A contaminant transport model was developed to simulate the fate and transport of organic compounds such as TNT (2,4,6-trinitrotoluene), using the single-root system. Onions were planted for this system with 50-ml plastic tubes. Mass in the soil, soil solution, root and leaf was monitored using 14C-TNT. Model parameters were acquired from the experiments in the single-root system and were used to simulate total TNT concentration in soil, providing the average concentrations in the rhizosphere and bulk soil as well as root and leaf compartments. Because the existing RCF (root concentration factor) and TSCF (transpiration stream concentration factor) equations based on logKow (octanol-water partition coefficient) were not correlated to TNT uptake, a new term, root uptake rate (Rur), and a new Tscf equation, based on the experimental data, were introduced in the proposed model. The results from both modeling and experimental studies showed higher concentrations of TNT in the rhizosphere than in the bulk soil, because mass transported from the surrounding soil into the rhizosphere was higher than that by root uptake.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.envpol.2004.02.026 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparison of the effect of different irrigation activation systems on the amount of apical extrusion of irrigation solution in teeth with severely curved canals.
Lasers Med Sci
January 2025
Department of Endodontics, Faculty of Dentistry, Gülhane Faculty of Dentistry, University of Health Sciences, Ankara, Turkey.
Objective: This study aims to quantitatively compare the effects of standard needle irrigation (SNI), passive ultrasonic irrigation (PUI), EDDY, photon-initiated photoacoustic streaming (PIPS), and shock wave-enhanced emission photoacoustic streaming (SWEEPS) on the apical extrusion of irrigation solutions in teeth with severe canal curvature.
Materials And Methods: Seventy-five teeth with a single root and canal, and curvature angles ranging from 20° to 40°, were selected for this study. Root canal curvatures were measured from buccolingual and mesiodistal radiographs using ImageJ software (version 1.
Exploring the Potential of Nitrofurantoin for Infection Control in Regenerative Endodontics: In Vitro Study.
J Endod
December 2024
Postgraduate Program in Dentistry of Fluminense Federal University (UFF), Niteroi, Rio de Janeiro, Brazil; Geriatric Dentistry Department, Faculty of Dentistry of Fluminense Federal University (UFF), Niteroi, Rio de Janeiro, Brazil; Laboratory of Experimental Culture Cell (LECCel), Faculty of Dentistry of Fluminense, Federal University (UFF), Niteroi, Rio de Janeiro, Brazil; Endodontics Department, Faculty of Dentistry of Fluminense Federal University (UFF), Niteroi, Rio de Janeiro, Brazil. Electronic address:
Introduction: This study assessed a new antimicrobial paste formulation containing nitrofurantoin for regenerative endodontics against multispecies biofilms.
Methods: Four groups of 11 single-root teeth each were tested: Negative control group (brain-heart infusion broth + micro-organisms); Hoshino 1 conventional tri-antibiotic paste group (1:1:1 ratio); Hoshino 5 group (5:5:5 ratio); Experimental group with nitrofurantoin, ciprofloxacin, and metronidazole. Minimum inhibitory concentrations of each antimicrobial were determined.
Endodontic Management of Failed Root Canal Treatment in Teeth With Previously Missed Canals: A Report of Two Cases With Rare Root Canal Morphology.
Cureus
November 2024
Department of Conservative Dental Sciences, College of Dentistry, Qassim University, Buraydah, SAU.
Teeth may exhibit a wide range of anatomical variations in their roots and root canal systems, making them challenging to treat in endodontic procedures. Generally, maxillary canines and mandibular premolars present with a single root with one canal, and variations are comparatively rare. Achieving a fluid-impervious seal in endodontic therapy requires thorough debridement and three-dimensional obturation of the root canal system, which is considered a complex micro-neurologic procedure.
View Article and Find Full Text PDFEvaluation of root canal morphology of mandibular premolars in Pakistani population using the new classification: a CBCT study.
BMC Oral Health
November 2024
Department of Surgery, Aga Khan University, Karachi, Pakistan.
Background: A comprehensive understanding of the root form and canal anatomy is essential for successful endodontic treatment. This study aimed to evaluate the root canal anatomy of mandibular premolars in the Pakistani population using cone beam computed tomography (CBCT) and to classify the findings with the new classification proposed by Ahmed et al. METHODS: Ethical exemption was obtained from Aga Khan University Hospital, Karachi.
View Article and Find Full Text PDFTranscriptomics integrated with targeted metabolomics reveals endogenous hormone changes in tuberous root expansion of Pueraria.
BMC Genomics
November 2024
College of Agronomy, Jiangxi Agricultural University, Nanchang, 330045, China.
Background: Pueraria is a widely cultivated medicinal and edible homologous plant in Asia, and its tuberous roots are commonly used in the food, nutraceutical, and pharmaceutical industries. "Gange No. 5" is a local variety of Pueraria montana var.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!