Time weighted average concentration monitoring of compounds with wide range of physicochemical properties in aquatic environment using thin film solid phase microextraction

Boyacı, Ezel
Ahmadi, Fardin
Pawliszyn, Janusz
This study offers an integrated approach for time weighted average (TWA) concentration determination of analytes with a wide range of physical-chemical properties. Two types of thin film solid phase microextraction (TF-SPME) passive sampler, namely a retracted TF-SPME device using a hydrophilic lipophilic balance (HLB) sorbent and an open bed configuration TF-SPME device with octadecyl silica-based (C18) sorbent were developed and used for monitoring TWA concentrations of selected UV blockers and biocides. Laboratory calibration results indicated that the thin film retracted device using HLB sorbent is suitable to determine TWA concentrations of hydrophilic analytes in water and uptake was linear up to 70 days. In open bed form, a one-calibrant kinetic calibration technique was accomplished by loading Benzophenone 3-d5 as calibrant on the C18 coating to quantify all hydrophobic compounds. The experimental results showed that the one-calibrant kinetic calibration technique can be used for determination of classes of compounds in cases where deuterated counterparts are either not available or expensive. The developed passive samplers were used in field trials which indicated that these devices are suitable for long-term and short-term monitoring of compounds varying in polarity.


Temporal variations and sources of organic pollutants in two urban atmopsheres: Ankara and Ottawa
Oğuz Kuntasal, Öznur; Tuncel, Süleyman Gürdal; Department of Environmental Engineering (2005)
This study aimed at providing a thorough understanding of temporal and spatial variations of VOCs and underlying factors in different microenvironments in two different urban atmospheres, with different degrees of regulatory enforcement. The VOC data were collected in field campaigns conducted in Ankara, Turkey, and Ottawa, Canada over the years 2000-2004. Insight into the sources of VOCs in different urban atmospheres was sought by using three commonly used receptor models namely; Positive Matrix Factoriza...
Comparison of Kalman filter and Bayesian-MAP approaches in the spatio-temporal solution of the inverse electrocardiography Ters elektrokardiyografinin zaman-uzamsal çözümünde Kalman filtre ve Bayes-MAP yöntemlerinin karşilaştirilmasi
Aydin, Ümit; Serinağaoğlu Doğrusöz, Yeşim (2010-07-15)
In this study some of the spatial and spatio-temporal methods for the solution of the inverse problem of electrocardiography (ECG) are compared with each other. Comparisons are also made for the cases with geometric errors, where the location of the heart is shifted for 10mm and the size of the heart is reduced by 5%. The compared methods are the Kalman filter and Bayesian maximum a posteriori estimation (MAP). Two different Bayesian-MAP algorithms are used. While one uses only spatial information the other...
Ünlü, Kahraman; BIGGAR, JW (1990-09-01)
A numerical experiment was designed to study the stochastic behavior of one‐dimensional transient unsaturated flow in a Monte Carlo setting. Soil hydraulic properties, log‐saturated hydraulic conductivity ln Ks, pore size distribution parameter α, and the specific water capacity C are assumed to be statistically homogeneous random fields described by exponential correlation functions with identical correlation lengths. Fifty realizations of each soil hydraulic property, with statistical properties obtained ...
Site Specific Relationship for Strain Dependent Shear Modulus and Damping Using In Situ V S and High Strain Cyclic Test Results
Zehtab, Kaveh Hassan; Yılmaz, Mustafa Tolga (2016-08-18)
This study suggests a practical method for estimating site-specific strain dependent shear modulus and damping. The method uses in-situ shear wave velocity measurements and commercial cyclic laboratory tests on higher strains (i.e., 0.5% to 1%) in which the effect of disturbance is less significant. Shear modulus calculated using in-situ shear wave velocity and at higher cyclic shear strain, is used for building a hyperbolic relationship for shear stress and strain. Modified Masing's rule and the experiment...
Performance comparisons of seismic assessment methods with PSD test results of a deficient RC frame
Ozcebe, G.; KURT, ELİF; Binici, Barış; Kurç, Özgür; Canbay, Erdem; Akpinar, U. (2009-12-01)
The accuracy of estimating the performance levels of a deficient RC frame using linear elastic and nonlinear dynamic analysis is evaluated in this study. This was achieved by comparing the response of a structure tested with pseudo-dynamic testing and estimated by the linear elastic assessment procedures along with nonlinear dynamic analysis. The test structure (three bay-two storey planar frame) is a 1/2 scale reinforced concrete frame having masonry infill walls in the central span. The test frame contain...
Citation Formats
E. Boyacı, F. Ahmadi, and J. Pawliszyn, “Time weighted average concentration monitoring of compounds with wide range of physicochemical properties in aquatic environment using thin film solid phase microextraction,” Chicago, Illinois, USA, 2017, p. 305, Accessed: 00, 2021. [Online]. Available: https://pittcon.org/2017/Pittcon-2017-Technical-Program.pdf.