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A method for measuring the net deposition atmosphere pm on the leaf surface of plants

A plant leaf and atmospheric technology, applied in the direction of measuring devices, material absorption weighing, suspension and porous material analysis, etc., can solve problems such as difficult to calculate the weight of dust per unit area, large water volume, and low PM content on the leaf surface

Active Publication Date: 2021-09-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are obvious defects in this measurement method: 1) The leaf surface PM eluted by the soft brush method will be different from the leaf surface PM eluted by rainwater in practice. For example, the PM intercepted by the leaves of plants with trichomes may use The amount of leaf surface PM eluted by soft brush or immersion is more, but the amount of leaf surface PM eluted by actual rainwater is less; 2) In immersion method, part of leaf surface PM (especially PM2.5) is easily soluble in water, especially The amount and ratio of PM dissolved in water on the leaf surface before and after rainwater elution may be different, resulting in a large system error; 3) The amount of water used for soaking or cleaning is large, resulting in a relatively small amount of eluted PM, which will also increase to a certain extent Weighing error
[0007] In addition, direct application of optical microscope, electron microscope, scanning electron microscope, etc. to take photos of PM on plant leaf surface, and then use image analysis software to count the number of particles with different particle sizes on the leaves. This method is to analyze the effect of plants on PM from the number of PM However, due to the different size, shape, nature and density of PM on the leaf surface, it is difficult to calculate the accurate dust retention weight per unit area.

Method used

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  • A method for measuring the net deposition atmosphere pm on the leaf surface of plants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The experimental object is Osmanthus fragrans (Thunb.) Lour. The sampling site is the campus of Kunming University of Science and Technology, Chenggong District, Kunming City, Yunnan Province. When sampling, select healthy leaves of the same quality around the canopy, handle them gently to prevent PM from scattering on the leaf surface, and seal the leaves in a clean fresh-keeping box immediately after harvesting. .

[0021] Specific steps are as follows:

[0022] 1) After the first rainfall, the control leaves (CK) were bagged to prevent dust retention on the leaf surface; the dust retention leaves normally retained dust;

[0023] 2) Before the second rainfall, collect samples of control leaves and dust-retaining leaves, and measure the weight G of the control leaves CK1 is 0.4830g, area S CK1 17.562×10 -4 m 2 , the weight G1 of the dust retention blade is 0.5750g, and the area S1 is 21.118×10 - 4 m 2 ;

[0024] 3) After the second rainfall is over, when the r...

Embodiment 2

[0027] The experimental object is camphor tree (Cinnamomum camphora (L.) Presl). The sampling site is the campus of Kunming University of Science and Technology, Chenggong District, Kunming City, Yunnan Province. When sampling, select healthy leaves of the same quality around the canopy, handle them gently to prevent PM from scattering on the leaf surface, and seal the leaves in a clean fresh-keeping box immediately after harvesting. .

[0028] Specific steps are as follows:

[0029] 1) After the first rainfall, the control leaves (CK) were bagged to prevent dust retention on the leaf surface; the dust retention leaves normally retained dust;

[0030] 2) Before the second rainfall, collect samples of control leaves and dust-retaining leaves, and measure the weight G of the control leaves CK1 is 0.6067g, area S CK1 34.208×10 -4 m 2 , the weight G1 of the dust retention blade is 0.7921g, and the area S1 is 35.452×10 - 4 m 2 ;

[0031] 3) After the second rainfall is ove...

Embodiment 3

[0034] The subject of the experiment was Loropetalum chinense var. rubrum. The sampling site is the campus of Kunming University of Science and Technology, Chenggong District, Kunming City, Yunnan Province. When sampling, select healthy leaves of the same quality around the canopy, and handle them gently to prevent PM from scattering on the leaf surface. Seal the leaves in a clean fresh-keeping box immediately after harvesting .

[0035] Specific steps are as follows:

[0036] 1) After the first rainfall, the control leaves (CK) were bagged to prevent dust retention on the leaf surface; the dust retention leaves normally retained dust;

[0037] 2) Before the second rainfall, collect samples of control leaves and dust-retaining leaves, and measure the weight G of the control leaves CK1 is 0.0824g, area S CK1 is 5.113×10 -4 m 2 , the weight G1 of the dust retention blade is 0.1215g, and the area S1 is 7.017×10 -4 m 2 ;

[0038] 3) After the second rainfall is over, when ...

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Abstract

The invention discloses a method for measuring the net deposition atmospheric PM on the leaf surface of plants, which belongs to the field of human settlement environment. The present invention comprehensively considers various removal and retention modes of PM retained by plant leaves, and considers that the leaf surface PM eluted by rainwater is the net deposition amount of plant leaf surface to atmospheric PM. At the same time, the bagging method is used to provide the non-dust-retained control of the leaves, and the error caused by the water absorption and weight gain of the leaves after the dust is washed by the rain is effectively controlled by the differential weight method, and the net deposition of the plant leaf surface on the atmospheric PM is accurately measured. This method is not only true, simple and easy to implement, but also has high accuracy, which has important theoretical and practical significance for evaluating the net deposition of plants on atmospheric PM in human settlements.

Description

technical field [0001] The invention relates to a method for measuring net deposition atmospheric PM on plant leaf surfaces, belonging to the field of human settlements. Background technique [0002] Air pollution is an important environmental problem faced by many countries and regions. With the increasing level of urbanization and the continuous expansion of cities, especially for developing countries such as China and India, urban atmospheric particulate matter (PMs, 0.2-100μm) pollution has become one of the most pressing environmental problems. The English abbreviation of particulate matter is PM. Among them, PM2.5 is particulate matter with an aerodynamic equivalent diameter of less than or equal to 2.5 μm, which is rich in a large amount of toxic and harmful substances and is the main cause of haze weather; PM10 is a particle with an aerodynamic diameter of less than 10 μm, which can into the airways and upper lung areas. Some studies have shown that short-term (&l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/02G01N15/06
CPCG01N5/02G01N15/0612
Inventor 郑伟高雅
Owner KUNMING UNIV OF SCI & TECH