Dust reduction cylinder bracket anti-corrosion bracket dust collection cylinder special boxProvided by Shanghai Shupei Experimental Equipment Co., Ltd., the materials include stainless steel and anti-corrosion spray coating, which meet the requirements for use with dust reduction tanks.

Dust reduction cylinder bracket anti-corrosion bracket dust collection cylinder special boxIntroduction:

The bracket for the dust reduction cylinder is made of stainless steel material and is used in conjunction with the dust reduction cylinder. The price is 150 yuan

The bracket of the dual cylinder dust reduction cylinder is made of stainless steel material, which can simultaneously place dual cylinder sampling and be firmly fixed with heavy objects such as cement pillars. After placing the cylinder, the distance between the cylinder mouth and the ground is 1-1.5 meters. Price: 360 yuan

The dedicated box for the dust reduction cylinder and the matching box for the dust reduction cylinder are designed with dual cylinders, made of aluminum alloy material, and equipped with shock-absorbing cotton. Price: 380 yuan

Dust reduction cylinder bracket anti-corrosion bracket dust collection cylinder special boxStandard:

National standard size inner diameter: 15 ± 0.2cm

Height: 30 ± 0.4cm

Weight: not exceeding 1.5kg

It is divided into three materials: PVC dust reduction tank, organic glass dust reduction tank, and glass dust reduction tank, which are convenient for dust reduction, acid rain component analysis, acid and alkali resistance, and good stability performance.

This dust collection tank is suitable for environmental monitoring, hygiene monitoring, sampling of atmospheric dust and acid rain, as well as for any analysis, testing, laboratory waste liquid tank, and storage of cleaning liquids.

The basic content of dust monitoring:

1Introduction

Dust reduction reflects the natural settling amount of particulate matter, expressed as the weight of particulate matter settled per unit area per month (unit: t/km2 · month).

It settles quickly in the air, making it difficult to inhale into the respiratory tract. Its natural settling capacity mainly depends on its own weight and particle size. It is one of the main indicators reflecting atmospheric dust pollution.

Dust reduction can easily lead to land desertification.

2determine

Topic content and scope of application

2. 1 Theme Content

This standard specifies the method for determining dust reduction. This standard uses ethylene glycol aqueous solution as the wet sampling method for collecting liquid, and uses the weight method to determine the dust reduction in the ambient air.

2. 2 Scope of application

This standard is applicable to the determination of particulate matter that can settle in ambient air. The detection limit of the method is 0.2t/km2 · 30d.

3.definition

Atmospheric dustfall: Atmospheric dustfall refers to particulate matter that naturally settles in a dust collection tank by gravity under atmospheric environmental conditions.

principle

The particulate matter that can settle in the air settles in a dust collection tank containing an ethylene glycol aqueous solution as the collection liquid. After evaporation, drying, and weighing, the dust reduction amount is calculated.

4.Reagent

Unless otherwise specified, the reagents used in this standard are recognized analytical grade reagents and distilled water or water of equivalent purity.

Ethylene glycol (C2H6O2).

5Instrument

51. Dust collection cylinder, cylindrical glass cylinder with an inner diameter of 15 ± 0.5cm and a height of 30cm. The bottom of the cylinder should be flat.

5. 2 100mL ceramic crucible. 5.3 Electric heating plate, 2000W.

5. 4 enamel plates.

5Analytical balance with a sensitivity of 0.1mg.

6Setting of sampling points and collection of samples

6Setting of Sampling Points

6Before sampling, it is necessary to first select the sampling points. When selecting sampling points, consideration should be given to the areas where the dust collection cylinder is not easily damaged, as well as the ease with which the operator can replace the dust collection cylinder. Ordinary sampling points are usually located on the roofs of low rise buildings or, as needed, on utility poles.

61.2 There should be no tall buildings near the sampling point, and avoid 6.1.3. The height of the dust collection tank should be 5-12m above the ground. In a certain region, the placement height of dust collection tanks at each sampling point should be kept at approximately the same height. If placed on a rooftop platform, the sampling port should be 1-1.5m away from the platform to avoid the impact of platform dust.

6The bracket of the dust collection tank should be stable and sturdy to prevent it from being blown over or swaying by the wind.

61.5 Set up control points in the cleaning area.

6Collection of Samples

62.1 Preparation before releasing the cylinder

Before placing the dust collection tank at the sampling point, add 60-80mL of ethylene glycol to fill the bottom of the tank. The amount of water added depends on the local climate conditions. For example, add 50mL in winter and summer, and 100-200mL in other seasons. After adding it, cover it with a plastic bag until the cylinder is placed on the fixed bracket of the sampling point, then remove the plastic bag and start collecting samples. Record the location, cylinder number, and time (year, month, day, hour) of the cylinder release.

Note: Adding ethylene glycol aqueous solution can prevent freezing, keep the bottom of the tank moist, and inhibit the growth of microorganisms and algae.

62.2 Sample Collection

Regularly replace the dust collection cylinder once a month (30 ± 2d). When retrieving the cylinder, the location and cylinder number should be checked, and the retrieval time (month, day, hour) should be recorded. Cover it with a plastic bag and bring it back to the laboratory. The time for replacing the cylinder is set to be completed within 5 days by the end of the month. During the rainy season in summer, attention should be paid to the accumulation of water in the tank. In order to prevent overflow, a new tank should be replaced in a timely manner, and the collected samples should be combined and measured.

7Analysis steps

7Preparation of porcelain orange pot

Wash and label 100mL of porcelain crucible, dry it in an oven at 105 ± 5 ℃ for 3 hours, take it out and place it in a dryer, cool it for 50 minutes, weigh it on an analytical balance, dry it for another 50 minutes, cool it for another 50 minutes, and weigh it again until it reaches a constant weight (the difference between the two weights is less than 0.4mg). This value is W0. Then burn it at 600 ℃ for 2 hours, take it out when the furnace temperature drops below 300 ℃, place it in a dryer, and cool it for 50 minutes. weigh. Burn at 600 ℃ for 1 hour, cool, weigh until constant weight, and this value is Wb.

7Determination of total dust reduction amount

Firstly, measure the inner diameter of the dust collection cylinder with a ruler (at least three points should be measured in different directions, and the arithmetic mean should be taken). Then, use smooth tweezers to remove foreign objects such as leaves and insects that have fallen into the cylinder, and rinse off the small dust particles attached to it with water before throwing it away. Use a sedimentation brush to clean the cylinder wall, transfer all the solution and dust particles in the cylinder to a 500mL beaker, evaporate them on an electric heating plate, and concentrate the volume to 10-20mL. After cooling, rinse the cup wall with water, and use a sedimentation brush to clean the dust particles on the cup wall. Transfer all the solution and dust particles to a 100mL porcelain crucible with a constant weight, place it in a enamel plate, and carefully evaporate them on an electric heating plate. Dry to dryness (be careful not to splash when the solution is low), then put it into an oven and dry it at 105 ± 5 ℃. Weigh it to constant weight according to the above method. This value is W1. Note: A starch broom is made by placing a small piece of latex tube on one end of a glass rod, clamping it with a hemostatic clip, and placing it in an oven at 105 ± 5 ℃ for 3 hours to bond the latex tubes together. The non bonded part is cut off to remove dust particles.

7Determination of combustibles in the total amount of dust reduction

73.1 Place the ceramic crucible with the measured total dust reduction amount into a muffle furnace, burn it at 600 ℃ for 3 hours, and take it out when the furnace temperature drops below 300 ℃. Place it in a dryer, cool it for 50 minutes, and weigh it. Burn at 600 ℃ for 1 hour, cool, weigh until constant weight, and this value is W2.

73.2 Place an equal amount of ethylene glycol aqueous solution as the sampling operation into a 500mL beaker, evaporate and concentrate it on an electric heating plate to 10-20mL, then transfer it to a constant weight ceramic crucible, place the ceramic crucible in an enamel dish, evaporate it on an electric heating plate until dry, dry it at 105 ± 5 ℃, weigh it to constant weight according to 7.1, and subtract the weight of the ceramic crucible W0 to obtain W0. Then put it into a muffle furnace and burn it at 600 ℃. Weigh it according to section 7.1 until it reaches a constant weight, and subtract the weight Wb of the porcelain crucible to obtain Wd. The ethylene glycol aqueous solution used for measuring W0 and Wd should be from the same batch as the ethylene glycol aqueous solution added to the dust collector.

8Expression of Results

Dust reduction refers to the mass of particulate matter that settles from the atmosphere per unit area and unit time. The unit of measurement is the tonnage of particulate matter deposited per square kilometer per month (i.e. t/km2 · 30d).

81 Calculation method

8Calculate the total amount of dust reduction according to equation (1):

In the formula: M - total amount of dust reduction, t/km2·30d

Wl——The weight of dust reduction, ceramic crucible, and ethylene glycol aqueous solution evaporated to dryness and kept constant at 105 ± 5 ℃, g

W0——The weight of the porcelain crucible dried at 105 ± 5 ℃, g；

Wc——The weight of an equal amount of ethylene glycol aqueous solution evaporated to dryness and kept constant at 105 ± 5 ℃ during the sampling operation, g

s——The area of the dust collection cylinder mouth, cm2

n——Sampling days, accurate to 0.1 days.

81.2 Combustible substances in dust reduction shall be calculated according to equation (2):

In the formula: M/- combustible material quantity, t/km2·30d

Wb——The weight of the porcelain crucible after being burned at 600 ℃, g

W2——The weight of the residue from dust reduction, porcelain crucible, and evaporation of ethylene glycol aqueous solution after calcination at 600 ℃, g

Wd——The weight of the evaporated residue of ethylene glycol water melt, which is equivalent to the sampling operation, after being burned at 600 ℃, g

s——The area of the dust collection cylinder mouth, cm2

n——Sampling days, accurate to 0.1d.

8Report Results

The result requires keeping one decimal place.

9.Precision and Accuracy

Five laboratories will distribute two unified samples, A and B.