echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Application of solid phase microextraction technology in solvent-based coating detection

    Application of solid phase microextraction technology in solvent-based coating detection

    • Last Update: 2020-12-29
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    China Coatings Online News
    Cai Jin'an, Ye Yuanjian, Cao Zhixiang (Guangzhou Quality Supervision and Inspection Research Institute, Guangzhou 510110)
    Summary: Solid Phase Micro-Extraction (SPME) technology is a new environmentally friendly sample pre-treatment method, the technology does not require extraction solvents, extraction, concentration, desorption, sampling and other functions in one, high sensitivity and easy to operate. This paper briefly introduces the principles and influence factors of SPME technology, summarizes the application status of SPME technology in the analysis of toxic and harmful substances in solvent-based coatings in recent years, and makes a comprehensive evaluation and outlook.
    key words: solid-phase micro-extraction; solvent-based coatings; Toxic and hazardous substances
    In the figure classification number: TQ630.7 plus 2 document identification code: A article number: 1006-2556 (2012) 09-0070-03
    0
    Solid Phase Micro-Extraction (SPME) is a new type of extraction phase miniaturized environmentally friendly pre-treatment technology, which abandons the traditional solvent extraction method of cumbersome operation steps and produces a large number of organic solvent secondary pollution, extraction, concentration, desorption, sampling and other functions in one. Solvent-based coatings are the main coating varieties in China, benzene, toluene, xylene, xylene and other toxic and harmful substances are conventional testing items in paint products, how to establish a simple, fast and efficient detection method has attracted much attention. This paper will focus on the new environmental protection solid phase micro-extraction technology used in solvent-based coatings toxic and harmful substances detection.
    1 solid-phase micro-extraction technology
    sample pre-treatment is the most time-consuming testing process, but also because of human factors in the operation process and easy to introduce errors. Traditional sample pre-treatment techniques include liquid extraction, Soch extraction, and accelerated solvent extraction.
    detection of toxic and harmful substances in solvent-based coating products, the pre-treatment method is the traditional liquid phase extraction method. Traditional treatment means need to use a large number of sample size and pollution of the environment solvents, but also low extraction and purification efficiency, high cost and potential harm to the human body, but also not easy to use with other analytical instruments and other shortcomings. In contrast, SPME technology shows the superior and efficient purification and rich effect of green environment protection.
    SPME pre-treatment technology was developed by the Bowliszyn team in 1989, using molten quartz fiber adsorption samples coated with adsorbents to achieve the purpose of extraction and concentration, and then through thermal analysis or solvent excision treatment of the test, so extraction coating is the key to SPME technology. SPME technology is simple to operate, no need to extract solvents, easy to achieve and chromatography, electrophoresis and other efficient separation detection means of automation and attention. Conventional SPME technology can be divided into immersion (DI-SPME) and overhead (HS-SPME). The former principle is that the object to be measured is distributed in the polymer fixed phase and the sample phase, and finally achieves equilibrium by diffusion, while the latter is to achieve three-phase balance between the fixed phase, the top air phase and the solution phase. Factors that affect its extraction effect: extraction coating, extraction time, pH, ion strength, temperature and time of thermal analysis, etc. SPME coating materials can be selected according to the nature of the extracted components, such as distribution coefficient, molecular weight (volatile), polarity, etc. Current commercial coatings have non-polar fixed phase polymethylsilane (PDMS), polar fixed phase polypropylene esters (PA), and composite coatings have polymethylsilane/diethylene benzene (PDMS/DVB), activated carbon/polydmethylsiloxane (CAR/PDMS). Properly changing the pH and increasing the ion strength in the solution can reduce the solubility of the organic matter under test in the water and improve the extraction rate. Different extraction temperatures can affect the diffusion and diffusion of the object to be measured, thus changing the distribution coefficient between the solid-phase coating and the sample substation. Therefore, the use of SPME technology can be optimized extraction conditions to achieve efficient extraction results.
    2 The application and research of solid phase micro-extraction technology in solvent-based coatings for harmful substances
    has been widely used in the building materials industry as an important basic chemical raw materials benzene, halogenated hydrocarbons, toluene isocyanate, etc., is an important threat to the health of construction workers, but also the main environmental pollutants. In GB 18581-2009 "Indoor decoration materials solvent-based wood coating in the limit of harmful substances", GB 18582-2008 "interior decoration materials in the interior wall paint in the limit of harmful substances" and other national mandatory standards, the use of pre-treatment methods are traditional liquid phase extraction. In JC-1066 "Limits of hazardous substances in building waterproof coatings" solvent-based building waterproof coating hazardous substances content, for benzene, phenol, phenol, radon detection using a new type of top-air (HS) system. HS system does not use solvents, only let the sample in the top empty bottle under certain conditions of balance, environmentally friendly. SpME extraction, however, is more selective. HS technology is for all volatile components, SPME can optimize the selection of SPME extraction coating according to the need to improve the extraction rate of the objects to be tested. SPME technology is undoubtedly superior to environmentally friendly pre-treatment technology.
    years, SPME technology has been successfully applied to the detection of volatile substances such as benzene products in solvent-based coatings. Bodrian and others, using a 65 m CW/DVB extraction coating, established and optimized conventional analytical methods for acetone, methyl acetate, and TEFDB in solvent-based coatings with HS-SPME-GC technology in conjunction with different detectors. In addition, the technology was successfully applied to test toluene, xylene and butyl acetate in solvent-based coatings and to verify the use of traditional extraction methods. Albert and others used SPME-GC-FID technology for the detection of volatile organic matter between C5-C11 in solvent-based coatings, and the results showed that the technology was beneficial to identify the parts of various volatile solvents in solvent-based coatings. If the extraction coating with PDMS is combined with the Carbowax column, the aromatic hydrocarbons and fatty hydrocarbons can be better separated, and if the extraction coating with Carbowax is combined with the Carbowax column, it is more conducive to the extraction of aromatic hydrocarbons and alcohols. Chen Zhuling and other methods of HS-SPME-GC were established to detect and analyze benzene products in interior decoration coatings, and the extraction coating of 100 smPDMS was used and optimized. The method has good linearity, the detection limit is 0.05 to 0.60 μg/L, and the relative standard deviation of repeated measurement is less than 2.3%, which proves that the sensitivity of the method is high and accurate.
    liquid as a new extraction medium and micro-extraction technology has become a new development trend. Because the ionic liquid structure can be designed and the extraction performance is highly efficient, Jiang and so on put forward the extraction coating of the Ionic liquid (C8MIM) (PF6) as the SPME, and applied it successfully to the benzene assay in the coating products, the new coating is comparable to the extraction effect of the traditional commercial coating, with good linear range and recovery rate. However, since the disposable use of ionic liquids avoids residues of the objects to be tested, the aging operation of SPME coatings can be avoided; Therefore, ionic liquid-SPME is more advantageous for the detection of toxic and harmful substances used in coatings.
    isocyanate harmful substances (TDI) in polyurethane coatings is GB18446-2009 "color paint and varnish paint isocyanate resin determination of isocyanate monomer" routine testing project, using the traditional liquid phase extraction method. With the increasing maturity of harmful substances such as benzene products in SPME-GC technology, the detection and research of SPME-rich TDI-type substances has also been promoted. Batle and others first used ditamine (DBA) to derive the extraction coating of 65 sm PDMS-DVB, then to extract gaseous 2,4-toluene diocyanate (2,4-TDI), and then connected online with LC-MSMS to determine the TDI-DBA resulting from the reaction on the extraction coating.
    the linear range of the method is good at 52.8 to 3 100 μg.m-3, and the detection limit of the method is 2 μg.m-3. Studies have shown that the derived PDMSDVB-DBA coating can be maintained steadily at least 10 d, which is very good for the development of iso-detection. The same applies to 2, 6-TDI or other types of TDI testing.
    addition, the use of SPME technology in the determination of volatile toxic and harmful substances, can effectively prevent non-volatile objects into the chromatography system, but also to improve the clean maintenance of the chromatography system. For coating products, the use of HS-SPMEGC joint technology to determine volatile toxic and harmful substances when this advantage is more obvious, the SPME can be solvent-free extraction performance, higher economic benefits.
    3 Comprehensive Evaluation and Outlook
    How to detect toxic and harmful substances in coatings efficiently and quickly is still an important part of daily supervision and inspection. The conventional method is to dilute the sample with organic solvent, directly in the gas chromatography sample analysis, the method uses a large amount of solvent, paint sample substation is more complex, its interference compounds easily enter the column, adversely affecting the separation. SPME technology can avoid the use of a large number of organic solvents harmful to the environment and human body, with simple operation, high label recovery rate, high sensitivity, green and other advantages. SPME has been implemented and automatic sampler or solvent deserator online connectivity, greatly reducing the time spent on pre-treatment and human error. However, the current commercial SPME extraction fiber coating type is not rich enough, its price is also higher. In addition, the use of SPME extraction fiber head may have residues to be tested, if used in the industry, the bulk aging treatment of the extraction fiber head sampling blank detection.
    believes that the development and research of new SPME coatings and new devices for the detection of toxic and harmful substances in solvent-based coatings will make the application of SPME technology in the daily detection of solvent-based coatings more promising. SpME is not used in the daily testing of solvent-based coatings. Only when the researchers use THE technology, do they have a deep understanding of the difficulties of analyzing this technology and seriously deal with the problems in daily detection and analysis, so that THE technology can better develop in the analysis of toxic and harmful substances of solvent-based coatings in China. However, it is worth affirming that solid phase micro-extraction technology provides an important method reference for improving the method of detecting toxic and harmful substances in paint products.
    : Slightly
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.