thepetroleum concentrations are contaminant important sources in the environment. hydrocarbon’s contaminants depend on their type and concentration can cause variable toxicity in soils, on the other hand, different kinds of plants also response concentration of contaminant differently, because of the diversity of physiological and morphological characteristics. in this study the effect of diffe...

When the hazardous substances are released in air duct of ventilation system, they transported into room through supply inlets, causing harm to indoor personnel. In system with recirculation, contaminant entering is recirculated return outlet, and then affects concentration air, making it difficult be determined. this work, a method proposed predict steady passive when duct. The based on fixed ...

This paper summarizes three mathematical models used to describe how contaminant concentration profiles in soil may be inferred from the intensities of neutron-induced capture-gamma photon intensities measured at the soil surface. In particular, the linear regularization, linear regularization with an iterative positivity constraint, and the Backus-Gilbert methods are applied to the soil contam...

Organic contaminant and total mercury concentrations were compared in four species of lamniform sharks over several age classes to examine bioaccumulation patterns and gain insights into trophic ecology. Contaminants found in young of the year (YOY) sharks were assumed to be derived from maternal sources and used as a proxy to investigate factors that influence maternal offloading processes. YO...

6 High sensitivity methods such as next generation sequencing and polymerase chain reaction (PCR) are adversely impacted by organismal and DNA contaminants. Current methods for detecting contaminants in microbial materials (genomic DNA and cultures) are not sensitive enough and require either a known or culturable contaminant. Therefore, high sensitivity methods not requiring a priori assumptio...

Advection flow is a dominating physical mechanism of contaminant transport over geologic fractured media. Natural fractures often combine into percolation cluster, having fractal properties. As a result long-ranged correlations arise in the fluctuating velocity field of infiltration flux. The presence of preferred direction due to the gravity force leads to the strong anisotropy of the advectio...

Stabilisation/solidification (S/S) of heavy metals and a parallel biodegradation of an organic contaminant using Magnesium phosphate cements (MPC) was investigated under laboratory conditions. The study was aimed at improving the robustness of S/S technology by encouraging biodegradation in order to bring about some form of contaminant attenuation over time. A silty sand soil, amended with comp...

The present paper addresses the leaching of hazardous contaminants from immersed and replenished materials and from granular materials flushed in a column. First, the leaching of an immersed material in contact with a limited volume of leachant is studied. The mass transfer from material to leachant is assumed to he inversely proportional to Jt (i.e. following the semiinfinite medium diffusion ...