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Method using single point adsorption method to measure specific surface area of atmospheric particulates

A technology of atmospheric particles and specific surface area, applied in the analysis of materials, instruments, etc., can solve the problems of uncertain adsorption mode and complex structure of methylene blue, and achieve the effects of low cost, strong operability and simple process

Inactive Publication Date: 2016-09-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For atmospheric particulate matter, due to its complex structure, the adsorption method of methylene blue is currently uncertain

Method used

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  • Method using single point adsorption method to measure specific surface area of atmospheric particulates
  • Method using single point adsorption method to measure specific surface area of atmospheric particulates
  • Method using single point adsorption method to measure specific surface area of atmospheric particulates

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Embodiment 1

[0049] A method for measuring the specific surface area of ​​atmospheric particles using a single-point adsorption method, using a methylene blue aqueous solution to measure the specific surface area of ​​small-sized atmospheric particles collected by a single-point adsorption method, comprising the following steps:

[0050] 1) Collect atmospheric particulate matter, cut it into pieces and weigh it

[0051] Use the atmospheric particle sampler (JMT-3 type aerosol particle size distribution sampler) to collect continuously for 24 hours, the flow rate of the sampler is 28.3L / min, the sampling filter membrane is a glass fiber filter membrane, and the filter membrane is wrapped with tinfoil before sample collection. Burn in a muffle furnace at 450°C for 4h. After sample collection, store the filter membrane in a 4°C refrigerator. One ten-thousandth of the analytical balance weighs, and subtracts the mass before sampling from the mass after sampling to obtain the mass of atmospheri...

Embodiment 2

[0069] A method for measuring the specific surface area of ​​atmospheric particulate matter by using a single-point adsorption method, using a single-point adsorption method in an aqueous solution of methylene blue to measure the specific surface area of ​​the collected large-diameter atmospheric particulate matter, and the implementation steps are basically the same as in Example 1 ,The difference is:

[0070] In step 3), the ultrasonic time is 2.5 h, the shaking time is 1.5 h, and the shaking speed is 120 r / min; the solution is passed through a filter membrane with a pore size of 0.45 μm to remove residues in the solution.

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Abstract

The invention discloses a method using a single point adsorption method to measure the specific surface area of atmospheric particulates. The single point adsorption method utilizes a methylene blue water solution and comprises the following steps: (1) collecting atmospheric particulates, cutting, and weighing; (2) preparing a diluted original solution of methylene blue and a standard solution, determining the absorbance of standard solution, and drawing a work curve; (3) determining the absorbance of methylene blue solution, and calculating the adsorption amount of methylene blue according to the work curve; (4) calculating the specific surface area of atmospheric particulates. The method is simple, feasible, fast, and convenient, is suitable for measuring the surface area of atmospheric particulates, and has the characteristics of simple technology, low cost, strong operability, and low instrument requirements.

Description

technical field [0001] The invention belongs to the field of atmospheric environment, and in particular relates to a method for measuring the specific surface area of ​​atmospheric particles by using a single-point adsorption method. Background technique [0002] Specific surface area is an important parameter in the study of atmospheric particulate matter as an environmental pollutant in environmental toxicology. Therefore, it is very important to accurately characterize the specific surface area of ​​atmospheric particulate matter. There are many methods for measuring the specific surface area, commonly used are BET low-temperature adsorption method, electron microscopy and gas chromatography, etc., but these methods require complex devices or take a long time. The specific surface area analyzer commonly used in experimental detection has high requirements for the detection samples, and the atmospheric particles attached to the filter membrane do not meet the detection con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
CPCG01N15/00
Inventor 付铠周启星胡献刚
Owner NANKAI UNIV
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