查询词典 benzene

Phthalic acid esters are widely used in the many fields of industry. So many countries including China have come to pay attention to them and make up the codes for limiting the content in some products such as textile. By combining international codes, the thesis selects coating and textile that have close relative with people as objections. The research results are as follows:1. The thesis has established the textiles preparation method by a series of experimentations such as extraction solvent, extraction time, solid-phase extraction. The average recoveries of eleven phthalates are from 80.30% to 98.00%, and the relative standard deviations from 0.59% to 2.56%, the results show that this method is accurate and credible.2. The thesis set up the simultaneous determination of benzene, toluene, xylenes and phthalates in coatings.

邻苯二甲酸酯类化合物被广泛地应用在工业领域的各个方面，国际上已经开始重视邻苯二甲酸酯作为一种内分泌干扰素的危害性，对在一些产品中的用量作出了限制，但没有具体的分析测定方法，本论文结合国际法规选择了与人们生活密切相关的涂料和纺织品来研究其中邻苯二甲酸酯类环境激素的测定方法，研究内容如下：(1)通过对提取溶剂、提取方式、提取时间的选择实验以及固相萃取的一系列条件实验，首次建立了纺织品中测定邻苯二甲酸酯类环境激素的前处理方法，并对分析方法作了准确度、精密度验证。

The average recoveries of benzene, toluene,-xylenes, o-xylene are from 97.21% to 103.10% and the RSDs are from 0.12% to 0.95%. And the average recoveries of Phthalic acid ester are from 96.01% to 102.02% and the RSDs are from 0.92% to 2.46%.

2采用PTFE膜过滤前处理法，首次建立了涂料中苯系物和邻苯二甲酸酯类环境激素的同时测定方法，并对分析方法作了准确度、精密度以及实验室间验证。

Levels of benzene, toluene, ethylbenzene and the xylenes in different indoor microenvironments such as shopping centers, super markets, cinemas and station waiting rooms were investigated in Hangzhou.

分析评价了杭州市商场、超市、影院、车站候车室等公共场所室内空气中BTEX的污染特征、来源及健康风险。

Benzene, toluene, ethylbenzene, xylenes isomers and methyl tert-butyl ether exist widely in the groundwater contaminated by gasoline.

中文摘要苯、甲苯、乙苯、对二甲苯与甲基第三丁基醚(methyl tert-butyl ether，简称MTBE)普遍存在汽油污染的地下水中。

A series of three factors-three level orthogonal experiments were performed to investigate anaerobic biodegradation performance of BTEX （benzene, toluene, ethlybenzene and xylenes ）including three types of bacteria;nitrate, sulfate and ferric iron reducing conditions;20 mg·L^-1, 50 mg·L^-1 and 80 mg·L^-1 substrates concentration levels.

采用正交试验法对BTEX各个组分在不同菌种、不同电子受体和污染物不同起始浓度的条件下生物厌氧降解效率进行研究。

The compounds monitored for this purpose are petroleum hydrocarbons such as benzene, Toluene and Xylenes.

里面含有苯，甲苯，二甲苯。

The columns exhibited good separation ability for disubstituted benzene isomers, especially for xylenes and cresols. In addition, the three peralkylated-β-CD columns offer better selectivity than the (2,6-di-O-benzyl)-β-CD column.

同一根柱不同次进样和不同柱之间表现出良好的重复性，保留时间的相对标准偏差小于8.5%；对使用大约40次后的溶胶-凝胶柱重新进行测试，柱效下降不明显，说明该类色谱柱的稳定性良好。

As examples, the fungus degrades benzene, toluene, ethylbenzene, and xylenes (the so-called BTEX compounds), chlorinated compounds such as 2,4,5trichloroe- thylene, and trichlorophenols.

例如，这种真菌降解苯、甲苯、乙苯、和二甲苯，氯化物如2，4，5一三氯乙烯，三氯苯酚。

Under the same conditions, activity of thiolphenol is much lower than that of thiols. An electron withdrawing group on the benzene ring can decrease the reaction activity, but an electron donating group on the aliphatic compound can increase it.

在相同的反应条件下，苯硫酚的反应活性明显低于硫醇的反应活性；巯基化合物中吸电子基团会使反应活性降低，而推电子基团会使反应活性提高。

Arylselenoureas with electron donor group on benzene ringreacted with excess sulfinyl chloride to give 2-aminobenzosele-nazoles.

苯环上有给电子基的N-芳基硒脲在过量的氯化亚砜中自动氧化合环生成2-氨基取代笨并硒唑。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。