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A method for determining the effective dust retention on the leaf surface of plant leaves

A technology of plant leaves and dust retention, applied in measuring devices, material weighing, instruments, etc., can solve the problem of different sizes, shapes, properties, densities, poor practical significance, and it is difficult to calculate the weight of dust retention per unit area, etc. problems, to achieve the effect of improving experimental methods, improving air quality, and improving experimental accuracy

Active Publication Date: 2021-10-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1) the error caused by the weight of water attached to the leaf surface and even absorbed by the mesophyll cells during the soaking process is not taken into account; 2) the traditional differential gravity method is to soak the leaves in water or simulate artificial rainfall, while There is a certain difference with natural rainwater elution, and the practical significance is poor
[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 The interception capacity can assist in the interpretation of the above-mentioned differential weight method for the measurement of leaf dust retention. Due to the different sizes, shapes, properties, and densities of leaf surface PM, it is difficult to calculate the accurate weight of dust retention per unit area.

Method used

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  • A method for determining the effective dust retention on the leaf surface of plant leaves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The experimental subjects choose Ginkgo biloba ( Ginkgo biloba ). 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) Before the rain washes off, the weight G1 of the dust-retaining leaf is 0.756g, and the leaf area S1 is 25.363×10 -4 m 2 ;

[0023] 2) The weight G3 of the non-dust-retained blade before the rainwater wash-off is 0.601g, and the blade area S3 is 20.921×10 - 4 m 2 (It can be seen from the images scanned by SEM electron microscope that after the blade is wiped, its PM projected area accounts for 30-50% of the PM projected area before wiping, which meets the requirements and can be idealized as a ...

Embodiment 2

[0028] The experimental subjects choose camphor tree ( Cinnamomum camphora ). 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. .

[0029] Specific steps are as follows:

[0030] 1) Before the rain washes off, the weight G1 of the dust-retaining leaf is 0.703g, and the leaf area S1 is 28.622×10 -4 m 2 ;

[0031] 2) Before the rain washes off, the weight G3 of the leaf without dust retention is 0.574g, and the leaf area S3 is 25.367×10 - 4 m 2 (It can be seen from the images scanned by SEM electron microscope that after the blade is wiped, its PM projected area accounts for 30-50% of the PM projected area before wiping, which meets the requirements and can be idealized...

Embodiment 3

[0036] The experimental subjects chose ‘Phnom Penh’ holly euonymus ( Euonymus japonicas 'Jinbian'). 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. .

[0037] Specific steps are as follows:

[0038] 1) Measure the weight of the dust-retaining leaf G1 before the rain washes off. The weight of the leaf G1 is 0.298g, and the area of ​​the leaf S1 is 7.903×10 -4 m 2 ;

[0039] 2) Before the rain washes off, the weight G3 of the leaf without dust retention is 0.236g, and the leaf area S3 is 6.502×10 -4 m 2 (It can be known from the image obtained by scanning the SEM electron microscope that after the blade is wiped, its PM projected area accounts for 30-50% of the PM proje...

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Abstract

The invention discloses a method for measuring the effective dust retention amount on the leaf surface of plant leaves, which belongs to the field of plant dust retention measurement. The present invention comprehensively considers various removal and retention modes of PM retained on the leaf surface, and considers that the leaf surface PM eluted by rainwater is the effective amount of dust retained by the blade. At the same time, the weight difference caused by the water absorption and weight gain of the leaves under the action of rainwater is removed, and the PM eluted from the surface of plant leaves by natural rainwater is accurately measured by the differential weight method, that is, the effective dust retention capacity.

Description

technical field [0001] The invention relates to a method for measuring the effective dust retention amount on the leaf surface of plant leaves, belonging to the field of plant dust retention measurement. 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 stud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00G01B11/28
Inventor 郑伟高雅
Owner KUNMING UNIV OF SCI & TECH
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