多环芳烃

Through annual monitoring in different domains and seasons,,we had a rudimentary grasp of changing law and composition of polycyclic aromatic hydrocarbon in the air of urban area.

通过全年按不同功能区、不同季节的监测，对市区空气中多环芳烃的组成和变化趋势有了初步的了解，定性检出57种多环芳烃。

With the reduction of SOM content and the elevation of contamination concentration, the difference between PHE and PYE decreases gradually, while B［a］PYE exhibits a significant difference from them. This could be attributed to the high lipophilicity and large molecular size of B［a］PYE, which make the molecule of B［a］PYE to be more easier to be held in the nanopores of clay and the dense region of SOM.

不同多环芳烃SPMD辅助解吸率差别很大，随着土壤有机质含量的降低，以及污染物浓度的提高，菲和芘的解吸差异逐渐缩小，而苯并［a］芘与上述2种多环芳烃的差异很大，主要是由于苯并［a］芘具有高度亲脂性，并且分子较大，造成其容易滞留在粘土的微孔及有机质的致密结构中。

This method is sensitive, accurate and suitable to the determination of PAHs in smoked meat.Key words: gas chromatography/mass spectrometry; polycyclic aromatic hydrocarbons; smoked meat

方法具有灵敏度高、准确度好、能同时分离测定20余种多环芳烃化合物的优点，适合于熏肉中多环芳烃化合物的分析测定。

The trend was that the pollution of particle-bound PAHs under the viaduct was more serious than on th...

同时，同一地点颗粒物及其中多环芳烃连续24h的监测结果表明，在24h内，大气中颗粒物及其中的多环芳烃含量有规律的波动，在清晨、下午出现两个高峰。

Petroleum-derived contamination may be dominant source in the study area depending on the distribution of fluoranthene/pyren, benzo anthracene/ benzo (a anthracene + chrysene BaA/(BaA+ Cy, MP/P.

对多环芳烃特征组分的比值（荧蒽／芘、苯并蒽／BaA/(BaA+Cy及甲基菲与菲的比值分析表明：该河流表层沉积物的多环芳烃主要来源于原油污染。

With the seedlings of model plant Arabidopsis thaliana and the polycyclic aromatic hydrocarbon fluoranthene as test materials,this paper studied the physiological responses of plants to polycyclic aromatic hydrocarbons from the aspects of antioxidases and membrane protection system that are tightly related to abiotic stresses.

选用模式植物拟南芥为材料，以四环的多环芳烃荧蒽为研究对象，从植物对非生物胁迫响应紧密相关的抗氧化酶及膜保护系统的变化入手，研究了植物对多环芳烃胁迫的生理响应。

Fifty-seven kinds of polycyclic aromatic hydrocarbon were detected by qualitative method,and sixteen kinds of those were mensurated by quantitative method.The results suggested that the average concentration of chry was the highest,21.83 ng/m3;the average concentration of fluoranthene was the second highest, 21.14 ng/m3; the mass c...

并对16种多环芳烃定量测定，结果表明：以屈艹为最高，平均值为21.83ng/m3；荧蒽次之，平均值为21.14ng/m3；苯并芘的质量浓度为14.52ng/m3，不满足GB3095-96中的质量浓度限值。2001～2003年检测结果对比表明，部分监测点空气中多环芳烃的浓度有下降的趋势。

PM10 and PM2.5 samples were collected in Beijing city during the spring, summer, autumn and winter seasons. Following the U.S. EPA-610 method, 18 priority polycyclic aromatic hydrocarbons were quantified by GC-MS. The results show that pollution from in haled particles (PM10) was serious and that the finer particles (PM2.5) account for much of the pollutant.

采集了春、夏、秋、冬4个季节的PM10和PM2.5颗粒物样品，参考美国EPA-610方法，利用色谱－质谱技术对美国环保总局推荐的18种优控多环芳烃进行了内标法定量分析，并探讨了多环芳烃的分布特征和来源。

There are more than 100 different PAHs.Most PAHs do occur alone in the enironment.

绝大多数的多环芳烃在环境中不是单独存在，它们往往是两个或更多的多环芳烃的混合物。

Most PAHs do occur alone in the environment. Rather they are found as mixtures of two or more PAHs

绝大多数的多环芳烃在环境中不是单独存在，它们往往是两个或更多的多环芳烃的混合物。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。