@article{MTMT:31254369,
	title = {Dissolved Carbon Dioxide Sensing Platform for Freshwater and Saline Water Applications: Characterization and Validation in Aquaculture Environments},
	url = {https://m2.mtmt.hu/api/publication/31254369},
	author = {Mendes, J. P. and Coelho, L. and Kovács, Barna and de, Almeida J. M. M. M. and Pereira, C. M. and Jorge, P. A. S. and Borges, M. T.},
	doi = {10.3390/s19245513},
	journal-iso = {SENSORS-BASEL},
	journal = {SENSORS},
	volume = {19},
	unique-id = {31254369},
	abstract = {A sensing configuration for the real-time monitoring, detection, and quantification of dissolved carbon dioxide (dCO(2)) was developed for aquaculture and other applications in freshwater and saline water. A chemical sensing membrane, based on a colorimetric indicator, is combined with multimode optical fiber and a dual wavelength light-emitting diode (LED) to measure the dCO(2)-induced absorbance changes in a self-referenced ratiometric scheme. The detection and processing were achieved with an embeded solution having a mini spectrometer and microcontroller. For optrode calibration, chemical standard solutions using sodium carbonate in acid media were used. Preliminary results in a laboratory environment showed sensitivity for small added amounts of CO2 (0.25 mg.L-1). Accuracy and response time were not affected by the type of solution, while precision was affected by salinity. Calibration in freshwater showed a limit of detection (LOD) and a limit of quantification (LOQ) of 1.23 and 1.87 mg.L-1, respectively. Results in saline water (2.5%) showed a LOD and LOQ of 1.05 and 1.16 mg.L-1, respectively. Generally, performance was improved when moving from fresh to saline water. Studies on the dynamics of dissolved CO2 in a recirculating shallow raceway system (SRS+RAS) prototype showed higher precision than the tested commercial sensor. The new sensor is a compact and robust device, and unlike other sensors used in aquaculture, stirring is not required for correct and fast detection. Tests performed showed that this new sensor has a fast accurate detection as well as a strong potential for assessing dCO(2) dynamics in aquaculture applications.},
	keywords = {SYSTEMS; PERFORMANCE; Aquaculture; SENSOR; Electrodes; Chemistry, Analytical; optical sensor; OPTODES; Engineering, Electrical & Electronic; Optical fiber; chemical optrode; dissolved carbon dioxide},
	year = {2019},
	eissn = {1424-8220}
}

@inproceedings{MTMT:3360861,
	title = {New developments on fibre optic colorimetrie sensors for dissolved CO2 in aquatic environments},
	url = {https://m2.mtmt.hu/api/publication/3360861},
	author = {Coelho, L and Pereira, C and Mendes, J and De Almeida, J M M M and Kovács, Barna and Balogh, K and Borges, T and Jorge, P A S},
	booktitle = {OCEANS 2017 - Aberdeen},
	doi = {10.1109/OCEANSE.2017.8084989},
	unique-id = {3360861},
	year = {2017}
}

@article{MTMT:2777545,
	title = {Direct chronoamperometric determination of free available chlorine in soil samples using built-in diffusion layer coated glassy carbon electrode},
	url = {https://m2.mtmt.hu/api/publication/2777545},
	author = {Kiss, László and Kovács, Barna and Nagy, Géza},
	doi = {10.1007/s10008-014-2596-7},
	journal-iso = {J SOLID STATE ELECTR},
	journal = {JOURNAL OF SOLID STATE ELECTROCHEMISTRY},
	volume = {19},
	unique-id = {2777545},
	issn = {1432-8488},
	abstract = {In this work, a glassy carbon electrode supplied with a built-in diffusion layer and a short-time chronoamperometric method were used for obtaining reliable concentration values from I-t curves recorded in tortuous media. It was proved that short-time chronoamperometric transients taken with the modified electrode in tortuous matrices can be evaluated using calibrating data recorded in simple aqueous standards. The applicability of the in situ analytical method was tested for determination of active chlorine concentration in different bleaching powder treated soil samples. Iodometric titrations were employed for comparison. The results prove that residual concentration of active chlorine can be estimated with 0.66 % relative standard deviation using the proposed in situ chronoamperometric measuring methods in humid soil slurry after bleaching powder disinfection. © 2014 Springer-Verlag Berlin Heidelberg.},
	keywords = {SOIL; Chronoamperometry; Calcium hypochlorite; Built-in diffusion layer; Bleaching powder},
	year = {2015},
	eissn = {1433-0768},
	pages = {261-267}
}

@article{MTMT:2848643,
	title = {Direct Voltammetric Determination of Ascorbic Acid in Natural Paprika Fruits Without Sample Pretreatment},
	url = {https://m2.mtmt.hu/api/publication/2848643},
	author = {Őri, Zsuzsanna Emese and Nagy, Lívia and Kiss, László and Kovács, Barna and Nagy, Géza},
	doi = {10.1002/elan.201400603},
	journal-iso = {ELECTROANAL},
	journal = {ELECTROANALYSIS},
	volume = {27},
	unique-id = {2848643},
	issn = {1040-0397},
	year = {2015},
	eissn = {1521-4109},
	pages = {808-816}
}

@article{MTMT:2777546,
	title = {Optical Ammonia Sensors for Environmental Applications},
	url = {https://m2.mtmt.hu/api/publication/2777546},
	author = {Markovics, Ákos and Kovács, Barna},
	doi = {10.1080/00032719.2013.843188},
	journal-iso = {ANAL LETT},
	journal = {ANALYTICAL LETTERS},
	volume = {47},
	unique-id = {2777546},
	issn = {0003-2719},
	abstract = {Triphenyl-methane based indicators bromophenol blue and bromocresol green were immobilized in ormosil sol-gel films prepared from phenyl-triethoxysilane in order to prepare colorimetric ammonia sensors. The sensing layers contained different molar ratios of the indicators, in this way-depending on the pKa values of the indicators-sensors with tailored dynamic ranges could be fabricated. Adsorption based immobilization was also used for the fabrication of chemical layers immersing anodized aluminum films in aqueous solutions of the indicators. Simultaneous immobilization of the indicators was considerably effortful on the anodized aluminum film, compared with the sol-gel film; therefore, the significant temperature dependency of the sensor response was used to shift the dynamic range. The effect of an ionic liquid additive was also investigated to increase the lifetime of these sensors. All sensors were tested spectrophotometrically, although a simple reflection based read-out device was also constructed using two light emitting diodes as light sources and two photodiodes as detectors. The device did not produce a concentration dependent signal but gave a digital yes or no (1 or 0) indicating that ammonia concentrations had reached a preset level. © 2014 Copyright Taylor and Francis Group, LLC.},
	keywords = {Optical ammonia sensor; Tunable sensor; Sensor read-out; Anodized aluminum},
	year = {2014},
	eissn = {1532-236X},
	pages = {465-477}
}

@article{MTMT:2777547,
	title = {Poly(luminol) based sensor array for determination of dissolved chlorine in water},
	url = {https://m2.mtmt.hu/api/publication/2777547},
	author = {Szili, Mónika and Kasik, I and Matejec, V and Nagy, Géza and Kovács, Barna},
	doi = {10.1016/j.snb.2013.10.080},
	journal-iso = {SENSOR ACTUAT B CHEM},
	journal = {SENSORS AND ACTUATORS B-CHEMICAL},
	volume = {192},
	unique-id = {2777547},
	issn = {0925-4005},
	abstract = {An optical sensor for determination of free chlorine content of drinking water was prepared and tested. The function of the sensor is based on detecting chemiluminescence signal provided by thin immobilized poly(luminol) reagent layer. The poly(luminol) reagent film was prepared by electropolymerization of luminol onto planar indium-tin-oxide (ITO) electrode. Different methods, like electrode potential cyclization (cyclic voltammetry, CV), pulsed potential electrolysis (pulsed amperometry, PA) and potentiostatic electrolysis (constant potential electrolysis, PSE) were employed for preparation of the poly(luminol) layer. The chemoluminescence (chemiluminescence) of the differently prepared films was investigated in the poly(luminol) - hypochlorite - hydrogen peroxide reaction. Highest luminescence signal was obtained by the films prepared with CV. Poly(luminol) layers deposited with pulsed potential showed 80% less luminescence while almost no signal was obtained in case of films made with constant potential technique. The effects of the buffer composition and pH on the analytical properties of the electro polymerized sensing layer were investigated. The lower concentration limit of free chlorine detection was 5 × 10-7 M in phosphate buffer at pH = 8.0. It was found that the chemiluminescence signal decreased significantly when hypochlorite concentrations over 1 mM were applied. An array of 24 micro wells was fabricated on ITO glass slab of about microscope slide size. The individual micro wells had identical volume and the poly(luminol) layer immobilized on their bottom had identical activity. The wells could be used for "single shot" determination of free chlorine content of drinking water. The long storage stability, the simple measurement procedure and low feasible concentration range makes the array an attractive analytical tool. Its applicability was proved measuring dissolved chlorine concentration of tap water samples. © 2013 Elsevier B.V. All rights reserved.},
	keywords = {sensors; DISSOLUTION; chlorine; Cyclic voltammetry; Film preparation; INDIUM; Electrolysis; chemiluminescence; electropolymerization; luminol; Tin oxides; Luminols; Potentiostatic electrolysis; Measurement procedures; Indium tin oxide electrodes; Hydrogen peroxide reaction; Constant potential electrolysis; Chlorine concentration; Analytical properties; Poly(luminol); Dissolved chlorine},
	year = {2014},
	eissn = {0925-4005},
	pages = {92-98}
}

@article{MTMT:2781072,
	title = {Characterization of a novel dissolved CO2 sensor for utilization in environmental monitoring and aquaculture industry},
	url = {https://m2.mtmt.hu/api/publication/2781072},
	isbn = {9780819496010},
	author = {Balogh, K and Jesusc, JM and Gouveia, C and Domingues, JO and Markovics, A and Baptista, JM and Kovács, Barna and Pereira, CM and Borges, M-T and Jorge, PAS},
	doi = {10.1117/12.2027518},
	journal-iso = {PROCEEDINGS OF SPIE},
	journal = {PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING},
	volume = {8785},
	unique-id = {2781072},
	issn = {0277-786X},
	year = {2013},
	eissn = {1996-756X},
	pages = {8785FC}
}

@article{MTMT:2364658,
	title = {Voltammetric concentration measurements in diffusion-hindered media},
	url = {https://m2.mtmt.hu/api/publication/2364658},
	author = {Kiss, László and Őri, Zsuzsanna Emese and Nagy, Lívia and Kovács, Barna and Nagy, Géza},
	doi = {10.1007/s10008-013-2178-0},
	journal-iso = {J SOLID STATE ELECTR},
	journal = {JOURNAL OF SOLID STATE ELECTROCHEMISTRY},
	volume = {17},
	unique-id = {2364658},
	issn = {1432-8488},
	year = {2013},
	eissn = {1433-0768},
	pages = {3039-3045}
}

@article{MTMT:2241729,
	title = {Fabrication of optical chemical ammonia sensors using anodized alumina supports and sol–gel method},
	url = {https://m2.mtmt.hu/api/publication/2241729},
	author = {Markovics, Ákos and Kovács, Barna},
	doi = {10.1016/j.talanta.2013.01.054},
	journal-iso = {TALANTA},
	journal = {TALANTA},
	volume = {109},
	unique-id = {2241729},
	issn = {0039-9140},
	abstract = {In this comparative study, the fabrication and the sensing properties of various reflectometric optical ammonia gas sensors are described. In the first set of experiments the role of the support material was investigated on four different sensor membranes. Two of them were prepared by the adsorption of bromocresol green indicator on anodized aluminum plates. The applied anodizing voltages were 12 V and 24 V, which resulted in different dynamic ranges and response times for gaseous ammonia. The sol–gel method was used for the preparation of the other batch of sensors. These layers were coated on anodized aluminum plates (24 V) and on standard microscope cover glasses. In spite of the identical sensing chemistry, slightly different response times were measured merely because of the aluminum surface porosity. Gas molecules can remain entrapped in the pores, which results in delayed recovery time. On the other hand, the porous oxide film provides excellent adhesion, making the anodized aluminum an attractive support for the sol–gel layer.},
	keywords = {sol-gel; Ormosil; Anodized alumina; Optical ammonia sensor},
	year = {2013},
	eissn = {1873-3573},
	pages = {101-106}
}

@article{MTMT:2781054,
	title = {LPG Based fiber optic sensor for carbon dioxide},
	url = {https://m2.mtmt.hu/api/publication/2781054},
	isbn = {9780819491039},
	author = {Gouveia, C and Balogh, Katalin and Baptista, JM and Kovács, Barna and Jorge, PAS},
	doi = {10.1117/12.975279},
	journal-iso = {PROCEEDINGS OF SPIE},
	journal = {PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING},
	volume = {8421},
	unique-id = {2781054},
	issn = {0277-786X},
	year = {2012},
	eissn = {1996-756X},
	pages = {84216L}
}