention discloses a method to monitor and calculate mass of particulate matters in dew retained by plant leaves in urban green districts. The method comprises the steps of counting a sum of leaves for a plant; acquiring leaves of different underlying surface typical plants; cleaning the surface of each leaf group, evenly dividing the various leaves into two groups, and fixing the leaf groupsto polystyrene foam plates respectively, with hairy faces facing up; at the beginning of dew formation, placing the polystyrene foam plates at a monitoring site, and keeping the polystyrene foam plates parallel to the ground surface and at the canopy of the plants; at the moment of dew evaporation from formation, bringing back one polystyrene foam plate to a lab in sealed manner, washing the surface of the leaves with deionized water in oscillating manner, recording the quantity of the deionized water, and testing the concentration of particulate matters in washing water; after all dew evaporates, bringing the rest polystyrene foam plate to the lab, and repeating the above operations. The method is capable of monitoring and calculating masses of particulate matters of different sizes, indewing-evaporating period, in dew retained by plant leaves in urban ecosystem green districts.

Description

technical field [0001] The invention relates to the technical field of particulate matter monitoring, in particular to a method capable of effectively monitoring and calculating the amount of particulate matter intercepted by leaves of surface plants in urban green areas to dew. Background technique [0002] Dew condensation is a common meteorological phenomenon. During its formation, fine aerosols in the atmosphere are used as condensation nuclei, which play an important role in air purification. Dew condensation is a natural process of sedimentation and removal of near-surface particulate matter. The green area in the urban ecosystem is an important place for dew condensation, and the annual dew amount can reach 60mm, which is equivalent to the level of a heavy rain. The concentration of particulate matter in dew is significantly higher than that of other wet deposition forms such as rainwater. The concentration of dissolved particulate matter in dew is 271.36mg / L, and the...

AI Technical Summary

Problems solved by technology

The method used is to "use alcohol cotton balls moistened with distilled water to thoroughly elute and wipe the surface of the leaves to remove the dust trapped on the leaves", but it is not thorough to rely on wiping alone, such as some fine particles on the fluff or folds of the leaves medium, cannot be guaranteed to be completely wiped clean

Therefore, the calculation results of the existing methods are not accurate

[0007] 3. Existing methods can only calculate the total particle mass (TSP), which can be divided into inhalable particulate matter (PM 10 ) and particulate matter (PM 2.5 ) and total suspended particulate matter (TSP), etc., but cannot measure PM, which is very important for haze weather and human health. 2.5 and PM 10 and other indicators

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