Simplified paired-emitter–detector-diodes-based photometry with improved sensitivity

Tymecki, Łukasz; Koncki, Robert

doi:10.1016/j.aca.2009.03.014

Cited by 55 publications

(28 citation statements)

References 17 publications

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“…The obtained peaks were very high (the signals exceeded 1000 millivolts and were limited by almost total discharge of LED-based detector). 18 Unfortunately, the stepwise changes of the baseline after each injection were distinctly observed. They were caused by the deposition of the reaction product on the inner walls of the FIA system (particularly inside of the window of the PEDD detector).…”

Section: Resultsmentioning

confidence: 99%

“…The observed shift of calibration graph with PEDD supplying current stays in agreement with previous findings and is discussed in detail elsewhere. 18 The analysis of the obtained results (Fig. 2C) leads to the conclusion that the most applicable choice is to use 2% Nessler's reagent and 20 mA PEDD current.…”

Section: -16mentioning

confidence: 91%

“…19 The LED emitter was powered with stable currents using a low-voltage circuit based on L272 chip obtained from TME (Poland). The analytical signal (the electromotive force generated by illuminated LED-based detector) 18 was measured and recorded with UNI-T multimeter (Model UT70B, China) operating in the voltmeter mode and connected with a data storage PC using RS232 interface.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

Section: -16mentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Bonds in atomic crystals, energy levels, quantum chemistry and electronegativity visualized by light emitting diodes (LED)

Koch

2019

Chemkon

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Zusammenfassung: Bindungeni ngemischtenAtomkristallenwerdenanhand derElementeN ,PundAsd er Gruppe 15 ausdem PeriodensysteminLeuchtdioden (LED)exemplarisch betrachtet.Die Farbebzw.die Lichtenergie visualisiertdie Elektronegativitätder Elemente.EineK ombination vonv erschiedenfarbigen LEDs alsE mitter undA bsorber(Detektoren)erlaubt,die Lichtenergienzuvergleichen undd as Spektrum nach Energiez uo rdnen. Es zeigts ich, dass Elektronen erst ab einerbestimmtenSchwelleins Leitungsbanda ngeregtw erden: Dasi st der( innere)p hoto-elektrischeE ffekt, einA usdruckd er Quantifizierungd er Energiebei Bindungen.Stichworte: Bindungend er Elemente N, Pu nd As · Visualisierung derI onisierungsenergie undE lektro-negativität·Innererphotoelektrischer Effekt Bondsinatomiccrystals, energy levels,quantum chemistry ande lectronegativityv isualizedb yl ight emitting diodes (LED) Abstract: Chemical bondsa re discussedw itht he example of theg roup 15 elements N, Pa nd As in lighte mitting diodes (LED). Thec olourr esp. thel ight energy visualizes thee lectronegativity.P airing LEDo fd ifferent colour as emitters anda bsorbers (detectors)a llowsacomparison betweent heir different lighte nergy. Electronsr equire energy aboveag iven thresholdt ob ee xcited to the conducting band:T hati st he (inner)p hotoelectric effect, an indication of thequantification of energy also in relation to chemical bonds.Keywords: chemical bondso ft he elements N, Pa nd As · visualisationo fi onisatione nergya nd electronegativity· innerphotoelectric effect

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Hemoglobin determination with paired emitter detector diode

2010

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Two ordinary green light-emitting diodes used as light emitter and detector coupled with simple voltmeter form a complete, cost-effective prototype of a photometric hemoglobinometer. The device has been optimized for cuvette assays of total hemoglobin (Hb) in diluted blood using three different chemical methods recommended for the needs of clinical analysis (namely Drabkin, lauryl sulfate, and dithionite methods). The utility of developed device for real analytics has been validated by the assays of total Hb content in human blood. The results of analysis are fully compatible with those obtained using clinically recommended method and clinical analyzer.

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Simplified paired-emitter–detector-diodes-based photometry with improved sensitivity

Cited by 55 publications

References 17 publications

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

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

Bonds in atomic crystals, energy levels, quantum chemistry and electronegativity visualized by light emitting diodes (LED)

Hemoglobin determination with paired emitter detector diode

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