共查询到18条相似文献,搜索用时 603 毫秒
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建立了液液萃取—气相色谱-质谱法快速测定丙烯酸生产废水中苯系物、酯类、醇类、醛类和酮类等12种半挥发性有机物的分析方法。液液萃取条件为:以二氯甲烷为萃取剂,废水pH 7,分散剂甲醇加入量10 mL/L,盐析剂NaCl加入量300 g/L。各组分的工作曲线的线性关系良好。各组分的加标回收率为95.2%~116.0%,各组分的方法检出限为0.001~0.179 μg/L,相对标准偏差均小于3.5%。该方法可用于丙烯酸生产废水中主要特征有机物的快速定量检测。 相似文献
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建立了固相微萃取种类与气相色谱联用测定地下水中12种硝基苯类化合物的分析方法,对萃取头种类、萃取时间、萃取温度、进样口衬管种类等分析条件进行了优化。实验结果表明,该方法的检出限为0.001~0.050 μg/L,线性范围0.005~500 μg/L(相关系数大于0.997),加标回收率为72.1%~122.0%,相对标准偏差为3.65%~12.60%。应用该方法对地下水及地表水样品进行分析,结果表明该方法具有环保、灵敏、快速、简便等特点,适用于水中痕量硝基苯、硝基甲苯类化合物和硝基氯苯类化合物的测定。 相似文献
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建立了气相色谱-质谱法(GC-MS)及硫化学发光检测气相色谱法(GC - SCD)定性和定量测定炼油厂二硫醚类恶臭污染物二甲二硫、乙基甲基二硫醚和二乙基二硫醚的方法.当进样体积为0.1mL时,GC - SCD法的二硫醚最低检出限为0.1~0.2 mg/m3,二甲二硫和乙基甲基二硫醚的RSD不超过2.4%(n=5),二甲... 相似文献
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建立了固相萃取—微波衍生化—气相色谱-质谱联用法快速同时测定水中雌酮(E1)、17α-雌二醇(α-E2)、17β-雌二醇(β-E2)、雌三醇(E3)、17α-乙炔基雌二醇(EE2)、双酚A(BPA)等6种雌激素物质的分析方法,对色谱柱升温程序、固相萃取及衍生化条件进行了优化。色谱柱最佳升温程序为:初始温度50 ℃,保持2 min;以20 ℃/min速率升至260 ℃,保持5 min;最后以10 ℃/min速率升至280 ℃,保持5 min。实验结果表明,在选取 HC-C18萃取小柱、添加双(三甲基硅烷基)三氟乙酰胺(BSTFA)+1%三甲基氯硅烷(TMCS)+吡啶作为衍生化试剂、微波315 W衍生化加热4 min的条件下,6种目标物标准曲线的相关系数均大于0.999,BPA、E1、EE2及E3的线性范围为3~300 ng/L,17α-E2及17β-E2的线性范围为5~300 ng/L,方法检出限为2.0~5.0 ng/L,加标回收率为76.45%~96.24%。 相似文献
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作者使用自行设计的V型浓缩器,以石油醚萃取浓缩浮选水中α-松油醇。整个分析操作中用正辛醇作内标物。在大量使用盐析剂的条件下,相比可达40,一次萃取收率达95%,实际富集比可达8000—20000倍。经浓缩富集的样品以热导气相色谱法定量。该方法的最低检测浓度为2ppb。在50ppb处的相对标准偏差为2—3%。 相似文献
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萃取浓缩-薄涂柱气相色谱法测定煤焦油废水中的联苯和菲 总被引:2,自引:0,他引:2
用苯萃取浓缩煤焦油废水中的联苯和菲,然后用薄涂柱气相色谱法进行测定。试验表明:该法具有色谱柱温低、快速、准确等特点。 相似文献
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Kleeberg KK Liu Y Jans M Schlegelmilch M Streese J Stegmann R 《Waste management (New York, N.Y.)》2005,25(9):872-879
A solid-phase microextraction (SPME) method has been developed for the extraction of odorous compounds from waste gas. The enriched compounds were characterized by gas chromatography-mass spectrometry (GC-MS) and gas chromatography followed by simultaneous flame ionization detection and olfactometry (GC-FID/O). Five different SPME fiber coatings were tested, and the carboxen/polydimethylsiloxane (CAR/PDMS) fiber showed the highest ability to extract odorous compounds from the waste gas. Furthermore, parameters such as exposure time, desorption temperature, and desorption time have been optimized. The SPME method was successfully used to characterize an odorous waste gas from a fat refinery prior to and after waste gas treatment in order to describe the treatment efficiency of the used laboratory scale plant which consisted of a bioscrubber/biofilter combination and an activated carbon adsorber. The developed method is a valuable approach to provide detailed information of waste gas composition and complements existing methods for the determination of odors. However, caution should be exercised if CAR/PDMS fibers are used for the quantification of odorous compounds in multi-component matrices like waste gas emissions since the relative affinity of each analyte was shown to differ according to the total amount of analytes present in the sample. 相似文献
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《Waste management (New York, N.Y.)》1999,19(2):181-188
Methods of toxicity-directed analysis have been developed for the characterization and identification of toxic organic constituents in industrial wastewater. Sequential solid-phase extraction is followed by high-performance liquid chromatography (HPLC) fractionation or by automated multiple development thin-layer chromatography fractionation (AMD–TLC) of the toxic extracts. Toxic fractions were finally analyzed by gas chromatography–mass spectroscopy (GC–MS). Toxicity was detected before each of the analytical steps by the bioluminescence inhibition of Vibrio fischeri, which was performed on microtiter plates and on the developed TLC plates. While sequential extraction broadens the polarity range of the procedure, the new variants of the luminescence test make the method very versatile and fast. The potential of this kind of toxicity-directed analysis with respect to resolution and polarity of analytes is discussed and applications to partial effluents of a tannery, to molasses wastewater and a spent dyeing bath are presented. A variety of benzothiazoles and more polar organics were identified as major toxic compounds in tannery effluents. It is shown that the procedures are well suited to detect individual toxic components in complex industrial wastewaters. The use of LC-MS is proposed to extend the polarity range of the final identification step. © 相似文献
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《Waste management (New York, N.Y.)》1999,19(2):111-123
Up to now comprehensive examination and assessment of the elimination behaviour of many different pollutants in biological waste water treatment failed above all because of limited possibilities to pursue polar organic compounds of anthropogenic and biogenic origin. In this case the behaviour of waste water constituents during the treatment of waste water from the pharmaceutical industry was studied with the help of mass-spectrometric detection (MS). After completest possible extraction and concentration by liquid/liquid and solid phase extraction (SPE) from samples of influent and effluent of a pilot plant, substance-specific determination and identification was done after chromatographic separation and with the help of mixture analysis, respectively. Separation by gas chromatography coupled with MS was applied to pursue the organic compounds, which are volatile without decomposition, during the waste water treatment process. Flow injection analysis (FIA) bypassing the analytical column combined with soft-ionizing interfaces served for screening of the polar compounds. Then they were separated by liquid chromatographic methods to recognize changes in the qualitative and quantitative compound spectrum. Mixture analysis by FIA combined with tandem mass spectrometry (FIA/MS/MS) was used for identification of the pollutants without previous chromatographic separation. A laboratory-made daughter ion library helped to identify some of the poorly eliminable pollutants detected. The presentation of the monitoring procedures applied was made in such a way that the treatment results were visually recognizable. Due to the use of time-saving FIA/MS, this method may serve for substance-specific monitoring of the treatment of possibly problematic waste waters. © 相似文献
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《Waste management (New York, N.Y.)》1999,19(2):171-180
A new methodology is described for the development of on-line measurements of selected hazardous polar pollutants in waste water. The on-line automated system consists of a selective solid-phase extraction in order to isolate, concentrate and clean up industrial waste water in one step followed by liquid chromatography and diode array or mass spectrometry detection. The new solid-phase extraction sorbents involve antigen–antibody interactions. Due to the high affinity and high selectivity of these interactions, extraction and clean-up of aqueous complex matrices are achieved on the same step. Therefore, chromatograms present very clean base-lines which greatly improves the detection and quantification of very polar analytes. Identification of analytes is reinforced since immunoextraction is based on a molecular structural recognition. Class-selective immunosorbents have been developed for the selective trapping of several groups of analytes structurally related such as polyaromatic hydrocarbons, benzidine and congeners, nitroaniline and aromatic amines. Comparison is given with real samples showing that most polar analytes cannot be detected at low level using conventional non-selective solid-phase extraction sorbents. Examples are presented for the determination of the two- to three-ring polyaromatic hydrocarbons as well as of basic polar industrial chemicals such as nitroaromatics and aromatic amines which are included in the US EPA or EEC priority lists of pollutants to be monitored in industrial effluents. These on-line procedures increase the speed of analysis, improve analyte delectability and can be integrated into on-site monitoring devices. © 相似文献
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Cornelia Vasile Mihai Adrian Brebu Tammer Karayildirim Jale Yanik Hristea Darie 《Journal of Material Cycles and Waste Management》2006,8(2):99-108
The increasing production of computers, the progress in their performance, and the shorter time between innovation and production
has led to increasing numbers of obsolete products. It has thus become necessary to recover some materials from old computers
and to protect the environment from a new type of pollution. Such recycling is difficult because of the diversity of polymeric
materials used, e.g., thermoplastics (polystyrene or acrylonitrile-butadiene-styrene) and thermosets (epoxy resins), and the
relatively high levels of flame retardants (halogen- and nitrogen-containing compounds) added during production. Pyrolysis
seems to be a suitable way to recover materials and energy from such waste without component separation if an efficient method
for reducing toxic compounds can be applied. In this study, the pyrolysis of plastic and thermoset fractions (keyboards, casings,
printed circuit boards, and mixtures thereof) of used computers was studied by thermogravimetry and batch reactor pyrolysis.
The degradation products were separated into three fractions, solid, liquid, and gaseous, each of them being characterized
by suitable methods such as gas chromatography (GC-MSD, gas chromatography-mass spectrometry detection; GC-AED, gas chromatography-atomic
emission detection), infrared (FT-IR) and 1H-NMR (nuclear magnetic resonanace) spectroscopy, and elemental analysis. It has
been established that most of the halogens, nitrogen, and sulfur is concentrated in the residue. However, the elimination
of hazardous toxic compounds, mainly those containing bromine, is necessary before being able to safely use the pyrolysis
oils as fuels or in refinery or petrochemical industry flows. 相似文献
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Akira Hoshino Maso Tsuji Masanori Momochi Akiko Mizutani Hideo Sawada Setsuo Kohnami Hiroki Nakagomi Michio Ito Hisato Saida Munehiro Ohnishi Michimasa Hirata Masao Kunioka Masahiro Funabash Shogo Uematsu 《Journal of Polymers and the Environment》2007,15(4):275-280
Several ISO standards for determining the ultimate aerobic/anaerobic biodegradability of plastic materials have been published.
In particular, ISO 14855-1 is a common test method that measures evolved carbon dioxide using such methods as continuous infrared
analysis, gas chromatography or titration and others (ISO 14855-1(2005.9)). This method is a small-scale test for determining
the ultimate aerobic biodegradability of plastic materials, where the amounts of compost inoculum and test sample in one tenth
comparing with that of ISO 14855-1. This method is well versed in ISO/DIS 14855-2 which the carbon dioxide evolved from test
vessel is determined by gravimetric analysis of carbon dioxide absorbent. The focus of this study is to elucidate statistically
the results of round robin test by seven countries used MODA, which were various deviations among the experiments. 相似文献