首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到18条相似文献，搜索用时 109 毫秒
1.
原油生物降解模拟实验及其定量化评价   总被引：1，自引：0，他引：1  
向廷生  黑花丽 《现代地质》2010,24(2):259-267
利用筛选到的优势烃降解复合菌(I菌)对大庆油田3口不同油井的油(西5-P10、三元后和G1131-262)进行不同时间的降解实验和全油GC-MS定量分析,探讨饱和烃、芳烃化合物分布情况变化。实验研究表明I菌为高效烃降解菌;相同微生物对此3种不同原油的降解能力存在明显的差异,所以烃污染现场生物修复试验需要根据不同原油性质选择不同的高效降解菌;对于饱和烃和芳烃生物降解的顺序既有对过去结论的验证又提出新的看法。藿烷的降解在重排甾烷之后,萘比菲先开始降解,三甲基萘比三甲基菲更早开始遭受生物降解,三甲基和四甲基萘在深度生物降解后会达到一个平衡,之后的降解速度减慢。当生物降解到一定阶段,抗生物降解能力强的多环芳烃富集会加重对环境的毒害,因此,多环芳烃降解菌或萘、菲降解菌等特效菌是未来烃污染环境修复工作的重点。  相似文献   

2.
生物降解作用对储层抽提物中多甲基取代萘分布的影响   总被引：5，自引：0，他引：5  
对辽河盆地冷东油田冷43块沙三段油藏3口取心井岩心抽提物进行了详细的地球化学分析, 族组成和饱和烃生物标志物分布显示油藏遭受了不同程度生物降解作用的影响, 降解程度由油柱顶部向底部增大, 呈良好梯度变化特征.对比不同降解程度原油样品中三甲基萘、四甲基萘和五甲基萘含量和分布可以发现生物降解的明显控制作用, 根据甲基取代萘异构体在生物降解过程中相对含量的变化初步确定了三甲基萘、四甲基萘和五甲基萘单个异构体的生物降解顺序, 结果表明那些热力学稳定性高的异构体容易遭受微生物的攻击, 而热力学稳定性低的异构体却在生物降解过程中相对富集, 表明生物降解作用完全不同于热力学作用过程, 当原油遭受中等程度生物降解作用影响后, 根据热力学稳定性提出的成熟度参数不再能提供有效的成熟度信息, 易降解和难降解异构体间的比值却是衡量原油遭受生物降解作用程度的地球化学新指标.   相似文献   

3.
石油烃中烷基萘的形成机理及其地球化学意义   总被引：2，自引：1，他引：1  
烷基蓁是原油中的重要组成部分,在指示成岩演化环境和成熟度变化方面非常有效.原油中含α,β位取代基的烷基萘异构体含量变化趋势相反,此即为烷基萘成熟度参数提出的依据.着重综述了石油烃中甲基萘两种主要生成途径--分子异构化反应和甲基化、去甲基化反应及其反应机理,以及烷基萘参数的应用概况,阐述了生物降解作用、水洗作用、内源混合作用和有机质来源及其他因素对烷基萘参数的影响,探讨了烷基萘参数应用过程中存在的问题与不足,并展望了今后的发展趋势.  相似文献   

4.
生物降解作用对原油中烷基菲分布的影响   总被引：1，自引：0，他引：1  
辽河盆地冷东油田原油来源单一,成熟度相近,生物降解是导致原油中烷基菲含量和组成发生变化的主要原因。通过对不同降解程度油砂样品中烷基菲含量和分布的详细地球化学分析,发现中等程度生物降解（3到5级）使烷基菲含量大大降低,而异构体相对含量的变化主要发生在中等程度生物降解之后（4级以上）,原油遭受4级以下生物降解影响时,烷基菲参数仍能有效指示成熟度。烷基菲生物降解的难易程度明显受烷基化程度的控制,C3-菲比低烷基取代化合物的抗生物降解能力强,但甲基菲比菲更容易降解,推测这与甲基菲的脱甲基作用有关。生物降解对烷基菲各异构体的消耗有强烈的选择性,在9位或 10位上取代的烷基菲比其他位置取代的烷基菲抗生物降解能力强,根据烷基菲系列中化合物相对含量随生物降解程度的变化,确定了甲基菲、C2-菲和C3-菲各异构体的生物降解顺序,研究成果为芳烃成熟度参数的合理选用和生物降解定量评价提供了依据。  相似文献   

5.
萘及烷基萘是原油和沉积有机质的重要组成。目前对于烷基萘单体稳定碳同位素组成随有机质成熟作用加深的演变特征鲜见报道。本研究选取松辽盆地杜601井嫩一段低熟黑色泥岩进行热压模拟生烃实验,采用两步柱色谱层析技术分离烷基萘化合物使其达到稳定碳同位素的在线准确测定,从而厘定有机质不同成熟阶段烷基萘单体稳定碳同位素组成分布面貌。实验结果显示,不同模拟实验温度点排出的一甲基萘(MNs)和二甲基萘(DMNs)各异构体具有相对一致的稳定碳同位素值,分别介于–29.5‰~–29.3‰和–30.9‰~–30.5‰之间,这可能与生烃过程中干酪根的非均一性裂解有关;三甲基萘(TMNs)各异构体之间稳定碳同位素值差异较大,介于–36.8‰~–31.1‰之间,这可能与生源效应有关;其中,1,2,5-TMN稳定碳同位素组成偏轻,介于–36.8‰~–35.6‰之间,可能是细菌来源的藿类化合物降解及其芳构化的产物。实验结果表明,随着有机质热演化作用的加深,烷基萘单体稳定碳同位素组成变化介于0.8‰~1.4‰之间,基本在仪器测试误差范围之内,反映成熟作用所导致的烷基萘单体稳定碳同位素动力学分馏较小。因此,烷基萘单体稳定碳同位素组成可以成为油-源和油-油对比的潜在指标。  相似文献   

6.
污染土壤中多环芳烃的微生物降解及其机理研究进展   总被引：24，自引：1，他引：24  
多环芳烃(PAHs)是一类普遍存在于环境中的难降解危险性“三致”有机污染物。微生物对多环芳烃的降解是去除土壤中多环芳烃的主要途径。研究表明，对于土壤中低分子量多环芳烃类化合物，微生物一般以唯一碳源方式代谢；而大多数细菌和真菌对四环或四环以上的多环芳烃的降解作用一般以共代谢方式开始。本文重点论述了高分子量多环芳烃：芘和苯并(a)芘的微生物降解及其机理。并介绍了多环芳烃污染的微生物—植物联合修复机制，最后展望了污染土壤中多环芳烃的研究趋势。  相似文献   

7.
贾望鲁  彭平安 《地球化学》2004,33(2):139-146
利用瞬间热解、甲基化-热解和钌离子催化氧化(RICO)降解技术研究了塔里木盆地轮南地区原油沥青质的分子结构,并对其在石油地球化学研究中的指示意义进行了讨论.轮南地区原油沥青质分子中的取代官能团以烷基侧链为主,烷基桥次之,另外还有少量的烷基-环己烷、支链烷烃和苯系物,这些化合物可能大都以C-C键结合到缩合芳环体系上;沥青质分子中的芳环体系大多数可能是萘或菲类型的芳香结构,高度缩合的芳香结构可能较少.轮南地区不同构造带原油沥青质热解产物的一致性指示它们可能来自沉积环境相同的母源.沥青质的分子结构表明,其母源可能主要来自浮游藻类的类脂物.热解产物中较高含量的1,2,3,4-四甲基-苯和2,6-二甲基、2,6,10-三甲基烷烃类化合物的检出表明其母质可能形成于较强的还原环境.沥青质热解产物中姥鲛-1-烯的相对含量较低,RICO产物中一元脂肪酸远高于二元脂肪酸,指示该区原油具有较高的成熟度.部分脂肪酸类化合物通过酯键连接在沥青质分子中,可能反映了原油在储层中经历了生物降解等后生作用.  相似文献   

8.
采用人工合成标准物质共注实验、与文献报道的保留指数对比并结合异构体的结构及性质的方法,对石油和沉积有机质中 C3-和 C4-烷基取代二苯并噻吩类含硫多环芳烃化合物进行了系统的鉴定。确定了常规色谱质谱（GC-MS）分析中,烷基取代二苯并噻吩异构体在 HP-5MS （5%-苯基甲基聚硅氧烷）色谱柱上的标准保留指数。确认了前人初步鉴定的部分三甲基二苯并噻吩异构体甲基取代基位置,初步比较了 C3-和 C4-烷基取代二苯并噻吩在不同成因石油和沉积有机质中的分布特征,初步探讨了 C3-和 C4-烷基取代二苯并噻吩潜在的地球化学意义。研究结果为今后进一步探索烷基取代二苯并噻吩系列在石油和沉积有机质中的地球化学意义奠定了可靠的基础。  相似文献   

9.
生物降解原油中吡咯氮化合物组成的变化   总被引：1，自引：0，他引：1  
渤海海域地区近50个原油样品中性氮组分的GC／MS定量分析资料表明,油藏中的生物降解作用对原油的吡咯氮化合物含量和分布有明显影响。经与同源未降解原油比较,各种烷基咔唑和苯并咔唑在3。4级中轻度降解油中就出现明显降解迹象,随生物降解程度增高其含量逐渐减少,在6—8级严重降解油中它们的总含量降低到原有的五分之一左右。在3—4级中轻度降解油中,裸露型甲基咔唑异构体更容易被微生物侵袭而代谢,抗生物降解能力按1-甲基咔唑〉4-甲基咔唑〉2-、3-甲基咔唑顺序递减;当降解程度更高时,这些化合物降解速率相当,1-／4-MCA等比值相对稳定。低-中等降解阶段,不同类型二甲基咔唑异构体的抗生物降解能力也存在明显差异性,呈屏蔽型〉半屏蔽型〉裸露型降低;在生物降解水平进一步增高时,这些异构体之间的相对含量变化不大。生物降解作用对苯并咔唑系列化合物分布的影响具有不确定性,且随降解程度的增加变得更为显著,降解油中【a】／[c】苯并咔唑比值或增高或降低。生物降解原油中吡咯氮化合物的组成变化,使降解油的二次运移示踪面临新的问题。  相似文献   

10.
水中多环芳烃前处理过程中的污染来源及去除方法   总被引：2，自引：2，他引：0  
实验设备、耗材等物品以及实验室环境中都有可能存在一定浓度的多环芳烃,造成样品在前处理过程中可能受到污染,从而影响多环芳烃测定结果的准确性。文章系统地研究了水样分析中萘、苊、芴、菲、蒽等多环芳烃污染物的引入和去除方法。在排除了数据处理和仪器测试的原因后,确认污染来自于样品前处理过程。对容器污染、试剂干扰、前处理间环境污染和氮吹浓缩系统等因素的排查结果表明,氮吹浓缩系统是主要的污染源。进一步实验证实,氮气、减压阀以及连接管线等均可造成多环芳烃污染。通过采取更换氮气、减压阀和连接管线的措施,并将氮气通过活性炭柱,能够有效地去除这些污染。实验设计了装有活性炭的玻璃柱装置,可以有效去除存在的萘等多环芳烃物质的污染;但专用减压阀避免多环芳烃污染的效果验证、氮气中多环芳烃污染物的来源确认以及多环芳烃污染去除装置的优化改进等问题还有待于进一步研究。  相似文献   

11.
The type of source organic matter of West Siberian oils localized at depths of 1425 to 3950 m in Cretaceous, Jurassic, and Paleozoic deposits is determined based on the composition of bio- and geomarkers. The individual and group compositions of alkylnaphthalenes of these oils are studied. The geochemical parameters of oil transformation are calculated from the composition of methyl-, dimethyl-, and trimethylnaphthalenes. Data on the individual composition of alkylnaphthalenes are processed by the method of principal components of factor analysis. The matrix is compiled of 44 oils and 22 characteristics (contents of individual alkylnaphthalenes). The molecular-mass distributions of alkylnaphthalenes in oils of different genesis served as a basis for the separation of the latter into families according to the compositional similarity of biarenes and the degree of oil transformation.  相似文献   

12.
A suite of 18 oils from the Barrow Island oilfield, Australia, and a non-biodegraded reference oil have been analysed compositionally in order to detail the effect of minor to moderate biodegradation on C5 to C9 hydrocarbons. Carbon isotopic data for individual low molecular weight hydrocarbons were also obtained for six of the oils. The Barrow Island oils came from different production wells, reservoir horizons, and compartments, but have a common source (the Upper Jurassic Dingo Claystone Formation), with some organo-facies differences. Hydrocarbon ratios based on hopanes, steranes, alkylnaphthalenes and alkylphenanthrenes indicate thermal maturities of about 0.8% Rc for most of the oils. The co-occurrence in all the oils of relatively high amounts of 25-norhopanes with C5 to C9 hydrocarbons, aromatic hydrocarbons and cyclic alkanes implies that the oils are the result of multiple charging, with a heavily biodegraded charge being overprinted by fresher and more pristine oil. The later oil charge was itself variably biodegraded, leading to significant compositional variations across the oilfield, which help delineate compartmentalisation. Biodegradation resulted in strong depletion of n-alkanes (>95%) from most of the oils. Benzene and toluene were partially or completely removed from the Barrow Island oils by water washing. However, hydrocarbons with lower water solubility were either not affected by water washing, or water washing had only a minor effect. There are three main controls on the susceptibility to biodegradation of cyclic, branched and aromatic low molecular weight hydrocarbons: carbon skeleton, degree of alkylation, and position of alkylation. Firstly, ring preference ratios at C6 and C7 show that isoalkanes are retained preferentially relative to alkylcyclohexanes, and to some extent alkylcyclopentanes. Dimethylpentanes are substantially more resistant to biodegradation than most dimethylcyclopentanes, but methylhexanes are depleted faster than methylpentanes and dimethylcyclopentanes. For C8 and C9 hydrocarbons, alkylcyclohexanes are more resistant to biodegradation than linear alkanes. Secondly, there is a trend of lower susceptibility to biodegradation with greater alkyl substitution for isoalkanes, alkylcyclohexanes, alkylcyclopentanes and alkylbenzenes. Thirdly, the position of alkylation has a strong control, with adjacent methyl groups reducing the susceptibility of an isomer to biodegradation. 1,2,3-Trimethylbenzene is the most resistant of the C3 alkylbenzene isomers during moderate biodegradation. 2-Methylalkanes are the most susceptible branched alkanes to biodegradation, 3-methylalkanes are the most resistant and 4-methylalkanes have intermediate resistance. Therefore, terminal methyl groups are more prone to bacterial attack compared to mid-chain isomers, and C3 carbon chains are more readily utilised than C2 carbon chains. 1,1-Dimethylcyclopentane and 1,1-dimethylcyclohexane are the most resistant of the alkylcyclohexanes and alkylcyclopentanes to biodegradation. The straight-chained and branched C5–C9 alkanes are isotopically light (depleted in 13C) relative to cycloalkanes and aromatic hydrocarbons. The effects of biodegradation consistently lead to enrichment in 13C for each remaining hydrocarbon, due to preferential removal of 12C. Differences in the rates of biodegradation of low molecular weight hydrocarbons shown by compositional data are also reflected in the level of enrichment in 13C. The carbon isotopic effects of biodegradation show a decreasing level of isotopic enrichments in 13C with increasing molecular weight. This suggests that the kinetic isotope effect associated with biodegradation is site-specific and often related to a terminal carbon, where its impact on the isotopic composition becomes progressively ‘diluted’ with increasing carbon number.  相似文献   

13.
The occurrence and distribution of polycyclic aromatic hydrocarbons (PAHs) has been studied in oil columns from the Liaohe basin, NE China, characterized by varied degrees of biodegradation. The Es3 oil column has undergone light to moderate biodegradation – ranging from levels 2 to 5 on the [Peters, K.E., Moldowan, J.M., 1993. The Biomarker Guide: Interpreting Molecular Fossils in Petroleum and Ancient Sediments. Prentice Hall, Englewood Cliffs, NJ, p. 363] scale (abbreviated as ‘PM level’) – while the shallower Es1 column has undergone more severe biodegradation, ranging from PM level 5 to 8. Both columns show excellent vertical biodegradation gradients, with degree of biodegradation increasing with increasing depth toward the oil–water contact (OWC). The compositional gradients in the oil columns imply mass transport control on degradation rates, with degradation occurring primarily at the OWC. The diffusion of hydrocarbons to the OWC zone will be the ultimate control on the maximum degradation rate. The chemical composition and physical properties of the reservoired oils, and the ‘degradation sequence’ of chemical components are determined by mixing of fresh oil with biodegraded oil.The PAH concentrations and molecular distributions in the reservoired oils from these biodegraded columns show systematic changes with increasing degree of biodegradation. The C3+-alkylbenzenes are the first compounds to be depleted in the aromatic fraction. Concentrations of the C0–5-alkylnaphthalenes and the C0–3-alkylphenanthrenes decrease markedly during PM levels 3–5, while significant isomer variations occur at more advanced stages of biodegradation (>PM level 4).The degree of alkylation is a critical factor controlling the rate of biodegradation; in most cases the rate decreases with increasing number of alkyl substituents. However, we have observed that C3-naphthalenes concentrations decrease faster than those of C2-naphthalenes, and methylphenanthrenes concentrations decrease faster than that of phenanthrene. Demethylation of a substituted compound is inferred as a possible reaction in the biodegradation process.Differential degradation of specific alkylated isomers was observed in our sample set. The relative susceptibility of the individual dimethylnaphthalene, trimethylnaphthalene, tetramethylnaphthalene, pentamethylnaphthalene, methylphenanthrene, dimethylphenanthrene and trimethylphenanthrene isomers to biodegradation was determined. The C20 and C21 short side-chained triaromatic steroid hydrocarbons are degraded more readily than their C26–28 long side-chained counterparts. The C21–22-monoaromatic steroid hydrocarbons (MAS) appear to be more resistant to biodegradation than the C27–29-MAS.Interestingly, the most thermally stable PAH isomers are more susceptible to biodegradation than less thermally stable isomers, suggesting that selectivity during biodegradation is not solely controlled by thermodynamic stability and that susceptibility to biodegradation may be related to stereochemical structure. Many commonly used aromatic hydrocarbon maturity parameters are no longer valid after biodegradation to PM level 4 although some ratios change later than others. The distribution of PAHs coupled with knowledge of their biodegradation characteristics constitutes a useful probe for the study of biodegradation processes and can provide insight into the mechanisms of biodegradation of reservoired oil.  相似文献   

14.
The thermal maturity and organofacies sensitivity of polycyclic aromatic compound (PAC) distributions was explored by examination of the aromatic fractions of solvent extracts from a diverse set of 53 shales, coals and kerogen macerals which have undergone either natural or artificial maturation and which represent all three principal sedimentary organic matter (OM) types. Systematic changes with maturation were observed in the following groups of isomers: tri- and tetramethylnaphthalenes, methyl- and dimethylphenanthrenes, methyl- and dimethyldibenzothiophenes, methylpyrenes, and methylchrysenes. The maturity differences were quantified by mathematical ratios of the relative concentrations of the more thermally stable isomers to the less stable, on the basis of theoretical considerations and empirical observations. The PAC maturity parameters, unlike those derived from saturated biomarker stereoisomers, are typically effective across the entire oil generation window. To compensate for the effects of OM type on the maturity parameters, they were combined using principal components analysis. The resulting first principal component was in good agreement with independent indicators of maturity. The relative distributions of C0–C3 alkylphenanthrenes, dibenzothiophene, methyldibenzothiophenes and methyldibenzofurans were evaluated by a separate principal components analysis. The results permitted an independent grouping of the samples by OM type and suggested additional, simple molecular ratios that allow graphical recognition of OM type, including the ratio of dibenzothiophenes to dibenzofurans and a ratio using C2-alkylphenanthrene isomers.  相似文献   

15.
济阳拗陷特殊生物降解油的初步研究   总被引：1，自引：1，他引：0  
济阳拗陷草古100平19井奥陶系储层原油,饱和烃馏分均已损失殆尽,仅残余藿烷系列化合物;同时,芳烃馏分化合物也已损失殆尽,仅残余三芳甾烷系列化合物。上述芳烃化合物俱已损失殆尽的蚀变特征,在相关文献中的报道较为少见。原油中不受水洗作用影响的正构烷烃和不受生物降解作用影响的有机硫化合物(苯并噻吩和二苯并噻吩)均已损失殆尽,显然暗示了原油蚀变是遭受水洗作用和生物降解作用共同作用的结果。原油芳烃馏分的“UCM”鼓包幅度明显大于饱和烃馏分的“UCM”鼓包,暗示了芳烃化合物的降解速率平行甚至超过饱和烃的降解速率。原油中低分子量芳烃化合物的快速降解,暗示了油藏可能是在氧化条件下而非在还原条件下发生蚀变的。  相似文献   

16.
芳烃作为原油和烃源岩中可溶烃的一个重要组分,能提供烃源岩沉积环境、有机质来源、热演化程度和油源对比等多方面信息,并且其比饱和烃具有更强的抗生物降解作用的能力,因此广泛用于生物降解油的相关研究。生物降解油广泛分布于中国青藏高原羌塘盆地,为了有效开展羌塘盆地油源对比研究工作,本文对隆鄂尼地区油苗开展了系统的芳烃有机地球化学特征研究,样品中检测出的15类化合物系列中菲系列含量极高,其次为三芴系列,萘系列含量较低,但同样检测出一定量的源于陆源高等植物母质的化合物,如卡达烯、惹烯和海松烯等,这表明羌塘盆地生油母质以海相低等水生生物为主,同时有一定量陆源高等植物输入。芳烃成熟度参数研究表明,甲基萘指数由于受到混源影响而不能单独用于成熟度评价,而甲基菲指数和甲基二苯并噻吩指数是羌塘盆地原油成熟度研究的有效指标,综合各类成熟度指标研究表明,羌塘盆地原油属于成熟油。  相似文献   

17.
In a previous study, oils in the Potwar Basin (Upper Indus) of Pakistan were correlated based on the dissimilarity of source and depositional environment of organic matter (OM) using biomarkers and bulk stable isotopes. This study is aimed at supporting the classification of Potwar Basin oils into three groups (A, B and C) using the distribution of alkylnaphthalenes, alkylphenanthrenes, alkyldibenzothiophenes, alkyldibenzofurans, alkylfluorenes, alkylbiphenyls, triaromatic steroids, methyl triaromatic steroids, retene, methyl retenes and cadalene. The higher relative abundance of specific methyl isomers of naphthalene and phenanthrene and the presence of diagnostic aromatic biomarkers clearly indicate the terrigenous and oxic depositional environment of OM for group A oil. Group B and C oils are of marine origin and the aforementioned heterocyclic and polycyclic aromatic hydrocarbons (HCs) differentiate them clearly into two different groups. The relative percentages of heterocyclic aromatic HCs reveal that the distribution of these compounds is controlled by the depositional environment of the OM. Sulfur-containing heterocyclic aromatic HCs are higher in crude oils generated from source rocks deposited in suboxic depositional environments, while oxygen-containing heterocyclic aromatic HCs in combination with alkylfluorenes are higher in marine oxic and deltaic oils. Biomarker and aromatic HC parameters do not indicate significant differences in the thermal maturity of Potwar Basin oils. Triaromatic and methyl triaromatic steroids support the division of Potwar Basin oils into the three groups and their relative abundances are related to source OM rather than thermal maturity. Significantly higher amounts of C20 and C21 triaromtic steroids and the presence or absence of long chain triaromatic steroids (C25, C26, C27, and C28) indicates that these compounds are probably formed from different biological precursors in each group. Different isomers of methyl substituted triaromatic steroids are present only for short chain compounds (C20–C22) and the origin of these compounds may be short chain methyl steranes from unknown biological precursors.  相似文献   

18.
Contamination of coastal marine sediments with polycyclic aromatic hydrocarbons is pervasive, with major sources including anthropogenic activity and natural seepage. Biodegradation serves as a major hydrocarbon sink with evaporation and dissolution responsible for the removal of low boiling range compounds and photo-oxidation acting on many multi-substituted aromatic compounds. In this work, first-order rate constants for aerobic biodegradation were quantified for naphthalene (N), benzothiophene (BT) and their alkylated congeners (1-4 carbon substituents (C1-C4)) in laboratory experiments with oil laden marine sediments from a natural seep. Rate constants were used as proxies for microbial preference, which follows the order: naphthalene > C1N > C2N > C1BT > C2BT > benzothiophene > C3BT > C3N > C4BT > C4N, with some overlap. The application of comprehensive two dimensional gas chromatography further enabled separation and quantification of multiple structural isomers for C2N-C4N and C2BT-C4BT, with 7-12 isomers resolved for each C2N-C4N and 4-7 isomers resolved for each C2BT-C4BT. A strong isomeric biodegradation preference was noted within each of these compound classes, with rate constants varying as much as a factor of 2 for structural isomers of the same compound class. Each isomer was consumed to a low, but non-zero concentration, suggesting that their residual load in sediment may be proportional to the number of structural isomers originally present, in addition to the pattern and the number of alkyl substitutions. The simultaneous first-order biodegradation rates observed for 52 aromatic hydrocarbons resolved in this study, along with reference compounds such as n-alkanes, lends support to the concept of broad scale metabolic specificity during aerobic biodegradation of petroleum.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号