Method for calculating atmospheric biological particle concentration
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A technology of biological particles and calculation methods, applied in the field of agricultural ecosystem research, can solve the problems of low natural collection efficiency, achieve high accuracy, good stability, and improve accuracy and reliability
Active Publication Date: 2018-01-09
CHONGQING JIAOTONG UNIVERSITY
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This is because the circumference of the slide area closer to the rotation axis is smaller, the fanned air volume is smaller, and the air contact is less, so the chance of contact with air particles is less, and the natural collection efficiency will be low.
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[0035] In other embodiments, other values in the range of 18-21 mm from the outer edge of the glass slide can also be selected, such as 19 mm, 20 mm, and 21 mm, so as to achieve the same technical effect.
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[0036] In other embodiments, other values in the range of 0.81-0.85 mm may also be selected for the width of the counting area, such as 0.81 mm, 0.82 mm, 0.84 mm, and 0.85 mm, so as to achieve the same technical effect.
[0037] In step 4), calculate the concentration of biological particles in the atmosphere according to the following formula:
[0038]
[0039] Wherein, Ni is the number of biological particles in the calculation area on the first to fourth slides;
[0040] s is the sampling area of each sampling slide;
[0041] RS is the rotation speed of the linkage shaft, the unit is r / s;
[0042] Δt is the sampling time.
[0043] Taking pollen sampling in the air as an example, set the sampling time Δt as 2h=7200s;
[0044] s=0.83*25*10 -6
[0045] After observation, the Ni values on slides 7, 8, 9, and 10 are 14, 16, 8, and 13 respectively;
[0046] The rotation speed of RS is set to 27.2 rev / s;
[0047] The calculated concentration C of biological particl...
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Abstract
The invention discloses a method for calculating atmospheric biological particle concentration. The method comprises the following steps: (1) installing a biological particle sampling device; (2) sampling biological particles in the air within a period of time delta t; (3) carrying out statistics on the number of the biological particles on a collected slide in the sampling device; (4) calculatingthe atmospheric biological particle concentration. The biological particle sampling device installed in the step (1) comprises a rotary drive seat (1); a driving motor (2) is arranged on the rotary drive seat (1), a linkage shaft (3) is arranged on the driving motor (2), and a biological particle collecting part (4) is arranged at the upper end of the linkage shaft (3). The new method for calculating the atmospheric biological particle concentration, provided by the invention, realizes the accurate calculation of the atmospheric biological particle concentration by means of the specific improvement on the conventional collecting device and counting area, thus improving the accuracy and reliability of the conventional atmospheric biological particle calculation.
Description
technical field [0001] The invention relates to the field of agricultural ecological system research, in particular to a method for calculating the concentration of atmospheric biological particles. Background technique [0002] At present, there are two basic methods to calculate the concentration of atmospheric biological particles in the atmosphere through sampling. One is the gravity sedimentation method, which installs collection slides and other devices on the surface to collect biological particles deposited on landmarks due to gravity. The investigation of pollen and other biological particles by gravity sedimentation method has been carried out for decades, and valuable research data have also been accumulated. This method is simple and easy to implement, but still has obvious deficiencies. Pollen and other biological particles are small in diameter, low in mass, and almost negligible in weight. They float in the air and spread with the wind. Therefore, the charac...
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