Method for measuring benzene series content in polypropylene tow filter rod
A determination method and polypropylene technology, applied in the field of chemical analysis, can solve the problems of not having a large water sample volume, affecting the extraction reproducibility, reducing the efficiency, etc., and achieving the effects of excellent measurement effect, low cost, and low solvent consumption.
Active Publication Date: 2013-12-25
HUBEI CHINA TOBACCO IND +1
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Problems solved by technology
[0003] 1) During the stirring process, a small amount of organic phase is easily dispersed or stuck to the tube wall under the pull of water, which not only affects the reproducibility of extraction but also reduces the efficiency;
[0004] 2) Due to the straight cylindrical shape, the device cannot have a large water sample volume, and the concentration is still low after enrichment;
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[0031]The specific implementation manners and related technical problems of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The method of the present invention is to ultrasonically extract the polypropylene tow filter stick in a certain amount of water, and then use the liquid-phase microscopic method of using 1-dodecanol (with 2-pentanone as the internal standard) as the extractant. After the extraction method is enriched, the concentration of benzene, toluene, ethylbenzene and xylene in the extract is determined by gas chromatography-mass spectrometry selected ion method, and then the concentration of benzene, toluene, ethylbenzene and xylene in the polypropylene tow filter rod is calculated. content. Unless otherwise specified in this application, all reagents used are chromatographically pure, and water is deionized water.
[0032] 1-Dodecanol (C 12 h 26 O, purity ≥ 99%); benzene (C 6 h 6 ,...
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The invention discloses a method for measuring benzene series content in a polypropylene tow filter rod and a special extraction apparatus, and belongs to the technical field of chemical analysis method. The method of the invention comprises the steps of: carrying out supersonic wave extraction on a polypropylene tow filter rod in a certain amount of water; enriching an extract with an extractant of 1-lauryl alcohol (using 2-pentanone as an internal standard substance) by a liquid phase micro-extraction method; measuring concentrations of benzene, toluene, ethylbenzene and xylene in the extract by a gas chromatography-mass spectrum selection ion method; and calculating contents of benzene, toluene, ethylbenzene and xylene in the polypropylene tow filter rod. The environment-friendly method of the invention has good determination effect and popularization and application value.
Description
technical field [0001] The invention belongs to the technical field of chemical analysis methods, and in particular relates to a new method and a special micro-extractor specially used for measuring the content of trace benzene series in polypropylene tow filter sticks. Background technique [0002] In the prior art, there is no method for measuring the content of benzene series in the polypropylene tow filter stick. In most cases, according to previous standards, the extraction method for the benzene series in the filter stick is to use n-pentane vibration extraction and The method is simple to operate by shaking and extracting with n-hexane. The applicant used n-pentane and n-hexane to use vibration extraction and ultrasonic extraction to compare and test the two methods, and found that when the content of benzene series was low, the organic solvent was used to extract and enrich the sample, and the organic solvent had a higher content of benzene series. However, the cont...
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IPC IPC(8): G01N30/72G01N1/28G01N1/34
Inventor 程占刚叶明樵王建新
Owner HUBEI CHINA TOBACCO IND