Flow-Through Bulk Optode for the Spectrophotometric Determination of Perchlorate

García, Soledad; Albero, Isabel; Ortuño, J; Sánchez‐Pedreño, Concepción; Expósito, Rosario

doi:10.1007/s00604-003-0040-2

Cited by 8 publications

(4 citation statements)

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“…Previously, García et al developed a new type of flow-ion sensitive bulk optode membrane that incorporates a chromogenic reagent (metallochromic indicator) in a plasticized poly (vinyl) chloride membrane entrapped in a cellulose support, which was applied to determining various contaminant metallic ions. The authors also described and tested the performance of a flow-optode membrane, which was constructed using a similar immobilization procedure, for the FI-spectrophotometric determination of perchlorate anion [4]. The optode incorporates the lipophilic pH indicator 5-octadecanoyloxy-2-(4-nitrophenylazo) phenol and methyltridodecylammonium as the active constituents.…”

Section: Absorbancementioning

confidence: 99%

Recent Development in Optical Chemical Sensors Coupling with Flow Injection Analysis

Ojeda

Rojas

2006

Sensors

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Abstract:Optical techniques for chemical analysis are well established and sensors based on these techniques are now attracting considerable attention because of their importance in applications such as environmental monitoring, biomedical sensing, and industrial process control. On the other hand, flow injection analysis (FIA) is advisable for the rapid analysis of microliter volume samples and can be interfaced directly to the chemical process. The FIA has become a widespread automatic analytical method for more reasons; mainly due to the simplicity and low cost of the setups, their versatility, and ease of assembling. In this paper, an overview of flow injection determinations by using optical chemical sensors is provided, and instrumentation, sensor design, and applications are discussed. This work summarizes the most relevant manuscripts from 1980 to date referred to analysis using optical chemical sensors in FIA.

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Section: Absorbancementioning

confidence: 99%

Recent Development in Optical Chemical Sensors Coupling with Flow Injection Analysis

Ojeda

Rojas

2006

Sensors

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“…They are noted for their high solubility, high solvation capacity and high reduction potential in water; properties which make perchlorate ions both chemically stable and a serious risk to human health. 1 During recent decades, different methods for determining perchlorate ions in water samples have been developed, including atomic absorption spectrometry, 2 spectrophotometry, 3,4 ion chromatography 5,6 and mass spectrometry. 7 However, electrochemical detection offers several advantages over these methods, such as ease of use, low cost, direct detection, miniaturisation and fast response times.…”

Section: Introductionmentioning

confidence: 99%

Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

Parra

Crespo

Riu

et al. 2009

Analyst

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A solid contact ion-selective electrode using for the first time multi-walled carbon nanotubes (MWCNT) for the transducer material was developed for detecting perchlorate in water. To demonstrate the excellent ion-to electron transducer ability of the MWCNTs, a 15 microm thick layer of carboxylated MWCNT was deposited between an acrylic membrane selective to perchlorate ions and a glassy carbon rod used as the substrate and electrical conductor. The electrodes showed a Nernstian response of 57 mV decade(-1) (standard deviation of 3 mV decade(-1) over time and different electrodes) across a wide linear range of 10(-6) to 10(-2) M. The limit of detection was 10(-7.4) M of perchlorate. The response time was less than 10 s for activities higher than 10(-6) M and the intermediate-term potential stability shows a small drift of 0.22 mV h(-1) recorded over 5 hours. The electrode displays a selectivity comparable to liquid-contacted ISEs containing the same membrane.

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“…The coating solution and support type were those selected in a previous work [27], because they were found to provide better results for the determination of SCN - .…”

Section: Resultsmentioning

confidence: 99%

“…Diffuse reflectance spectra of the optode membrane were shown in the above work [27]. Curves corresponding to the protonated and deprotonated form of pH indicator were obtained by pumping 10 −2 M HClO 4 or 10 −2 M NaOH solution until a constant diffuse reflectance value was reached.…”

Section: Resultsmentioning

confidence: 99%

Flow-through Bulk Optode for Spectrophotometric Determination of Thiocyanate and Its Application to Water and Saliva Analysis

García

Ortuño

Sánchez‐Pedreño

et al. 2006

Sensors

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A flow-through spectrophotometric bulk optode for the flow-injectiondetermination of thiocyanate is described. As active constituents, the optode incorporatesthe lipophilized pH indicator 5-octadecanoyloxy-2-(4-nitrophenylazo)phenol andmethyltridodecyl ammonium chloride, dissolved in a plasticized poly(vinyl)chloridemembrane entrapped in a cellulose support. The optode is applied, in conjunction with theflow injection technique, to the determination of thiocyanate at pH 7.5 (TRIS/H2SO4). Thesensor is readily regenerated with a 10-2 M NaOH carrier solution. The analyticalcharacteristics of this optode with respect to thiocyanate response time, dynamicmeasurement range, reproducibility and selectivity are discussed. The proposed FI methodis applied to the determination of thiocyanate in waters from different sources and in humansaliva samples in order to distinguish between smokers and non-smokers

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Flow-Through Bulk Optode for the Spectrophotometric Determination of Perchlorate

Cited by 8 publications

References 0 publications

Recent Development in Optical Chemical Sensors Coupling with Flow Injection Analysis

Recent Development in Optical Chemical Sensors Coupling with Flow Injection Analysis

Ion-selective electrodes using multi-walled carbon nanotubes as ion-to-electron transducers for the detection of perchlorate

Flow-through Bulk Optode for Spectrophotometric Determination of Thiocyanate and Its Application to Water and Saliva Analysis

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