scholarly journals Sensing Heavy Metals Using Mesoporous-Based Optical Chemical Sensors

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Špela Korent Urek ◽  
Nina Frančič ◽  
Matejka Turel ◽  
Aleksandra Lobnik
Keyword(s):  
Heavy Metal ◽  
Mesoporous Materials ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Limit Of Detection ◽  
Good Alternative ◽  
High Porosity ◽  
Optical Chemical Sensors ◽  
Materials Used

Heavy metal pollution is one of the more serious environmental problems; therefore, there is a constant demand for the development of new analytical tools for its monitoring. An optical chemical sensor represents a good alternative to classical instrumental methods. The mesoporous materials used in optical chemical sensors’ fabrications have properties such as high porosity, exceptional adsorption capacity, tuneable 3D shape, geometry, and morphology, which enable improved limit of detection, response time, and selectivity properties of optical sensors. In this review, we firstly present the properties of mesoporous materials, provide a brief description of sensing mechanisms, and briefly discuss the importance of continuous monitoring. Recent advances in those mesoporous silica-based optical sensors used for heavy metal detection have been reported and their advantages and limitations also discussed. This review covers publications that have appeared since 2008.

scholarly journals Wireless and mobile optical chemical sensors and biosensors

2018 ◽  
Vol 37 (4) ◽  
Author(s):  
Petar Kassal ◽  
Ema Horak ◽  
Marija Sigurnjak ◽  
Matthew D. Steinberg ◽  
Ivana Murković Steinberg
Keyword(s):  
Optical Sensors ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Current Trend ◽  
Original Research ◽  
Sensor Systems ◽  
Optical Chemical Sensor ◽  
Trade Offs ◽  
Optical Chemical Sensors ◽  
Personal Fitness

Abstract This review explores the current state-of-the-art wireless and mobile optical chemical sensors and biosensors. The review is organised into three sections, each of which investigates a major class of wireless and/or mobile optical chemical sensor: (i) optical sensors integrated with a radio transmitter/transceiver, (ii) wearable optical sensors, and (iii) smartphone camera-based sensors. In each section, the specific challenges and trade-offs surrounding the (bio)chemical sensing mechanism and material architecture, miniaturisation, integration, power requirements, readout, and sensitivity are explored with detailed examples of sensor systems from the literature. The analysis of 77 original research articles published between 2007 and 2017 reveals that healthcare and medicine, environmental monitoring, food quality, and sport and fitness are the target markets for wireless and mobile optical chemical sensor systems. In particular, the current trend for personal fitness tracking is driving research into novel colourimetric wearable sensors with smartphone readout. We conclude that despite the challenges, mobile and wearable optical chemical sensor systems are set to play a major role in the sensor Internet of Things.

scholarly journals Integration and application of optical chemical sensors in microbioreactors

Lab on a Chip ◽  
2017 ◽  
Vol 17 (16) ◽  
pp. 2693-2712 ◽  
Author(s):  
Pia Gruber ◽  
Marco P. C. Marques ◽  
Nicolas Szita ◽  
Torsten Mayr
Keyword(s):  
Carbon Dioxide ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Optical Chemical Sensor ◽  
Optical Chemical Sensors

This tutorial review explains the integration of optical chemical sensor formats for the purpose of monitoring oxygen, pH, carbon dioxide, glucose and temperature in microbioreactors.

scholarly journals Commercial Polycarbonate Track-Etched Membranes as Optical Chemical Sensors

Proceedings ◽  
2018 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Paula Martínez-Pérez ◽  
Jaime García-Rupérez
Keyword(s):  
Refractive Index ◽  
Porous Materials ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Main Parameter ◽  
Refractive Index Sensing ◽  
Photonic Structures ◽  
New Material ◽  
Optical Chemical Sensors

Refractive index is the main parameter measured by current optical sensors. Among all the photonic structures available for their design, porous materials have become an excellent option, since they provide better sensitivities. In our work, commercially available polycarbonate track-etched membranes were used as porous photonic structures. By means of reflectivity measurements, we demonstrated their capability to detect the presence of ethanol in the medium and showed the possibility of reusing them in several sensing assays. This new material could become an easier-to-obtain and cheaper alternative to current porous materials commonly used in optical sensors for refractive index sensing.

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽  
2015 ◽  
Vol 44 (5) ◽  
pp. 355-362 ◽  
Author(s):  
Marie Urban ◽  
Alban Fouasson-Chailloux ◽  
Isabelle Signolet ◽  
Christophe Colas Ribas ◽  
Mathieu Feuilloy ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Transcutaneous Oxygen ◽  
Starting Values ◽  
Two Systems ◽  
Transcutaneous Oxygen Pressure ◽  
New Sensors ◽  
Changes Over Time ◽  
Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

Recent Trends in Development of Nanomaterials Based Green Analytical Methods for Environmental Remediation

2020 ◽  
Vol 16 ◽  
Author(s):  
Sidra Amin ◽  
Amber R. Solangi ◽  
Dilawar Hassan ◽  
Nadir Hussain ◽  
Jamil Ahmed ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Environmental Remediation ◽  
Environmental Chemistry ◽  
Limit Of Detection ◽  
Environmental Pollutants ◽  
Toxic Metal ◽  
Electrochemical Analysis ◽  
Good Choice ◽  
Nano Materials ◽  
Limit Of Quantification

Background: In recent years, the occurrence and fate of environmental pollutants has been recognized as one of the emerging issues in environmental chemistry. A survey documented about a wide variety of these pollutants, which are often detected in our environment and these are major cause of shortened life spans and the global warming. These pollutants include toxic metal, pesticides, fertilizers, drugs and dyes released into soil and major water bodies. The presence of these contaminants causes major disturbance in eco-system’s balance. To tackle these issues many technological improvements are made to detect minute contaminations. The latest issue being answered by the scientists is the use of green nano materials as sensors which are economical, instant and give much better results at low concentrations and can be used for the field measurements resulting in no dangerous by-product that could lead to more environmental contamination. Nano materials are known for their wide band gap, enhanced physical and optical properties with option of tuneablity as per need, by optimizing certain parameters. They are proved to be good choice for analytical/optical sensors with high sensitivity. Objective: This review holds information about multiple methods that use green nanomaterials for the analytical assessment of environmental pollutants. UV-Vis spectrophotometry and electrochemical analysis using green and reproducible nanomaterials are the major focus of this review article. To date, there are number of spectrophotometric and electro chemical methods available that have been used for the detection of environmental pollutants such as toxic metals, pesticides and dyes. Conclusion: The use of nanomaterials can drastically change the detection limits due to having large surface area, strong catalytic properties, and tunable possibility. With the use of nano materials, lower than the marked limit of detection and limit of quantification were seen when compared with previously reported work. The used nano-materials could be washed, dried, and reused, which makes the methods more proficient, cost effective and environmentally friendly.

scholarly journals A Short Review on Recent Advances of Hydrogel-Based Adsorbents for Heavy Metal Ions

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 864
Author(s):  
Suguna Perumal ◽  
Raji Atchudan ◽  
Thomas Nesakumar Jebakumar Immanuel Edison ◽  
Rajendran Suresh Babu ◽  
Petchimuthu Karpagavinayagam ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Large Scale ◽  
Water Bodies ◽  
Dimensional Structure ◽  
High Porosity ◽  
Adsorption Method ◽  
Toxic Heavy Metal ◽  
Practical Applications

The growth of industry fulfills our necessity and promotes economic development. However, pollutants from such industries pollute water bodies which pose a high risk for living organisms. Thus, researchers have been urged to develop an efficient method to remove toxic heavy metal ions from water bodies. The adsorption method shows promising results for the removal of heavy metal ions and is easy to operate on a large scale, thus can be applied to practical applications. Numerous adsorbents were developed and reported, among them hydrogels, which attract great attention because of the reusability, ease of preparation, and handling. Hydrogels are generally prepared by the cross-linking of polymers that result in a three-dimensional structure, showing high porosity and high functionality. They are hydrophilic in nature because of the functional groups, and are non-toxic. Thus, this review provides various methods of hydrogel adsorbents preparation and summarizes recent progress in the use of hydrogel adsorbents for the removal of heavy metal ions. Further, the mechanism involved in the removal of heavy metal ions is briefly discussed. The most recent studies about the adsorption method for the treatment of heavy metal ions contaminated water are presented.

Porous silicon microcavities as optical chemical sensors

2000 ◽  
Vol 76 (18) ◽  
pp. 2523-2525 ◽  
Author(s):  
V. Mulloni ◽  
L. Pavesi
Keyword(s):  
Porous Silicon ◽  
Chemical Sensors ◽  
Optical Chemical Sensors

scholarly journals Microwave Assisted DNA Hydrolysis for Global Methylation Analysis by Gas Chromatography/Tandem Mass Spectrometry

2018 ◽  
Vol 62 (2) ◽  
Author(s):  
Karla Viridiana Castro-Cerritos ◽  
Julio Cesar Torres-Elguera ◽  
Jaqueline Capataz-Tafur ◽  
Erick Adrian Juarez-Arellano ◽  
Adolfo Lopez-Torres
Keyword(s):  
Dna Methylation ◽  
Large Scale ◽  
Limit Of Detection ◽  
Multiple Reaction Monitoring ◽  
Good Alternative ◽  
Detection Methods ◽  
Mass Analyzer ◽  
Global Methylation ◽  
Epigenetic Events ◽  
Methylation Patterns

<div><p class="Abstract">The analysis of the global DNA methylation, calculated as the percentage of 5-methylcytosine (5mC) over the total sum of cytosines, is a well stablished biomarker for monitoring large scale epigenetic events in organisms. DNA purification, hydrolysis, separation and detection methods are critical steps to determine this biomarker. In the present work is proposed a robust procedure for DNA acid-hydrolysis assisted by microwave that provides identical DNA methylation patterns that enzymatic hydrolysis and better release of 5mC than acid classic method. The quantification was performed using a gas chromatographer coupled to a mass spectrometer with triple quadrupole as mass analyzer (GC-TQ-MS/MS) using multiple reaction monitoring (MRM) mode for the trimethylsilyl-derivates of nucleobases; following the transitions of 254→238, 240→170 and 254→238, 254→184 (m/z) for C and 5mC respectively, was achieved a limit of detection of 0.46 fmol for C and 0.41 fmol for 5mC. The proposed procedure is capable of determine 0.004% of 5mC in 50 ng of DNA in a chromatographic time of 10 minutes, being a good alternative to LC-MS/MS analysis.</p></div>

scholarly journals Integration of New Sol-Gel Films Into Optical Chemical Sensors

2016 ◽  
Vol 168 ◽  
pp. 333-336 ◽  
Author(s):  
E. Scolan ◽  
R. Smajda ◽  
G. Weder ◽  
G. Voirin ◽  
R. Pugin ◽  
...  
Keyword(s):  
Chemical Sensors ◽  
Sol Gel ◽  
Optical Chemical Sensors ◽  
Sol Gel Films
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