Fibre-optic pH sensor for sea-water monitoring using a single dye

Serra, Giorgio; Schirone, Antonio; Boniforti, R.

doi:10.1016/s0003-2670(00)81251-9

Cited by 31 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sulfophthalein based sensors have been prepared using styrene-divinylbenzene copolymers (refs ( 19 , 22 , 43 , 45 , 102 , 245 , 253 , 265 , 273 , 288 − 291 , 298 , and 306 )), agarose, 309 cellulose, 38 , 213 , 232 − 234 , 263 , 276 , 302 , 351 nylon-6 fibers, 241 PVA, 310 PVC, 232 − 234 , 296 PVI, 287 − 289 sol–gel (refs ( 194 , 226 , 252 , 254 , 255 , 257 ), ( 259 − 262 , 267 , 269 , 272 , 277 , 279 ), ( 281 − 284 , 286 , 293 , 294 ), ( 301 , 311 , 312 , 314 , 352 )), SiO 2 –TiO 2 composites, 246 , 247 , 266 , 316 and ormosils 254 , 256 , 258 , 264 , 268 , 270 , 271 , ...…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

“…1151 Several groups have attempted to design/adapt pH optodes for oceanographic applications. Almost three decades ago, Serra et al designed a colorimetric fiber-optic sensor for seawater measurements, 306 which however had moderate reproducibility. Clarke et al 120 investigated a commercial pH sensitive sensor spot in a custom-made setup including a LED for the excitation, dichroic beam splitter, and a photomultiplier.…”

Section: Sensing and Imaging Of Ph Values In Oceanography And Marine ...mentioning

confidence: 99%

“…Prepared by Peterson and co-workers back in 1980, the first fiber optic pH sensors used phenol red as indicator embedded into polyacrylamide microspheres. Since then, numerous researchers utilized phenol red in optical pH sensors, which is by far the most commonly used pH probe ( , , , , , , , , , , , , , , , − , , , , ). Such popularity can be explained by the response over the physiological pH range and its commercial availability.…”

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

See 2 more Smart Citations

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

View full text Add to dashboard Cite

This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

show abstract

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

Section: Sensing and Imaging Of Ph Values In Oceanography And Marine ...mentioning

confidence: 99%

Section: Overview Of Commonly Used Absorptiometric Ph Probesmentioning

confidence: 99%

See 1 more Smart Citation

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

View full text Add to dashboard Cite

show abstract

“…In 1990 Serra et al published a fibre-optic pH sensor for seawater monitoring employing phenol red immobilised on amberlite XAD-2 resin. 16 Hulth et al described a planar pH sensor incorporating the fluorescent indicator 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS) with cellulose acetate as matrix for 2-D pH mapping in early diagenetic studies of marine sediments. 17 This system has two drawbacks.…”

Section: Introductionmentioning

confidence: 99%

pH Fluorosensors for use in marine systems

Schröder

Weidgans

Klimant

2005

Analyst

121

View full text Add to dashboard Cite

In this work we present optical pH sensors especially designed for pH measurements in marine environment. Embedded in an uncharged, highly proton-permeable hydrogel matrix, the two novel lipophilic carboxyfluorescein derivatives 2',7'-dihexyl-5(6)-N-octadecyl-carboxamidofluorescein (DHFA) and 2',7'-dihexyl-5(6)-N-octadecyl-carboxamidofluorescein ethyl ester (DHFAE) have apparent dissociation constants of ca. 8.4. The pH transition range of the sensors perfectly matches the pH range occurring in seawater and marine sediment (ca. pH 7.2-9.2). The cross-sensitivity towards ionic strength (IS) was found to be low for DHFA-containing membranes and was even negligible when using DHFAE as indicator. The quantum yield (QY) of DHFA (0.94(basic)) is similar to that of fluorescein (0.97(basic)). QYs of 0.62(basic) and 0.22(acidic) were found for DHFAE. The optical properties of the indicators enable referenced measuring schemes. Lactonisation of the DHFAE chromophore is prevented by esterification of the carboxyl group in 2 position. Thus, internally referenced dual wavelength measurements are possible since the emission maxima of the basic and acidic form of DHFAE differ by 30 nm. Dual lifetime referenced (DLR) measurements were made with pH sensors incorporating ruthenium-(II)-tris-4,7-diphenyl-1,10-phenanthroline (Ru(dpp)(3))-containing reference particles in addition to the indicator. This type of sensor can be applied for pH imaging or in phase-modulation measurements of pH.

show abstract

“…In comparison with air, water is characterized by less assessed scenarios, so several technologies are still under investigation. Sensors based on optical fibers have been tested for pH, nitrates, and ammonia [ 68 , 69 , 70 ], and enzyme-based biosensors have been tested for sulfites and phenols, monitoring both waste and marine or river waters [ 71 , 72 ]. More recently, also in this context and, in particular, to monitor and control water distribution networks, the concept of WSNs has been considered [ 73 ] for marine environments [ 74 , 75 ] and to develop a sort of smart meter for water distribution networks [ 76 ].…”

Section: Environmentmentioning

confidence: 99%

The Development of Sensor Applications in the Sectors of Energy and Environment in Italy, 1976–2015

Francia

2017

Sensors

View full text Add to dashboard Cite

Although sensor technologies have been developing quite similarly all over the world, the investigation of their applications has been more affected by the specific industrial and economic characteristics of each country. This paper aims to investigate the development of applications based on sensor devices in the sectors of energy and the environment, in Italy, throughout the last forty years (1976–2015), examining the most relevant papers published by Italian R & D groups working in this field. Italy depends on foreign imports for more than 80% of its primary energy needs, and this has directed the research effort on the development of sensor applications both to improve load shaping and consumers’ awareness and to develop specific equipment to maximize renewable energy production. Similarly, for the environment sector, there are increasing efforts to develop solutions to support a more and more capillary control of the environment itself using a cooperative approach. In both the sectors it seems that the solutions proposed can help to relieve the structural problems that Italy suffers and that the scientific and technical results obtained so far also have significant international relevance.

show abstract

Fibre-optic pH sensor for sea-water monitoring using a single dye

Cited by 31 publications

References 17 publications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

pH Fluorosensors for use in marine systems

The Development of Sensor Applications in the Sectors of Energy and Environment in Italy, 1976–2015

Contact Info

Product

Resources

About