查询词典 PAHs

They are low-toxicity、long effect contaminations,It is difficult to wipe them off.

萘是常见的多环芳烃化合物，它是16种优先控制PAHs的一种。

Results of study indicate that background values of priority PAHs, in aerosols in Pear River Delta area, including naphthalene,acenaphthylene, acenaphthene,fluorene,phenanthrene,anthracene, fluoranthene, pyrene, benzoanthracene, chrysene,benzofluoranthene, benzofluoranthene,benzopyrene, indeno(1,2,3-cd)pyrene, dib...

研究结果表明，珠江三角洲地区大气气溶胶中优控多环芳烃背景值萘、苊、二氢苊、芴、菲、蒽、荧蒽、芘、苯并蒽、、苯并荧蒽、苯并荧蒽、苯并芘、茚并（1，2，3-cd）芘、二苯并蒽、苯并分别为n.d。

The principal PAHs compounds in study area were naphthalene,phenathrene and chrysene.

研究区主要污染物为Nap、Phe和Chr/y。

The recoveries of seawater and sediment are :naphthalene 73. 0% and 75. 3%, phenanthrene79. 2%and78. 0%, fluoranthene 88. 1% and 80. 7%, pyrene 73. 8% and 70. 2%, chrysene 77. 6% and 72. 8%, benzofluoranthene 87. 6% and 83.6%, benzo pyrene 120. 3% and 110. 0%, respectively.

通过对7种多环芳烃标准样品的高效液相色谱法的定性、定量分析，结果表明，该方法可有效分离PAHs，回收率较高，海水和沉积物中的回收率分别为：萘73.0％和75.3％，菲79.2％和78.0％，荧蒽88.1％和80.7％，芘73.8％和70.2％，屈77.6％和72.8％，苯并荧蒽87.6％和83.6％，苯并芘120.3％和110.0％。

Results The two OHCB species in the defined consortia 22CO-6+PY97S and JZ9B+PY97S exhibited strong syntrophic effects in the oil biodegradation process. And the degradation rates of oil were increased from 27.81% and 83.52% to 64.03% and 86.89%, respectively. The consortia could degrade aliphatic and aromatic fraction at the same time, including high molecular weight-PAHs chrysene and its alkyl derivatives.

构建的降解菌群22CO-6+PY97S和JZ9B+PY97S中2种专性解烃菌具有明显的协同效应，它们可以使原油降解率从27.81%、83.52%分别提高到64.03%和86.89%，并且可以同时降解石油中的烷烃、芳香烃组分，包括高分子量多环芳烃chrysene及其衍生物。

The main conclusions of this thesis were as follows: 1 Through compared the original peaks, relative concentration distribution and diagnostic ratios of normal alkanes,Naphthalene, Dibenzothiophene, Fluorene, Phenanthrene, Chrysene and their alkyl PAHs, terpane-sterane biomakers of five crude oils, it was confirmed that five single crude oil was unmatched each other.

通过正构烷烃、萘、菲、芴、二苯并噻吩、屈及其烷基化系列多环芳烃、甾萜类生物标志物的原始谱图比较；组分浓度的分布模式比较；诊断比值的比较；对5种不同地质层次的原油进行了鉴别，结果表明5种原油均为独立油样，这与实际情况相符和；t检验分析的使用，使得溢油鉴别更加科学化，定量化；SPSS模糊聚类的使用，使得各油样之间&亲疏远近&的关系，即&属于的程度不同&的概念得以充分表现；明确了&是非&分明的概念。

The PAHs sorption on soil/sediment resulted from coaction of mineral substances and organic matter other than surface sorption or distribution process only.

在多环芳烃吸附过程中，如何结合其定量结构性质、有机无机复合体的界面结构以及环境化学特征认识吸附机理是今后研究的一个趋势。

However, PARs in snow ice insoluble particulates, cryoconite and surface soil around the Qiyi Glacier are dominated by those of four to six rings.

雪冰和冰川融水样品中相对富集3环和4环，雪冰不溶微粒和冰尘以及七－冰川周围表层土壤样品主要以4-6环为主，这是由PAHs自身的物理化学性质决定的。

Compared with the corresponding environmental guideline values, PAHs components, such as naphthalene, phenanthrene, fluorene, anthracene, Benzo fluoranthene and benzo fluoranthene, may have/had different level of biological effects.

此外，参照有关环境质量标准，发现悬浮颗粒物中萘、菲、芴、蒽／苯并荧蒽和苯并荧葱等化合物已经产生不同程度的生物影响效应。

The results show that ∑ PAH16 contents in source separation household bio-organic waste and composting production is 2,19 and 1.96 mg/kg DM, and the contents of naphthalene, fluorene, phenanthrene, fluoranthene are relatively higher than others.

结果表明，源分类家庭生物有机垃圾及其堆肥产品中∑PAH16化合物含量分别为2.19和1.96mg/kg，其中萘、芴、菲、荧蒽含量相对较高，占总量的79.76%和81.76%，这4种有机物的苯环在2-3之间，属于易降解非致癌物质，在农田施用中易被降解；在生物垃圾堆肥过程中∑PAH16的生物降解率为25.88%，堆肥后产品PAHs含量符合农田使用标准。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐