共查询到18条相似文献,搜索用时 234 毫秒
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气相色谱-质谱联用检测塑料产品中溴化阻燃剂 总被引:2,自引:1,他引:1
建立了气相色谱-质谱联用测定塑料产品中多溴联苯和多溴联苯醚的方法.以甲苯为提取溶剂,超声提取电子电气产品中多溴联苯(PBBs)和多溴联苯醚 (PBDEs),采用气相色谱-质谱法(GC-MS)检测.SCAN和SIM同时扫描,采用质谱特征离子定量分析.结果表明: 9种多溴联苯(PBBs)和10种多溴联苯醚(PBDEs)的线性关系、检出限、回收率和精密度都较好,RSD均<5.0%,PBBs回收率在97%~111%之间;PBDEs回收率在82%~115%之间.本方法前处理简便,灵敏度高,定性、定量分析准确可靠,且分析时间短,适用于塑料产品中PBBs和PBDEs的测定. 相似文献
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为了研究贵阳市红枫湖底栖生物体中多溴联苯醚(polybrominateddiphenyl ethers,PBDEs)的污染情况,通过索氏抽提、凝胶色谱柱和多层硅胶/氧化铝层析柱净化,对红枫湖底栖生物体中PBDEs的含量、分布模式、来源进行分析。结果表明,红枫湖样品中Σ18PBDEs为105.71~43902.73 pg/g(干重),各单体含量为1.05~20045.38 pg/g。红枫湖底栖生物体中PBDEs的污染尚处于较低水平。 相似文献
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多溴联苯醚(PBDEs)是一类新型的持久性有机污染物(POPs),由于不合理的使用和处置,在多种环境介质中均存在不同程度的污染。环境中PBDEs的降解技术已成为近年来的研究热点。大量的研究表明,零价铁(ZVI)还原脱溴降解PBDEs是一种高效快速且经济可行的治理技术。本文在总结国内外关于ZVI基材料降解PBDEs研究的基础上,分析了ZVI还原降解PBDEs的机理、动力学、影响因素及降解路径。从总体上看,ZVI作为高活性电子供体虽然能将高溴代PBDEs迅速降解为低溴代产物,但产生的低溴代PBDEs往往具有更大的环境风险,需进一步降解处理。近年来的研究表明,利用ZVI作为间接电子供体,通过催化活化H_2O_2或过硫酸盐产生高活性自由基,能够实现开环降解低溴代PBDEs。基于以上分析,通过构建一套先还原-后氧化的降解体系,有望实现高溴代PBDEs的彻底降解。最后,本文对ZVI降解PBDEs技术的后续研究进行了讨论和展望。 相似文献
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环境样品中多溴联苯醚分析方法的研究进展 总被引:1,自引:0,他引:1
《化学研究》2015,(4)
多溴联苯醚(PBDEs)作为一类应用广泛的溴代阻燃剂,具有持久污染性、易于从被应用产品中脱离出来进入环境介质等特性,目前已对全球环境造成了严重危害.近年来针对PBDEs分析检测技术的报道愈来愈多,然而PBDEs不仅含量极低,而且所处基体复杂,因此样品前处理技术成为分析PBDEs类化合物的一个重要步骤,受到科学工作者的广泛重视.本文作者综述了近年来分析环境样品中PBDEs的样品前处理技术和分析检测方法的研究进展,为更好的发展准确、灵敏、快速的分析方法提供重要的参考. 相似文献
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Polybrominated diphenyl ethers (PBDEs), a class of brominated flame retardants, have gained the attention of many researchers due to their persistence in various environmental matrices. Their usage in numerous consumer products has lent credence to their ability to retard flammable gas formation and brought attention to their ubiquitous occurrence in the environment. PBDEs have been described as endocrine-disrupting chemicals because of their interference with the endocrine system in aquatic and terrestrial animals. In spite of the progress in research over the decades on PBDEs, a full understanding of the environmental behavior and fate of this contaminant is still elusive. Therefore, terrestrial contamination of PBDEs has been evaluated in conjunction with their levels of toxicity, transformation, and transport in various environmental compartments. This review provides a wider perspective of the behavior of PBDEs in the terrestrial environment. Through examining the numerous studies on the environmental contamination of PBDEs, a number of mounting concerns and data gaps have been identified. Numerous methodologies have been discussed including adsorption, catalytic, photocatalytic, electrocatalytic, photo-electrocatalytic, aerobic, and anaerobic degradation. The comparative PBDE degradation analysis suggests that the oxidative degradation pathway is the most appropriate way of wastewater treatment while the role of other soil ingredients on subsurface treatments is still under investigation. 相似文献
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Domingo JL 《Journal of chromatography. A》2004,1054(1-2):321-326
Polybrominated diphenyl ethers (PBDEs), a class of brominated flame retardants, are used in a variety of consumer products being produced in notable quantities. PBDEs have been detected in environmental samples. In recent years, a marked increase in the levels of PBDEs in human biological tissues and fluids, especially breast milk, has been observed in some countries. As for other persistent organic pollutants (POPs), dietary intake is very probably the main route of exposure to PBDEs for the general population. This paper reviews the state of the science regarding human exposure to PBDEs through the diet. Because of the scarce information about it, it is concluded that studies focused on determining PBDE exposure for the population of a number of countries are clearly required. The correlation of PBDE body burdens and dietary intake of PBDEs are also necessary. 相似文献
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Polybrominated diphenyl ethers (PBDEs) are a group of persistent organic pollutants. They are used as flame retardants in plastics, paints, varnishes and textile materials. PBDEs pose great risk to the environment because of their high persistence and ability to get into the environment easily due to the lack of chemical bonds with the matrix of materials, to which they are added. Global research studies confirmed the occurrence of those compounds in the majority of elements of water and land environment. Analysis of PBDEs in environmental samples is one of the specific analytical methods of criteria that comprise low detection limits and high selectivity. The analysis of PBDEs in environmental samples is one of the specific analytical methods, in which the main criteria are low detection limits and high selectivity. In this article, a literature review of methods for environmental sample preparation and analysis of the PBDE content was presented. The article discusses the potential of modern extraction techniques such as: solid-phase microextraction, single-drop microextraction, dispersive liquid-liquid microextraction, microwave-assisted extraction, cloud point extraction, hollow fibre-liquid phase microextraction and others for the separation of PBDEs from environmental samples with a complex matrix. Among the methods for qualitative and quantitative determination of PBDEs, a particular focus was put on gas chromatography/mass spectrometry with various injection techniques and different types of sample ionisation. 相似文献
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This paper gives an overview on the determination of PBDEs in biological tissues, such as human blood and milk, cow’s milk and fish with special emphasis on quality control and assurance measures which are mandatory and a prerequisite for a reliable determination of environmental pollutants at trace levels. First experiences in the determination of PBDEs have been gained nearly 20 years ago. Due to great progress in the development of analytical instrumentation, the applied GC/MS methods resulted in very low detection limits. Furthermore, because of unexpected findings in biological tissues, the determination of PBDEs became of growing importance in the past few years. The analysis of hundreds of samples demonstrated the need for extensive quality control/quality assurance (QC/QA) measures which will be reported in detail in the following. 相似文献
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SHE JianWen SHE YiFan &SONG WenLu Biochemistry Section Environmental Health Laboratory Branch California 《中国科学:化学》2010,(5)
In an effort to investigate the status of human exposure to PBDEs in China,available monitoring data in human specimens(including breast milk,serums,and blood) was collected from the general population as well as specific groups that are occupationally exposed.PBDEs exposure profiles and concentration levels were compared with their counterparts in the United States of America.It was found that PBDE burdens in general Chinese population are one order lower and have different congener profiles from that in t... 相似文献
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Determination of polybrominated diphenyl ethers (PBDEs) in environmental samples has raised great concerns due to the widespread use of PBDEs and their potential risk to humans. Solid-phase microextraction (SPME) is a fast, simple, cost-effective, and green sample preparation technique and is widely used for environmental analysis, but reports on the application of SPME for determination of PBDEs are very limited, and only a few publications dealing with commercial SPME fibers are available for extraction of PBDEs. Herein, we report a novel SPME method using multiwalled carbon nanotubes (MWCNTs) as the SPME fiber coating for gas chromatography with electron-capture detection (GC-ECD) of PBDEs in environmental samples. The MWCNTs coating gave much higher enhancement factors (616-1756) than poly (5% dibenzene-95% dimethylsiloxane) coating (139-384) and activated carbon coating (193-423). Thirty-minute extraction of 10 mL of sample solution using the MWCNTs coated fiber for GC-ECD determination yielded the limits of detection of 3.6-8.6 ng L(-1) and exhibited good linearity of the calibration functions (r(2)>0.995). The precision (RSD%, n=4) for peak area and retention time at the 500 ng L(-1) level was 6.9-8.8% and 0.6-0.9%, respectively. The developed method was successfully applied for the analysis of real samples including local river water, wastewater, and milk samples. The recovery of the PBDEs at 500 ng L(-1) spiked in these samples ranged from 90 to 119%. No PBDEs were detected in the river water and skimmed milk samples, whereas in the wastewater sample, 134-215 ng L(-1) of PBDEs were found. The PBDEs were detected in all whole fat milk samples, ranging from 13 to 484 ng L(-1). In a semiskimmed milk sample, only BDE-47 was found at 21 ng L(-1). 相似文献
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A column chromatography procedure was developed for the clean-up of solvent-extracted sediment samples for the fractionation of polybrominated diphenyl ethers (PBDEs) and polybrominated dibenzo-p-dioxins and dibenzofurans (PBDD/Fs). The procedure included multiple column chromatography steps for clean-up for the separation of PBDEs from PBDD/Fs. The separation of the two chemical groups overcame the mutual interfering problem during the GC-ion trap MS analysis. The method was validated with the analysis of quality control samples. The method accuracy represented with relative error was less than 16% for all targeted PBDEs and PBDD/Fs congeners. Recoveries of the 13C-labeled standards ranged from 64% to 117% with relative standard deviation from 7.3% to 15%. Results from the analysis of environmental sediment samples collected in the vicinity of a recycling site for electronic wastes showed high levels of PBDEs (1.5-12 ng/g, dry weight), trace levels of PBDFs (0.025-0.92 ng/g, dry weight) and non-detectable PBDDs. 相似文献