Paired emitter detector diode (PEDD)-based photometry – an alternative approach

Tymecki, Łukasz; Pokrzywnicka, Marta; Koncki, Robert

doi:10.1039/b807127f

Cited by 65 publications

(52 citation statements)

References 12 publications

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“…As was reported by Tymecki and co-workers 20,21 in a recent study, the signal generated by the LED wired as a photodetector increases with the electric current intensity. Therefore, the generated difference of potential (S 0 ) was the parameter used to monitor light absorption as a function of the electric current intensity, yielding the results shown in Table 3.…”

Section: Resultssupporting

confidence: 74%

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Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

Silva¹,

Crispino²,

Reis³

2010

J. Braz. Chem. Soc.

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Neste trabalho, é descrito um fotômetro de baixo custo baseado em um par de LEDs idênticos, empregando um, como fonte de luz e o outro como fotodetector. O equipamento, incluindo o fotômetro e o módulo de análises, foi projetado para implementar um procedimento de titulação automático empregando o processo de multicomutação por injeção em fluxo (MCFIA). O sistema proposto dispunha de meios para realizar a titulação fotométrica sem a necessidade de empregar curva analítica. A utilidade foi comprovada analisando amostras de vinagre e sucos de limão, laranja, abacaxi, maracujá e cajú. A exatidão foi verificada comparando os resultados com outros, obtidos empregando procedimento manual, e não foi observada diferença significativa no nível de confiança de 95%. Amostras com diferentes concentrações de ácido, tais como suco de limão (1.084,73 mmol L ) foram tituladas usando a mesma solução titulante, e sem modificação do sistema de titulação.In this work, a reliable and inexpensive photometer based on twin LEDs assembled as a radiation source and as a photodetector is described. The setup including the photometer and flow system module was designed to implement an automated titration procedure employing the multicommuted flow injection analysis (MCFIA) process. The proposed system was able to carry out photometric titration without using analytical curve to achieve the sample concentration. Its usefulness was proven by analyzing vinegar and lemon, orange, pineapple, maracock, and acajou juices. Accuracy was accessed comparing results with those obtained employing a manual procedure and no significant difference was observed at 95% confidence level. Samples presenting different acid concentrations such as lemon juice (1084.73 mmol L -1 ) and pineapple juice (14.42 mmol L -1 ) could be titrated using the same titration solution without any modification of the titrating setup.

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Section: Resultssupporting

confidence: 74%

“…Recently, Tymecki and co-workers 20,21 showed that a LED acting as a photodetector generated a difference of electric potential proportional to the intensity of the light illuminating it. Aiming to prove that a LED could be a reliable photodetector, assays were carried out using solutions of Fe III and Co II complexes with SCN -.…”

mentioning

confidence: 99%

Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

Silva¹,

Crispino²,

Reis³

2010

J. Braz. Chem. Soc.

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“…17,18 Each combination of 395, 400, 405, 430, 470 and 475 nm LEDs (5 mm diameter, transparent lens, flat front, 40 view angle) from the same manufacturer (Optosupply, Hong Kong) was tested.…”

Section: Methodsmentioning

confidence: 99%

“…14 The system is based on low-cost microsolenoid devices [14][15][16] and extremely low-cost flow-through optoelectronic detector fabricated according to the paired light emitting diodes concept. 17,18 In the developed flow system, the above mentioned problem of precipitate deposition has been eliminated.…”

Section: Introductionmentioning

confidence: 99%

A Novel Optoelectronic Detector and Improved Flow Analysis Procedure for Ammonia Determination with Nessler’s Reagent

Kołacińska

Koncki

2014

ANAL. SCI.

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This paper presents a simple, rapid and effective method for ammonia determination in a flow analysis regime using Nessler's reagent. The proposed modification of the common flow procedure results in the total elimination of the problem of precipitate deposition inside the flow manifold. The improved procedure has been adapted to a flow analysis system based on microsolenoid pumps combined with a dedicated optoelectronic detector fabricated specifically for this purpose. This photometric device has been constructed in the form of a compact flow-through cell (70 μL total volume and 1 cm optical pathlength) integrated with 395 nm LED emitter and 405 nm LED-based detector. The presented analytical system is capable of ammonia determination in the submillimolar concentration range with a detection limit below 0.1 mM and high throughput (over 20 injections per hour).

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“…However, using the compact disc makes the device bigger than necessary. The other research is a paired emitter detector diode (PEDD) based photometry (3) that uses one color of LED per one detector. The detector have many kinds.…”

Section: Introductionmentioning

confidence: 99%

The Development of a Low Cost and Portable Light Absorbance Measurment Device for Chemical Education

Kittipanyangam

Abe

Eguchi

2016

The Proceedings of the 4th International Conference on Industrial Application Engineering 2016

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This research aims to study about developing and demonstrating the low-cost and portable light absorbance measurement device for using and learning in analytical experiments. In chemistry experiments, the concentration of solutions is important for mixing the sample or making medicines. In present, a UV-spectrophotometer is commonly used to check the absorbance of solution for investigating concentration of solution by the Beer's law before bringing it to use in experiment. Although the UV-spectrophotometer has high quality, student's learning doesn't use all functions of the UV-spectrophotometer. Furthermore, the UVspectrophotometer is very expensive to buy many devices for student's learning. To support student's learning for the chemistry education, we develop a low-cost spectrophotometer by decreasing unnecessary functions and parts. The results show the coefficient of determination of light absorbance compared with the UV-spectrophotometer and the linear regression for calculating unknown concentration of solution. The effectiveness of the proposed device is demonstrated by experiments. Moreover, the program receiving the data from the proposed device can receive many data from many device by wireless network.

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Paired emitter detector diode (PEDD)-based photometry – an alternative approach

Abstract: According to the developed model based on Shockley equation and the Lambert-Beer law, PEDD-based photometric devices generate a potentiometric analytical signal that is directly proportional to the analyte concentration.

Cited by 65 publications

References 12 publications

Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

Automatic photometric titration procedure based on multicommutation and flow-batch approaches employing a photometer based on twin LEDs

A Novel Optoelectronic Detector and Improved Flow Analysis Procedure for Ammonia Determination with Nessler’s Reagent

The Development of a Low Cost and Portable Light Absorbance Measurment Device for Chemical Education

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