3 edition of The Adsorption of chlorinated hydrocarbon pesticides on an unconsolidated aquifer substrate found in the catalog.
The Adsorption of chlorinated hydrocarbon pesticides on an unconsolidated aquifer substrate
Francis Richard Boucher
|Series||PhD thesis, 1968|
|The Physical Object|
These sources have caused the emergence of numerous toxic and fatal contaminants in the groundwater like the chlorinated compounds, hydrocarbons, heavy metals, etc., which have gathered worldwide. RC An Investigation of the Chlorinated Hydrocarbon Substrate Range of the Filamentous Fungus, Graphium sp. RC Aerobic Cometabolism of Chloroform, 1,1,1-trichloroethane, 1,1-dichloroethylene, and Other Chlorinated Aliphatic Hydrocarbons by .
adsorption on sawdust (%) observed, after 30 min. Then, the mean concentration of PAHs was calculated per unit of the mass of adsorbents at the end of experiments and revealed; time is the effective factor on adsorption values. The adsorption coefficient was calculated as , and on rice bran, sawdust and activated. However, contaminant occurrences in confined aquifers were observed since the 's, often involving chlorinated hydrocarbons as dense non-aqueous phase liquids (DNAPL) in the source zones (e.g.
Adsorption equilibria of dichloromethane, 1,1,1-trichloroethane, and trichloroethylene on activated carbon were obtained by a static volumetric technique. Isotherms were measured for the pure vapors in the temperature range from to K and pressures up to 60 kPa for dichloromethane, 16 kPa for 1,1,1-trichloroethane, and 7 kPa for trichloroethylene, respectively. CHLORINATED HYDROCARBON PESTICIDES IN MAJOR U.S. RIVER BASINS. WEAVER L, GUNNERSON CG, BREIDENBACH AW, LICHTENBERG JJ. PMCID: PMC PMID: [PubMed - indexed for MEDLINE] MeSH Terms. Chemistry Techniques, Analytical* DDT* Dieldrin* Hydrocarbons, Chlorinated* Insecticides* Lindane* Manufactured Materials* Pesticides* Rivers Cited by:
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Put resin in a metal container having a 60 mesh screen bottom and wash out the fines with 20 bed volumes of tap water, followed by a distilled water rinse. Extract the resin in a Soxhlet apparatus with pesticide grade acetonitrile for 18 hours.
Change the solvent and repeat for another 18 hours. Adsorption of five one- and two-carbon chlorinated hydrocarbons onto a sandy loam was measured at 21°C and several soil water contents. Water contents varied from 0% (oven-dried) to 46% (field capacity), on a dry weight basis.
Adsorption capacity and heat of adsorption varied with soil water content as well as sorbate by: be gradual because pesticide molecules have to diffuse through the water.
film before the adsorption takes place on the particle surface. The equilibrial adsorption of dieldrin and heptachlor by humic acids. and leonardite is generally in well accord with the Freundlich by: 1. Carbon Adsorption Samples In the examination of CCE for chlorinated hydrocarbon pesticides by the procedure outlined, it is demonstrated that the pesticide: 1—is adsorbed on carbon, 2—is desorbed with chloroform, 3—is ether soluble, 4—is not water soluble, 5—is not acidic, 6—is not basic, 7—is neutral, 8—is benzene soluble, 9—moves on TLC in the same fashion as a given standard, 10—is.
After the pesticides had been adsorbed on the. clays, desorption of the pesticides occurred only to a very small extent. It is believed that the uptake of the organochlorine insecticides by the.
clay minerals is a process of chemical adsorption which involves the. formation of. The results and a numerical simulation of studies on dynamics of the adsorption from seven-component aqueous solution of light chlorinated hydrocarbons on activated carbon have been presented.
Aqueous solution of 1,2-dichloroethane (12DCE), 1,1,2,2-tetrachloroethane (S-TET), chloroform (CHCl 3), carbon tetrachloride (CCl 4), 1,1 Cited by: However, the quantity of chlorinated hydrocarbons adsorbed per unit mass of CeO 2-NP/AC was increased as the initial concentration of chlorinated hydrocarbons was increased.
This was attributed to the increase in mass transfer between the solution and the adsorbent by virtue of concentration factor, a driving force in the adsorption process (Garg,Selvi et al., ).Cited by: 4.
This review will discuss the methods which have been and are currently being used to extract chlorinated hydrocarbon insecticides from crops. Further, it will point out the possible limitations of these methods particularly when they are applied to crops containing internal by: 5. The volumes of chlorinated hydrocarbons injected into the column ranged from to μl.
Adsorption measurements were performed at temperatures ofand K. It was corrected for the pressure drop of the fittings, which was obtained from measurements using an empty by: 7.
26 Valičková M. et al., Removal of selected pesticides by adsorption vated sludge were used. g of GAC and g of zeolite with a particle size fractions d = to mm was applied. liter of activated sludge with the concentration of X = g/l was used for these adsorption experiments.
Analytical methods. Key wordschlorinated hydrocarbon, lindane, aldrin, heptachlor, DDT, dieldrin, ct-hexachlorocyclo- hexane, sorption, water purification INTRODUCTION Biological removal of chlorinated organic com- pounds from water either by biodegradation or sorp- tion to microbial cells has received little attention when compared with physical and chemical processes for water by: THE ANAEROBIC DEGRADATION OF SELECTED CHLORINATED HYDROCARBON PESTICIDES by David W.
Hill* and Perry L. McCarty Respectively, Doctoral Candidate and Associate Professor of Sanitary Engineering Department of Civil Engineering Stanford University Stanford, California *Now a Research Sanitary Engineer with the Federal Water Pollution Control.
Methoxychlor: Methoxychlor is one of the safest chlorinated hydrocarbon insecticides and one of the few with active registration in the USA. The oral LD 50 in rats is 5, mg/kg, and the dermal LD 50 in rabbits is 2, mg/kg.
Young dairy calves tolerate mg/kg; mg/kg is mildly toxic. Heterogeneity of chlorinated hydrocarbon sorption properties in a sandy aquifer Article in Journal of Contaminant Hydrology 78(4) September with 92 Reads How we measure 'reads'. PDF | On Jan 1,Michelle M Lorah and others published Characterization of preferential ground-water seepage from a chlorinated hydrocarbon-contaminated aquifer to West Branch Canal Creek.
This chapter reviews the application of additives used in bioremediation of chlorinated solvents and fuels for groundwater and soil remediation. Soluble carbon substrates are applicable to most site conditions except aquifers with very high or very low groundwater flow.
Slow-release and solid substrates are intended to be long-lasting in supplying carbon for microbial growth thereby minimizing Cited by: 1. Assessing aquitard integrity in a complex aquifer – aquitard system contaminated by chlorinated hydrocarbons Article in Water Research December.
Treatment of Chlorinated Hydrocarbon Contaminated Groundwater with Injectable Nanoscale Bimetallic Particles unlimited. Environmental Security Technology Certification Program (ESTCP) Treatment of Chlorinated Hydrocarbon Contaminated Groundwater with Injectable Nanoscale Bimetallic Particles scales such as aquifer simulation “sand box.
Understanding Chlorinated Hydrocarbon Behavior in Groundwater: Investigation, Assessment and Limitations of Chlorinated hydrocarbon movement in the subsurface Chlorinated hydrocarbons degrade through different pathways and under different conditions than petroleum.
Understanding of chlorinated hydrocarbon degradation andFile Size: KB. Non-competitive adsorption of polycyclic aromatic hydrocarbons (PAHs) from water onto activated carbon was studied alongside the performance of CO 2-activated petroleum coke as a low-cost adsorbent.
PAH adsorption was a two-stage process: a short, fast initial period followedCited by: 9. Method Chlorinated Hydrocarbons Promulgated APPENDIX A TO PART METHODS FOR ORGANIC CHEMICAL ANALYSIS OF MUNICIPAL AND INDUSTRIAL WASTEWATER. METHOD —CHLORINATED HYDROCARBONS. 1. Scope and Application. This method covers the determination of certain chlorinated hydrocarbons.
The. Adsorption dynamics of chlorinated hydrocarbons from multi-component aqueous solution onto activated carbon.
Pełech R(1), Milchert E, Wróbel R. Author information: (1)Institute of Chemical Organic Technology, Szczecin University of Technology, Pulaski Szczecin, Poland. @d by: Carbon nanomaterials are novel manufactured materials, having widespread potential applications.
Adsorption of hydrophobic organic compounds (HOCs) by carbon nanomaterials may enhance their toxicity and affect the fate, transformation, and transport of HOCs in the environment.
In this research, adsorption of naphthalene, phenanthrene, and pyrene onto six carbon nanomaterials, including Cited by: