共查询到19条相似文献,搜索用时 140 毫秒
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在国家“十五”攻关重大专项和国家重大科技专项的支持下,由中国疾病预防控制中心营养与食品安全所完成的“二恶英,多氯联苯和氯丙醇的痕量与超痕量检测技术研究”,不仅使我国的二恶英、多氯联苯和氯丙醇的超痕量检测技术通过了国际质量分析考核,而且使我国首次以起草国身份参与国际食品法典委员会(CAC)有关二恶英控制等国际标准的起草和制定工作。代表国家分析水平的二恶英及相关超痕量检测技术的建立, 相似文献
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二恶英类分析研究进展及展望 总被引:2,自引:0,他引:2
通过综合介绍国内外二恶英类物质分析研究的最新动态,包括二恶英类的前处理和气相色谱法(GC)、液相色谱法(LC)、胶束电动色谱法(MEKC)、质谱法(MS)、气相色谱/质谱(GC/MS)联用和生物分析法等多种分析技术及其改进方法,指出了二恶英类分析研究工作中现存的问题,对今后的发展动向提出了一些建议。 相似文献
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同位素稀释高分辨气相色谱-高分辨质谱法测定土壤样品中二恶英类化合物的等价毒性当量不确定度的评定 总被引:2,自引:0,他引:2
采用同位素稀释高分辨气相色谱-高分辨质谱法(isotope dilution high resolution gas chromatography and high resolution mass spectrometry,ID-HRGC-HRMS)测定土壤样品中二恶英类化合物(polychlorinated dibenzo-p-dioxins and dibenzofurans,PCDD/Fs)的等价毒性当量(toxic equivalent quantity,TEQ)。讨论并确定了测定土壤样品中二恶英类化合物2,3,7,8位异构体不确定度的来源并合成了各异构体的相对标准不确定度;在此基础上,计算了3种等价毒性当量因子(toxic equivalent factor,TEF)框架下土壤样品中PCDD/Fs的TEQ浓度及其合成不确定度和扩展不确定度。 相似文献
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1引言 虎杖为蓼科植物虎杖(Polygonum cuspidatum Sieb et Zucc.)的根茎。虎杖的主要有效成分是芪类(二苯乙烯类)化合物和葸醌类化合物。芪类化合物主要包括属多酚类的白藜芦醇及白藜芦醇苷(虎杖甙);葸醌类主要含大黄素、大黄素甲醚和大黄酚等。芪类和葸醌类化合物的测定方法有薄层扫描法、HPLC法、气相色谱法、电动毛细管色谱法和分光光度法等。其中分光光度法具有设备简单、操作方便等优点,因而易于推广使用。实验对芪类和蒽醌类化合物紫外吸收和可见吸收光谱进行了考察,发现这两类化合物的紫外吸收峰重叠严重。为了消除这一影响,通过改变pH等介质条件,可以使重叠谱峰分离,并采用导数分光来提高分辨率,实现了芪类化合物分光光度法的直接测定,并利用该碱性溶液在可见光谱区测定葸醌类化合物含量。 相似文献
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浙江大学新建成了二恶英实验室。据悉,该文验室是目前国内能源研究领域中唯一有能力进行伞面二恶英研究的测试分析的实验室,也是目前国内面积最大、功能最全、设计最合理、仪器配置水平最高的具有罔际水准超痕量二恶英分析实验室。该实验室的建成,提供了一个集能源、环保、化工及分析测试等多学科知识、技术交叉的多功能学术交流平台。这也是目前我国大陆地区唯一一家被联合同环境保护署(UNEP)列入其全球持久性有机污染物实验室目录的二恶英实验室。 相似文献
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城市生活垃圾焚烧产物中二噁英检测方法 总被引:2,自引:1,他引:2
为研究城市生活垃圾焚烧产生的二噁英污染检测问题,介绍了垃圾焚烧过程中二噁英类的生成机理及其检测方法。色谱法、免疫法、生物法、激光质谱法是目前检测二噁英类的主要手段,其中高分辨气相色谱-高分辨质谱(HRGC-HRMS)法、虫荧光素酶报告基因(CALUX)法及酶免役分析(EIA)法等在实践中取得了很好的检测效果,但各种方法适应范围有很大差别。色谱法可有效分离各种二噁英类成分,但对仪器精度和操作水平要求较高,测试周期较长,费用较高,适于准确对各种成分定量检测,不需计算总量的场合;生物法测试周期短,可平行测试大量样品,适于快速、大规模样品的筛选,但只能测定总毒性当量;激光质谱法具有高选择性、高灵敏度、多组分测定、可实现在线检测等优势,但需要预先了解污染物的光谱结构。 相似文献
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燃烧排放物中的有毒二噁碤及类二噁碤多氯联苯 总被引:2,自引:0,他引:2
本文评述了国内外对二噁碤的研究成果及动向,介绍了二噁碤中的有毒同族体及其毒性当量计算、准确的分析方法、燃烧过程中二噁碤的光降解行为及其降解产物、类二噁碤多氛联苯等内容,引述了90多篇最新的文献及有关图表。 相似文献
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Sylwia Oleszek‐Kudlak Etsuro Shibata Takashi Nakamura Xian‐Wei Li Yong‐Mei Yu Xiao‐Dan Dong 《中国化学会会志》2007,54(2):245-262
The analytical requirements for the determination of dioxins (e.g. PCDD, PCDF) are unique in comparison with those for other routinely monitored chemicals: dioxins are measured in parts per trillion (ppt) and lower levels in technical and environmental samples, whereas other organics are measured in parts per million (ppm) or parts per billion (ppb). The ultra‐trace analysis of dioxins requires a high sample enrichment obtainable by the use of efficient extraction methods and highly selective purification/fractionation techniques. Furthermore, highly sensitive equipment (e.g. high resolution gas chromatography ‐ HRGC) with detection levels in the ppt range must be used to isolate and separate a huge number of dioxin congeners. The quantification of the dioxins by a high resolution mass detector (HRMS) requires the use of internal and labeled standards. This paper reviews and compares the classic and modern pretreatment methods, namely extraction and clean‐up, that are currently used in dioxin analysis in industrial samples and that were improved or developed in the last 25 years. In addition, the standard methods for dioxin sampling from an emission source (flue or stack gas) are examined and compared with new, automated techniques. 相似文献
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二英类分析研究进展及展望 总被引:4,自引:0,他引:4
通过综合介绍国内外二英类物质分析研究的最新动态,包括二英类的前处理和气相色谱法(GC)、液相色谱法(LC)、胶束电动色谱法(MEKC)、质谱法(MS)、气相色谱/质谱(GC/MS)联用和生物分析法等多种分析技术及其改进方法,指出了二英类分析研究工作中现存的问题,对今后的发展动向提出了一些建议. 相似文献
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Marie-Louise Scippo Soledad Rybertt Gauthier Eppe Anne-Cécile Massart Edwin De Pauw Guy Maghuin-Rogister 《Accreditation and quality assurance》2006,11(1-2):38-43
In the determination of contaminants (dioxins, polychlorinated biphenyls, polyaromatic hydrocarbons), cell-based assays are
useful methods for screening purposes: they are mainly characterized by high sample throughput and lower costs than the Mass
Spectrometry (MS)-based methods.
Although cell-based assays can be sensitive enough for the determination of dioxins and related substances in agreement with
the presently tolerable limits in food and feed (Regulation No. 2375/2001/EC and Directive 2003/57/EC respectively), their
lack of specificity make their use rather questionable in control laboratories.
In this paper, we present and compare results obtained from the analysis of a limited number of feed samples by both gas chromatography-high
resolution mass spectrometry (GC-HRMS) and cell-based assay (DR-CALUX: dioxin responsive-chemically activated luciferase gene
expression) methods. The DR-CALUX screening led to less than 10% false non-compliant and no false compliant results. In addition,
there is a good correlation between GC-HRMS and DR-CALUX data. However, these preliminary results have to be confirmed on
a larger number of samples to demonstrate that total toxic equivalent (TEQ), including dioxins, furans and dioxin-like polychlorobiphenyls
(PCBs) can be monitored in feed and food with a cell-based assay.
Presented at AOAC Europe/Eurachem Symposium March 2005, Brussels, Belgium 相似文献
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Evaluation of an aqueous KOH digestion followed by hexane extraction for analysis of PCDD/Fs and dioxin-like PCBs in retailed fish 总被引:2,自引:0,他引:2
Tsutsumi T Amakura Y Sasaki K Toyoda M Maitani T 《Analytical and bioanalytical chemistry》2003,375(6):792-798
Aqueous KOH digestion followed by hexane extraction has been employed in the extraction of dioxins (polychlorinated dibenzo- p -dioxins, dibenzofurans and dioxin-like polychlorinated biphenyls) for biological samples, but there are no reports on its evaluation. Therefore, we report here the evaluation of this extraction for the analysis of dioxins in retailed fish. The effect of the alkaline digestion on dioxins was evaluated by estimation of recoveries. The recoveries of dioxins after the alkaline digestion were good (79-106%) in various kinds of retailed fish except tuna. In tuna, loss of octachlorodibenzofuran (OCDF) was clearly observed, however, the loss was corrected by internal-standard quantification; (13)C12-labeled OCDF was added before the alkaline digestion. Comparative study showed that alkaline digestion followed by hexane extraction provides extraction efficiencies of dioxins equal to those of conventional Soxhlet extraction in fish. Additionally, in analysis of a certified reference fish sample with this extraction, the values obtained for certified isomers were almost equal to the certified values. Since the present method is very simple and inexpensive, it would be useful for analysis of dioxins in retailed fish. 相似文献
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二噁(英)降解方法的研究 总被引:1,自引:0,他引:1
二噁(左口右英)是一类剧毒有机氯化物,已被联合国环境署和世界卫生组织列为持久性有机污染物和一级致癌物质,能够对环境和人类的健康造成重大危害.脱氯降解是降低二噁毒性的有效途径.本文对二噁的光降解、热降解、生物降解和化学降解脱氯作了详尽的评述,比较了各种降解方法的优劣,指出多相催化加氢脱氯降解方法将是今后的发展方向. 相似文献