scholarly journals A Turn-On Fluorescence-Based Fibre Optic Sensor for the Detection of Mercury

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2142 ◽  
Author(s):  
T. Hien Nguyen ◽  
Tong Sun ◽  
Kenneth T. V. Grattan
Keyword(s):  
Aqueous Media ◽  
Fibre Surface ◽  
Coumarin Derivative ◽  
In Situ Monitoring ◽  
Design Development ◽  
Buffer Solution ◽  
Quality Performance ◽  
Optical Fibre Sensor ◽  
Crown Ether Moiety ◽  
Photo Stability

The design, development, and evaluation of an optical fibre sensor for the detection of Hg2+ in aqueous media are discussed in detail in this paper. A novel fluorescent polymeric material for Hg2+ detection, based on a coumarin derivative (acting as the fluorophore) and an azathia crown ether moiety (acting as the mercury ion receptor), has been synthesized. The fluorophore was covalently immobilized onto the fibre surface by polymerisation using the ion imprinting technique and exhibited a significant increase in fluorescence intensity in response to Hg2+ via a photoinduced electron transfer (PET) mechanism. The sensor provided a response over a concentration range of 0–28 µM with an acceptable response rate of around 11 min and a recovery rate of around 30 min in a Tris-EDTA buffer solution. A detection limit of 0.15 µM was obtained with a possibility of improvement by changing the thickness of the polymer layer and using a more sensitive detector. High-quality performance is seen through a high selectivity for Hg2+ over other metal ions, excellent photo-stability and reversibility which was also demonstrated, making this type of sensor potentially well suited for in-situ monitoring of mercury in the environment.

In-situ monitoring of carbon dioxide emissions from a diesel engine using a mid-infrared optical fibre sensor

2011 ◽  
Author(s):  
Elfed Lewis ◽  
John Clifford ◽  
Colin Fitzpatrick ◽  
Gerard Dooly ◽  
Weizhong Zhao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Diesel Engine ◽  
Optical Fibre ◽  
Carbon Dioxide Emissions ◽  
In Situ Monitoring ◽  
Mid Infrared ◽  
Optical Fibre Sensor ◽  
Fibre Sensor

Effect of CMP Pad Exposure to Aqueous Media on the Pad Properties. Part 1. Dynamic Mechanical and Modulated DSC Analysis

2002 ◽  
Vol 732 ◽  
Author(s):  
A. Tregub ◽  
M. Moinpour ◽  
J. Sorooshian
Keyword(s):  
Aqueous Media ◽  
Mechanical Analysis ◽  
Fickian Diffusion ◽  
Modulated Dsc ◽  
Buffer Solution ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Dynamic Mechanical ◽  
Ph Buffer Solution ◽  
Ph Buffer

AbstractSoaking of polyurethane-based CMP pad in oxide slurry, de-ionized water, and pH buffer solution, and its effect on thermal and mechanical properties of the pads was studied using Dynamic Mechanical Analysis and Modulated Differential Scanning Calorimetry. Pad softening due to soaking was established, and softening mechanisms are discussed. Diffusion of the aqueous medias to polyurethane pad was described using Fickian diffusion model.

scholarly journals Development of an Aptamer Based Luminescent Optical Fiber Sensor for the Continuous Monitoring of Hg2+ in Aqueous Media

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2372 ◽  
Author(s):  
Nerea De Acha ◽  
César Elosúa ◽  
Francisco J. Arregui
Keyword(s):  
Optical Fiber ◽  
Aqueous Solutions ◽  
Limit Of Detection ◽  
Tap Water ◽  
Aqueous Media ◽  
Optical Fiber Sensor ◽  
Fluorescence Emission ◽  
Fiber Sensor ◽  
Buffer Solution ◽  
Fluorescence Quencher

A fluorescent optical fiber sensor for the detection of mercury (Hg2+) ions in aqueous solutions is presented in this work. The sensor was based on a fluorophore-labeled thymine (T)-rich oligodeoxyribonucleotide (ON) sequence that was directly immobilized onto the tip of a tapered optical fiber. In the presence of mercury ions, the formation of T–Hg2+-T mismatches quenches the fluorescence emission by the labeled fluorophore, which enables the measurement of Hg2+ ions in aqueous solutions. Thus, in contrast to commonly designed sensors, neither a fluorescence quencher nor a complementary ON sequence is required. The sensor presented a response time of 24.8 seconds toward 5 × 10−12 M Hg2+. It also showed both good reversibility (higher than the 95.8%) and selectivity: the I0/I variation was 10 times higher for Hg2+ ions than for Mn2+ ions. Other contaminants examined (Co2+, Ag+, Cd2+, Ni2+, Ca2+, Pb2+, Mn2+, Zn2+, Fe3+, and Cu2+) presented an even lower interference. The limit of detection of the sensor was 4.73 × 10−13 M Hg2+ in buffer solution and 9.03 × 10−13 M Hg2+ in ultrapure water, and was also able to detect 5 × 10−12 M Hg2+ in tap water.

Monitoring Alcohol and other Drug Treatment: What Would an Optimal System Look Like?

2009 ◽  
Vol 36 (3-4) ◽  
pp. 545-574 ◽  
Author(s):  
Brian Rush ◽  
Larry Corea ◽  
Garth Martin
Keyword(s):  
Information Systems ◽  
Drug Treatment ◽  
Open Systems ◽  
Quality Data ◽  
Design Development ◽  
Services Research ◽  
Quality Performance ◽  
Treatment Services ◽  
Treatment Information ◽  
Wide Range

This article focuses on the state of the art in the design, development, Operation and evaluation of information systems intended to monitor the delivery of specialized alcohol and drug treatment services. We draw particular attention to the conceptual frameworks that guide an overall treatment information system and that can serve as a template for planning new systems or reviewing existing ones. Several key principles are articulated including an open systems perspective to help manage change; active participation and buy-in from a wide range of key stakeholders; and a heavy emphasis on utilization (influence) of the results. We also highlight the ways in which an alcohol and drug services research agenda might intersect with these information systems and consider alternative frameworks for describing use of the information they produce. Supports must be provided at multiple levels in the provider agencies and on an ongoing basis in order to address low capacity for entering quality data at the provider level. The research community should play an important role in helping frame the questions these systems can (and cannot) address; developing high quality performance indicators; supporting innovative local and central data analysis; and reporting aspects of the data of broad interest from a research and health policy perspective.

A water-soluble sulfonate-BODIPY based fluorescent probe for selective detection of HOCl/OCl−in aqueous media

The Analyst ◽  
2014 ◽  
Vol 139 (12) ◽  
pp. 2986-2989 ◽  
Author(s):  
Jiyoung Kim ◽  
Youngmi Kim
Keyword(s):  
Electron Transfer ◽  
Fluorescent Probe ◽  
Fluorescence Intensity ◽  
Photoinduced Electron Transfer ◽  
Aqueous Media ◽  
Water Soluble ◽  
Selective Detection ◽  
Buffer Solution ◽  
Aqueous Buffer ◽  
Aqueous Buffer Solution

A water-soluble sulfonate-BODIPY dye1was developed for the selective detection of HOCl/OCl−in aqueous buffer solution. The probe, which displays extremely weak fluorescence owing to efficient photoinduced electron transfer (PeT) from the pendant catechol donor, responds to HOCl/OCl−through a dramatic enhancement of its fluorescence intensity.

Ratiometric fluorescent probe for Al3+ based on coumarin derivative in aqueous media

2015 ◽  
Vol 7 (5) ◽  
pp. 2036-2040 ◽  
Author(s):  
Jing-can Qin ◽  
Zheng-yin Yang
Keyword(s):  
Charge Transfer ◽  
Fluorescent Probe ◽  
Aqueous Media ◽  
Coumarin Derivative ◽  
Internal Charge Transfer ◽  
Internal Charge ◽  
Ratiometric Fluorescent Probe

In this study, a novel ratiometric chemosensor for Al3+ (HL) which contains coumarin and naphthalene moieties has been designed and synthesized on the basis of the mechanism of internal charge transfer (ICT).

Graphene nanosheets as a sensing platform for amplified electrochemical measurement of quercetin and uric acid in biological fluids

2014 ◽  
Vol 92 (11) ◽  
pp. 1074-1080 ◽  
Author(s):  
Majid Arvand ◽  
Mohsen Anvari
Keyword(s):  
Uric Acid ◽  
Simultaneous Determination ◽  
Graphene Nanosheets ◽  
Biological Fluids ◽  
Aqueous Media ◽  
Buffer Solution ◽  
Solution Ph ◽  
Citrate Buffer ◽  
Sensing Platform

A simple and selective electrochemical method was investigated for the simultaneous determination of quercetin (Qu) and uric acid (UA) in aqueous media (citrate buffer solution, pH 4.0) on a glassy carbon electrode modified with graphene nanosheets as a sensing platform (GNSs/GCE). Cyclic voltammetry, transmission electron microscopy, and Fourier transform infrared spectroscopy were employed to characterize the nanostructure of the sensor. Separation of the oxidation peak potentials for Qu and UA was about 160 mV, and the anodic currents for the oxidation of both Qu and UA are greatly increased at GNSs/GCE, which makes it suitable for simultaneous determination of these compounds. The detection limits were 0.0011 and 0.0137 μmol/L for Qu and UA, respectively. The method was applied to the determination of Qu and UA in human blood serum and urine samples.

Results of pilot comparisons of national standards for the activity of hydrogen ions in aqueous solutions

2021 ◽  
pp. 66-72
Author(s):  
Sergey V. Prokunin ◽  
Andrey N. Shchipunov ◽  
Daria A. Vengina ◽  
Frank Bastkowskiy ◽  
Emrah Uysal ◽  
...  
Keyword(s):  
Ph Value ◽  
Aqueous Media ◽  
Phosphate Buffer Solution ◽  
Hydrogen Index ◽  
National Standards ◽  
Measuring Instruments ◽  
Buffer Solution ◽  
Working Standard ◽  
Average Value ◽  
State Register

The enormous needs in ensuring the measurement of the hydrogen index in various industries and the national economy of Russia make the measurement of the hydrogen index one of the most important methods for monitoring aqueous media. In 2013, work was carried out to enter into the State Register of Measuring Instruments of the Russian Federation a buffer solution and a standard titer with a pH value of 7.00 – a working pH standard of the 2nd category, which is one of the most demanded of non-standard solutions for verification and calibration pH measuring instruments. To confirm the metrological characteristics, pilot comparisons were organized within COOMET. This article presents the results of a pilot comparison to determine the pH of a phosphate buffer solution – a working standard of рН=7.00. 8 metrological institutes and 10 metrological organizations took part in the comparisons. The results obtained showed that the overwhelming majority of the participants in the comparisons presented the results of pH measurements, which have an uncertainty not exceeding ±0.03 of the average value, which is an acceptable criterion for measuring the pH.

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