Potentiometric detection of carboxylic acids by flow injection analysis using a tungsten oxide electrode

Chen, Zuliang; Alexander, Peter W.

doi:10.1016/0003-2670(96)00258-9

Cited by 16 publications

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“…Pembuatan elektroda tungsten oksida dalam penelitian ini merujuk pada pembuatan elektroda tungsten oksida oleh Chen and Alexander (1996) Optimasi jenis bufer dilakukan dengan cara larutan bufer jenis tertentu (tris-HCl, fosfat dan asetat) sebanyak 10 mL dengan konsentrasi 5 x 10 -4 pada pH 7 diukur potensialnya, kemudian disuntikkan sebanyak 20 µL asam amino 1 x 10 -3 M dan potensialnya diukur kembali. Sedangkang optimasi pH buffer dilakukan dengan cara 10 mL buffer pH dengan konsentrasi 5 x 10 -4 M divariasikan pHnya pada 5,5; 6,0; 6,5; 7,0 dan 7,5.…”

Section: Metode Penelitianunclassified

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Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

2018

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ABSTRAKPenggunaan tungsten oksida sebagai elektroda untuk mendeteksi keberadaan asam aspartat, glutamat dan arginin dalam larutan secara potensiometri dilakukan dalam sistem batch. Karakterisasi elektroda tungsten oksida yang digunakan meliputi rentang linier, limit deteksi, sensitivitas dan reprodusibilitas. Pengaruh jenis buffer dan konsentrasinya dalam analisis juga dipelajari untuk mengoptimasi hasil pengukuran. Dari hasil penelitian, diperoleh kondisi optimum untuk mendeteksi arginin adalah pada buffer fosfat pH 6,0 dengan konsentrasi 0,5 x 10 -3 M. Koefisien korelasi diperoleh sebesar 0,9864, limit deteksi 5,24 x 10 -6 M, sensitivitas 16,1 mV/dekade dengan reprodusibilitas 0 -7 %. Asam glutamat memiliki koefisien korelasi 0,9789, limit deteksi 3,80 x 10 -6 M, sensitivitas 9,2 mV/dekade dan reprodusibilitas 0 -6 %. Asam aspartat memiliki koefisien korelasi 0,9949, limit deteksi 7,76 x 10 -6 M, sensitivitas 13,4 mV/dekade dan reprodusibilitas 0 -5 %.Kata kunci: asam amino, batch, potensiometri, tungsten oksida ABSTRACTThe presence of aspartic acid, glutamic acid and arginine in solution can be detected by potentiometric method using tungsten oxide electrode in a batch system. Characterization of tungsten oxide electrode used include linear range, limit of detection, sensitivity and reproducibility. Buffer type and concentration effect also studied to optimize the measurement results. Optimum conditions for detecting arginine was at pH 6.0 with a phosphate buffer concentration of 0.5 x 10 -3 M. Correlation coefficient was obtained for 0.9864, the detection limit of 5.24 x 10 -6 M, sensitivity 16.1 mV/decade with reproducibility 0 -7 %. Glutamic acid has a correlation coefficient of 0.9789, the detection limit of 3.80 x 10 -6 M, the sensitivity of 9.2 mV/decade and reproducibility of 0 -6 %. Aspartic acid has a correlation coefficient of 0.9949, the detection limit of 7.76 x 10 -6 M, sensitivity of 13.4 mV/decade and reproducibility of 0 -5 %.

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“…Perbedaan potensial (∆E) yang diperoleh ketika asam amino diinjeksikan didasarkan pada reaksi sebagai berikut (Chen et al, 1996) : …”

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Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

2018

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“…Similarly, it would improve the electrode response by coating Nafion film on the surface of electrode for the potentiometric sensor. Our previous study has shown that the tungsten oxide electrode can be utilized for the potentiometric detection of carboxylic acids in FIA based on direct detection of H ‫ם‬ ions [19]. This study aimed to develop a potentiometric sensor based on tungsten oxide coated with Nafion to improve the electrode response and electrode lifetime for flow systems.…”

Section: Introductionmentioning

confidence: 99%

Potentiometric flow-injection analysis of alkali and alkaline metals with a tungsten oxide coated nafion film sensor

Chen

Alexander

1997

Laboratory Robotics and Automation

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“…Em geral a sensibilidade destes eletrodos depende da espessura e da natureza do filme de óxido formado. Diversos autores mostraram a viabilidade do emprego destes eletrodos[51][52][53][54]. Gomes e outros autores[52] estudaram eletrodos formados por Nb 2 05!…”

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Esudo do aço inoxidável especial UNS S31254 visando seu emprego em técnicas eletroanalíticas

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À Profa. Silvia Agostinho, pela paixão na execução de suas atividades de docência e pesquisa, e por nunca deixar de acreditar neste trabalho. Às minhas queridas amigasMónica e Ruth, que sempre me incentivaram e ajudaram, com as quais compartilhei algumas tristezas, e agora compartilho esta alegria. Aos amigos que já passaram pelo Laboratório de Eletroquímica II, mas que deixaram saudades e boas recordações, e, mesmo à distância, sempre torceram por mim: Zé Maria, Hernani, Lorenzo, Paulo, Maico, Maurício, Célia, Karen e Isis. Aos amigos atuais do Laboratório de Eletroquímica II, cuja convivência tem sido muito valiosa: Gisele, Juliana, Douglas, Jocicler, Carlos, André e Inada. Ao Nivaldo e ao Paulinho, por quebrarem simplesmente TODOS os galhos que surgiram (e não foram poucos...) durante este trabalho. À Nivalda, por nos ajudar em tudo o que precisamos. Ao prof. Pedro Nascente, do DEMa/UFSCar, pela realização das medidas por XPS, e pelo auxílio na interpretação dos resultados. Aos meus pais e aos meus irmãos. Ao Gunga, ao Murilo e ao Matheus, que me ajudaram de todas as formas durante todo este trabalho e principalmente durante sua conclusão. Índice Resumo Abstract iii Introdução 1 Capítulo 1. Revisão Bibliográfica 6.4. Viabilidade do emprego de diferentes aços inoxidáveis como eletrodo 118 indicador para medidas de pH Considerações finais e sugestões para trabalhos futuros 119 Referências Bibliográficas 121

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Potentiometric detection of carboxylic acids by flow injection analysis using a tungsten oxide electrode

Cited by 16 publications

References 16 publications

Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

Batch Injection Potentiometry Asam Aspartat, Asam Glutamat Dan Arginin Menggunakan Elektroda Tungsten Oksida

Potentiometric flow-injection analysis of alkali and alkaline metals with a tungsten oxide coated nafion film sensor

Esudo do aço inoxidável especial UNS S31254 visando seu emprego em técnicas eletroanalíticas

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