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Micro-nano dust sampler efficiency assessment method

A sampler, micro-nano technology, applied in sampling devices and other directions, can solve problems such as serious dependence, and achieve the effect of good objectivity and accuracy

Inactive Publication Date: 2011-08-10
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the efficiency of a micro-nano dust sampler, to solve the serious dependence of the existing dust instrument efficiency evaluation on other similar instruments or to accurately grasp the influence of dust concentration in the environment, to realize the dust sampler, Especially for fast, accurate and independent and reliable assessment of the efficiency of nano-dust samplers

Method used

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  • Micro-nano dust sampler efficiency assessment method

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Two wet nano-dust samplers produced in the same batch (NDS-1 type, Nanjing University of Science and Technology) were connected in series, and 800ml of distilled water was added to the two instruments as the trapping liquid. Set the same collection parameters according to the instrument manual, collect dust at about 1.0m near the packaging port of the nano-titanium dioxide production line for 4.0h (product particle size is 20nm-80nm), and the sampling height is 1.5m. The captured liquids in the two instruments were respectively taken, and the concentration of titanium dioxide was analyzed by plasma emission spectrometer (ICP), and the mass concentrations of titanium dioxide in the captured liquids of the two instruments were obtained as w 1 = 40.86ppm and w 2 = 1.26ppm. According to the formula 2 provided by the invention, the collection efficiency of the instrument to nano titanium dioxide dust is 96.92%.

[0067] In addition, the mass concentration of nano-titanium ...

Embodiment 2

[0069] According to the instrument manual, the collection membrane was installed in two dry nano-dust samplers of the same model (NanoMOUDI-125B, MSP, USA), and the two instruments were connected in series according to the schematic diagram in Figure 1. Set the same collection parameters, place the sampling head of the combined instrument at a distance of 5.0m from the packaging port of the nano-titanium dioxide production line, and collect nano-dust for 4.0h (product particle size is 20nm-80nm). In strict accordance with the instrument instructions, use electronic balances to weigh the mass of nano-dust collected by the two instruments in m 1 = 12.3 mg and m 2 = 1.2 mg. According to the formula 1 provided by the invention, the collection efficiency of the instrument for the nano titanium dioxide dust is 90.24%. According to the collection efficiency curve provided by the instrument company (corrected by the DMA method), the dust collection efficiency of the instrument in th...

Embodiment 3

[0071] Connect two respirable dust samplers of the same model (TMP-1500B, Yancheng Kebo Electronic Instrument Co., Ltd.) in series according to Figure 1, and set the same collection parameters according to the instrument manual. Place the sampling head of the combined instrument at a distance of 1.0m from the packaging port of the superfine pulverization production line of ultrafine silica (the product particle size is 2μm-15μm), and collect nano dust for 10min. Measure the mass of dust collected by the two instruments separately as m 1 = 32.6 mg and m 2 = 1.7mg. According to the formula 1 provided by the invention, it is obtained that the collection efficiency of the instrument for micron silica dust is 94.78%. At the same time, it is detected that the inlet gas pressure of the series connected sampler is 101.3kPa, and the outlet pressure is 99.8kPa.

[0072] What is listed in the embodiment is that two micro-nano dust samplers of the same type are connected in series. In a...

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Abstract

The invention discloses a micro-nano dust sampler efficiency assessment method, which comprises following steps: the first step includes serially connecting n micro-nano dust samplers with identical models, the second step includes setting identical acquisition parameters for the serially connected micro-nano dust samplers and placing a sampling head of the first micro-nano dust sampler into an air environment containing micro-nano dust to begin to acquire micro-nano dust, the third step includes closing the micro-nano dust samplers after completing acquisition of the micro-nano dust and accurately detecting quality or quality concentration of the acquired micro-nano dust in the micro-nano dust samplers, and the fourth step includes calculating to obtain acquisition efficient according toa calculation formula. The micro-nano dust sampler efficiency assessment method resolves problems that efficiency assessment of the existing dust instrument has severe dependence to other similar instruments or is necessary to accurately master influence of dust concentration in an environment, and realizes fast, accurate, independent and reliable assessment for efficiency of dust samplers and particularly efficiency of nano dust samplers.

Description

technical field [0001] The invention belongs to a method for evaluating the efficiency of a micronano dust sampler, in particular to a method for evaluating the efficiency of a micron, submicron and nanometer dust (aerosol) sampler with an air pump as the sampling power. Background technique [0002] At present, the principle of measuring the efficiency of the micron dust sampler in the air environment at home and abroad is: firstly, the monodisperse dust is compressed into a tablet, and the brush of the monodisperse aerosol generator is used to quantitatively spray the dust compressed tablet, and then in a limited space. The collection of dust is carried out, and the collection efficiency of the instrument (the ratio of the collection volume to the injection volume) is obtained by measuring the amount of sprayed dust and the amount of collected dust. Since the nano-powder is compressed into a tablet and sprayed with a brush, it is difficult to ensure that the sprayed dust i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/14
Inventor 杨毅陈守文王正萍张晋华李凤生周先国沈才萍
Owner NANJING UNIV OF SCI & TECH