Author: James Edward SzecsödyPublisher:
ISBN:
Category : Organic compounds
Languages : en
Pages : 512
Book Description
Sorption Kinetics of Hydrophobic Organic Compounds Onto Organic Modified Surfaces
Author: James Edward SzecsödyPublisher:
ISBN:
Category : Organic compounds
Languages : en
Pages : 512
Book Description
Sorption Kinetics and Mechanisms of Hydrophobic Ionizable Organic Compounds on Surfactant-modified Clays
Author: Michael G. StapletonPublisher:
ISBN:
Category :
Languages : en
Pages : 334
Book Description
Modeling the Sorption and Desorption Kinetics of Hydrophobic Organic Compounds in Mixed Systems
Author: Douglas Horton ErrettPublisher:
ISBN:
Category :
Languages : en
Pages : 150
Book Description
Thermodynamics and Kinetics of Hydrophobic Organic Compound Sorption in Natural Sorbents and Quantification of Black Carbon by Electron Microscopy
Author: Dave Ta Fu KuoPublisher:
ISBN:
Category :
Languages : en
Pages : 1258
Book Description
The sorption behaviors of hydrophobic organic compounds (HOCs) in sediments were investigated using pyrene. Native pyrene desorbed slowly, taking from weeks to months to equilibrate. The end-point data suggested that, at nanogram-pyrene-per-liter porewater levels, sorption was much stronger than conventionally expected. The non-linearity of the isotherm may indicate physical occlusion of native sorbate and/or sorption onto micropore surfaces of char/charcoal. Between 30-70% of the native pyrene may be occluded. Conceptual pictures for both hypotheses were presented with supportive evidence from experiments and literature. Analysis of experimental and literature data suggested logKoc (organic-carbon normalized partition coefficient) and logKBC (black-carbon normalized partition coefficient) values were fairly constant across different geosorbents (around 4.5-5.7 and 5.6-6.3, respectively), while the non-linearity exponent varied substantially. This may explain the orders of magnitude scatter in logKoc's and logKBC's reported in recent reviews. An a priori non-linear numerical model based on Intra-particle Porewater Diffusion (IPD) was constructed and successfully predicted the desorption kinetics of native pyrene. Fitted kinetic parameters correlated with system and sorbate/sorbent properties. This suggested the empirical approach can be replaced by the a priori model and the diverse HOC desorption rates in the literature can be reconciled if relevant physicochemical properties are known. The regional fate of pyrene in Boston Harbor was evaluated with a box model using derived kinetic and equilibrium properties. Realistic predictions can be obtained when assuming pseudo steady state conditions, but not equilibrium partitioning, for the bed sediment and the water column. Furthermore, model results and literature evidence suggested that sediment resuspension may be a significant mobilization mechanism for sedimentary HOCs in estuaries and harbors. A new BC quantification method based on energy dispersive X-ray spectroscopy (EDX) was developed. The method identified/quantified Organic Carbon (OC) or Black Carbon (BC) by analyzing the elemental ratios of C, N, and 0 of the sample. Agreeable OC/BC estimates on a variety of carbonaceous materials were obtained using the method. The good analytical potential of the method warranted further exploration and methodological refinement. This study has great implications for the sequestration and bioavailability of HOCs in the environment.
Organic Substances and Sediments in Water
Author: Robert A. BakerPublisher: CRC Press
ISBN: 9780873715287
Category : Technology & Engineering
Languages : en
Pages : 564
Book Description
The fate and transport of natural and anthropogenic sediment-borne organic contaminants is a critical environmental issue and complex processes are involved that until now have been poorly defined. Organic Substances and Sediments in Water is a three-volume book that provides the best information available regarding the many interdisciplinary factors affecting organic substances associated with particulates in water. Topics discussed include absorption and transport of contaminants associated with particles; interfacial processes affecting fate and transport of organic substances associated with particles; the release of contaminants in receiving water bodies; water treatment; the role of biological factors in the fate and transport of organic contaminants in aqueous systems; development of biotransformation in natural and anthropogenic systems; the use of organic contaminant and sediment chemicals; biological and physical data to refine models to be used by resource managers; and chemical and biological processes that affect the fate and transport of organic constituents and determine degradation of contaminants and uptake in plants. This will be an important reference for environmental chemists, environmental engineers, environmental biologists, water treatment and natural system modelers, and soils scientists.
Solubility, Sorption and Transport of Hydrophobic Organic Chemicals in Complex Mixtures
Author: Palakurth Suresh Chandra RaoPublisher:
ISBN:
Category : Hazardous wastes
Languages : en
Pages : 20
Book Description
The Desorption Kinetics of Nonionic Organic Compounds from Hexadecyltrimethylammonium-modified Soils and Clays
Author: Thomas Reinhardt BenzingPublisher:
ISBN:
Category : Ammonium compounds
Languages : en
Pages : 278
Book Description
Sorption of Hydrophobic Organic Compounds (HOCs) to Inorganic Surfaces in Aqueous Solutions
Author: Yuan QianAdsorption Kinetics of Five Hydrophobic Organic Compounds on Alpha Aluminum Oxide in a Mini Column
Author: Matthew D. MitchellPublisher:
ISBN:
Category : Environmental chemistry
Languages : en
Pages : 224
Book Description
Hazardous Chemicals Associated with Plastics in the Marine Environment
Author: Hideshige TakadaPublisher: Springer
ISBN: 3319955683
Category : Science
Languages : en
Pages : 322
Book Description
This volume consists of 15 chapters and focuses on hazardous chemicals, how they are associated with plastics, and their environmental risks. It includes background information on plastics and additives chemistry, and their observed or potential effects on living organisms as well as the oceanographic aspects of marine debris dispersion. The respective chapters provide insights into the sorption/desorption of chemicals in and out of plastics, the mechanisms and kinetics, but also the scale of the concentrations of chemicals found in marine debris, particularly in microplastics. The occurrence of the various chemicals is analyzed, as well as the distribution profiles of the chemicals in microplastics throughout the world’s oceans. The implications of the fact that plastics carry within them several chemicals are discussed in detail. In closing, new research topics that warrant further attention are identified. The book will appeal to all scientists who are already working or interested in starting to work on the topic of marine debris, as well as policymakers, NGOs and the broader informed public.