{"id":11097,"date":"2022-11-21T04:56:20","date_gmt":"2022-11-20T20:56:20","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=11097"},"modified":"2022-11-21T04:56:20","modified_gmt":"2022-11-20T20:56:20","slug":"zhakupbekova-arays-team-published-research-in-environmental-science-and-pollution-research-in-29-cas-930-36-9","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=11097","title":{"rendered":"Zhakupbekova, Aray&#8217;s team published research in Environmental Science and Pollution Research  in 29 | CAS: 930-36-9"},"content":{"rendered":"<p>Zhakupbekova, Aray published the artcile<b><i>Quantification of trace transformation products of rocket fuel unsymmetrical dimethylhydrazine in sand using vacuum-assisted headspace solid-phase microextraction<\/i><\/b>,  <a href=\"https:\/\/www.ambeed.com\/products\/930-36-9.html\">Formula: C4H6N2<\/a>,  the publication is  Environmental Science and Pollution Research (2022), 29(22), 33645-33656, database is CAplus and MEDLINE.<\/p>\n<p>Quantification of unsym. dimethylhydrazine transformation products in solid samples is an important stage in monitoring of environmental pollution caused by heavy rockets launches. The new method for simultaneous quantification of unsym. dimethylhydrazine transformation products in sand samples using vacuum-assisted headspace solid-phase microextraction without addition of water followed by gas chromatog.-mass spectrometry is proposed. Decreasing air evacuation time from 120 to 20 s at 23\u00b0C resulted in increased responses of analytes by 25-46% and allowed obtaining similar responses as after evacuation at -30\u00b0C. The best combination of responses of analytes and their relative standard deviations (RSDs) was achieved after air evacuation of a sample (m = 1.00 g) for 20 s at 23\u00b0C, incubation for 30 min at 40\u00b0C, and 30-min extraction at 40\u00b0C by Carboxen\/polydimethylsiloxane (Car\/PDMS) fiber. The method was validated in terms of linearity (R<sup>2<\/sup>=0.9912-0.9938), limits of detection (0.035 to 3.6 ng g<sup>-1<\/sup>), limits of quantification (0.12-12 ng g<sup>-1<\/sup>), recovery (84-97% with RSDs 1-11%), repeatability (RSDs 3-9%), and reproducibility (RSDs 7-11%). It has a number of major advantages over existing methods based on headspace solid-phase microextraction-lower detection limits, better accuracy and precision at similar or lower cost of sample preparation The developed method was successfully applied for studying losses of analytes from open vials with model sand spiked with unsym. dimethylhydrazine transformation products. It can be recommended for anal. of trace concentrations of unsym. dimethylhydrazine transformation products when studying their transformation, migration and distribution in contaminated sand.<\/p>\n<p>Environmental Science and Pollution Research published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C15H24BN3O2, <a href=\"https:\/\/www.ambeed.com\/products\/930-36-9.html\">Formula: C4H6N2<\/a>.<\/p>\n<p>Referemce:<br \/><a href=\"https:\/\/en.wikipedia.org\/wiki\/Pyrazole\">https:\/\/en.wikipedia.org\/wiki\/Pyrazole<\/a>,<br \/><a href=\"Pyrazole - Wikipedia\">Pyrazoles &#8211; an overview | ScienceDirect Topics<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Environmental Science and Pollution Research published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C15H24BN3O2, <a href=\"https:\/\/www.ambeed.com\/products\/930-36-9.html\">Formula: C4H6N2<\/a>.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[131],"tags":[784],"class_list":["post-11097","post","type-post","status-publish","format-standard","hentry","category-pyrazoles-derivatives","tag-m-w50-100"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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