scholarly journals Chemical Detection by Analyte-Induced Change in Electrophoretic Deposition of Gold Nanoparticles

2021 ◽  
Author(s):  
Badri Mainali ◽  
Francis Patrick Zamborini
Keyword(s):  
Electrophoretic Deposition ◽  
Indium Tin Oxide ◽  
Negative Charge ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Au Nps ◽  
Hydronium Ions ◽  
Glass Electrodes

Abstract The electrophoretic deposition (EPD) of citrate-stabilized Au nanoparticles (cit-Au NPs) occurs on indium tin oxide (ITO)-coated glass electrodes upon electrochemical oxidation of hydroquinone (HQ) due to the release of hydronium ions. Anodic stripping voltammetry (ASV) for Au oxidation allows the determination of the amount of Au NP deposition under a specific EPD potential and time. The binding of Cr3+ to the cit-Au NPs inhibits the EPD by inducing aggregation and/or reducing the negative charge, which could lower the effective NP concentration of the cit-Au NPs and/or lower the electrophoretic mobility. This lowers the Au oxidation charge in the ASV, which acts as an indirect signal for Cr3+. The binding of melamine to cit-Au NPs similarly leads to aggregation and/or lowers the negative charge, also resulting in reduction of the ASV Au oxidation peak. The decrease in Au oxidation charge measured by ASV increases linearly with increasing Cr3+ and melamine concentration. The limit of detection (LOD) for Cr3+ is 21.1 ppb and 16.0 ppb for 15.1 and 4.1 nm diameter cit-Au NPs, respectively. Improving the sensing conditions allows for as low as 1 ppb detection of Cr3+. The LOD for melamine is 45.7 ppb for 4.1 nm Au NPs.

scholarly journals Microfabricated Au-Film Sensors for the Voltammetric Determination of Hg(II)

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1518
Author(s):  
Maria Tsetsoni ◽  
Eleni Roditi ◽  
Christos Kokkinos ◽  
Anastasios Economou
Keyword(s):  
Electrode Surface ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Voltammetric Determination ◽  
Film Sensor ◽  
Au Film ◽  
Working Electrode ◽  
Anodic Stripping

In this work, a microfabricated Au-film sensor was designed and fabricated for thevoltammmetric determination of Hg(II). The electrode was fabricated on a silicon chip with astandard microengineering approach utilizing photolithography for patterning the electrode shapeand sputtering for deposition of thin Cr and Au films on the surface of the sensors. The sensorswere used for the determination of trace Hg(II) with anodic stripping voltammetry (ASV): initiallyHg(II) in the sample was accumulated on the Au working electrode surface by reduction andformation of an Au(Hg) amalgam followed by oxidation of the preconcentrated metallic Hg using asquare wave voltammetric scan. The limit of detection was 1.5μgL−1 and the coefficient of variationof 10 consecutive measurements was 3.1%.

Fabrication and electrochemical study of [Ru(NH3)6]3+/Nafion modified electrodes for the determination of trace amounts of Pb2+, Cd2+, and Zn2+ via anodic stripping voltammetry

e-Polymers ◽  
2016 ◽  
Vol 16 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Shirley T. Palisoc ◽  
Michelle T. Natividad ◽  
Nicole Mae D.C. Martinez ◽  
Rochelle Marie A. Ramos ◽  
Kevin Anthony Y. Kaw
Keyword(s):  
Indium Tin Oxide ◽  
Pearson Correlation ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Heavy Metal Concentration ◽  
Coating Solution ◽  
Anodic Stripping ◽  
Reduction Current

Abstract[Ru(NH3)6]3+/Nafion modified indium tin oxide (ITO) electrodes were fabricated via the drop coating technique and were used for the simultaneous determination of lead (Pb2+), cadmium (Cd2+), and zinc (Zn2+) in trace amounts using anodic stripping voltammetry (ASV). The amount of [Ru(NH3)6]3+ in the coating solution was varied at 5 mg, 10 mg, and 15 mg. The fabricated electrodes were used to detect varying concentrations of Pb, Cd and Zn. ASV results showed that as the amount of [Ru(NH3)6]3+ was increased, the reduction current of the heavy metals increased as well. The Pearson correlation values obtained for Pb and Cd were close to 1.0, indicating a strong positive linear relationship between the variables. The minimum heavy metal concentration that can be simultaneously detected by the fabricated electrodes is 0.5 ppm.

scholarly journals Determination of Lead (Pb2+) by Anodic Stripping Voltammetry Based on [Ru(NH3)6]3+/Nafion Modified Electrodes

2014 ◽  
Vol 17 (4) ◽  
pp. 205-208 ◽  
Author(s):  
Shirley Tiong Palisoc ◽  
Michelle Tiamzon Natividad ◽  
Patricia Denise DeVera ◽  
Benjamin Simone B. Tuason
Keyword(s):  
Heavy Metal ◽  
Indium Tin Oxide ◽  
Anodic Stripping Voltammetry ◽  
Modified Electrodes ◽  
Stripping Voltammetry ◽  
Redox Mediator ◽  
Anodic Stripping ◽  
Coating Method ◽  
Analyte Solution

Chemically modified [Ru(NH3)6]3+ doped Nafion® thin film was fabricated on indium tin oxide (ITO) coated glass electrodes by using the drop-coating method to detect heavy metal ions of Pb(II) in de-ionized water analyte solution via anodic stripping voltammetry (ASV). This study also determined the effect of varying the concentration of the mediator ([Ru(NH3)6]3+) on the detection of the said heavy metals. The redox mediator Ru(NH3)6]3+ used in the study was effectively incorporated and immobilized within the Nafion modified electrodes. Lead concentration in the electrolyte solution and the concentration of the redox mediator was varied to control the properties of the fabricated electrodes which utilized for heavy metal detection through ASV. The conducting properties of ITO electrodes were enhanced with the deposition of Nafion® attaining minimal interference. The stripping current peaks increased with the concentration of the heavy metal present in the solution as well as with the mediator concentration.

scholarly journals Determination of Lead Desorption from G. fisheri Seaweed Using Edible Eluents by Voltammetry at the Hanging Mercury Drop Electrode

2016 ◽  
Vol 855 ◽  
pp. 3-8 ◽  
Author(s):  
Charuwan Khamkaew ◽  
Sontaya Manaboot
Keyword(s):  
Deposition Time ◽  
Ethylenediaminetetraacetic Acid ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Hanging Mercury Drop Electrode ◽  
Mercury Drop Electrode ◽  
Desorption Efficiency ◽  
Relative Standard

A simple, rapid, selective and sensitivity approach for the determination of Pb(II) in G. fisheri seaweed is described. The method is based on differential pulse anodic stripping voltammetry (DPASV) at hanging mercury drop electrode (HMDE) vs. Ag/AgCl in 0.2 M ammonium acetate (NH4OAc) pH 7.5. The operating analytical conditions; deposition potential (Edep) of -0.4 V, peak potential of -0.78 V, and mercury dropped size of 3 were performed. To see the sensitivity of Pb(II) measurement, the influences of deposition time and stirring speed were investigated. From the findings, the optimal parameters; deposition time of 90 s, and stirring speed of 2000 rpm were obtained. In these conditions, the limit of detection (3σ) of 0.60 µgL-1 and the linear range extended to 12.50 µgL-1 (r2=0.9999) were obtained. The relative standard deviation (RSD) of triplicate measurements using 1.8 µgL-1 of Pb(II) was 1.22%. The method was then applied to measure Pb(II) in real samples. In this study, the desorption efficiency of edible eluents by batch method was determined. The method is based on Pb(II) desorption using different types of edible eluents; acetic acid (HOAc), citric acid (CTA), sodium chloride (NaCl), sodium bicarbonate (NaHCO3), ethylenediaminetetraacetic acid (EDTA), and chitosan (CTS). Batch desorption of Pb(II) from seaweed soaked in individual eluent was performed by shaking at 100 rpm for 2 h at ambient temperature. Results show that the most effective eluent in desorbing the contaminated Pb(II) from G. fisheri with up to 82% of desorption efficiency for bound Pb(II) was EDTA solution.

scholarly journals Electrochemical Determination of Lead Using A Composite Sensor Obtained from Low-Cost Green Materials:Graphite/Cork

2021 ◽  
Vol 11 (5) ◽  
pp. 2355
Author(s):  
Iasmin B. Silva ◽  
Danyelle Medeiros de Araújo ◽  
Marco Vocciante ◽  
Sergio Ferro ◽  
Carlos A. Martínez-Huitle ◽  
...  
Keyword(s):  
Environmental Control ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Operating Conditions ◽  
World Health ◽  
Modified Carbon Paste Electrode ◽  
Relative Standard ◽  
Anodic Stripping

The purpose of this study was to develop an inexpensive, simple, and highly selective cork-modified carbon paste electrode for the determination of Pb(II) by differential pulse anodic stripping voltammetry (DPASV) and square-wave anodic stripping voltammetry (SWASV). Among the cork–graphite electrodes investigated, the one containing 70% w/w carbon showed the highest sensitivity for the determination of Pb(II) in aqueous solutions. Under SWASV conditions, its linear range and relative standard deviation are equal to 1–25 µM and 1.4%, respectively; the limit of detection complies with the value recommended by the World Health Organization. To optimize the operating conditions, the selectivity and accuracy of the analysis were further investigated by SWASV in acidic media. Finally, the electrode was successfully applied for the determination of Pb(II) in natural water samples, proving to be a sensitive electrochemical sensor that meets the stringent environmental control requirements.

scholarly journals TEKNIK VOLTAMETRI PELUCUTAN ANODIK GELOMBANG PERSEGI UNTUK PENENTUAN KADAR LOGAM Cu DALAM KANGKUNG AIR

2016 ◽  
Vol 1 (2) ◽  
pp. 122
Author(s):  
Irdhawati Irdhawati ◽  
Liana Sari ◽  
Ida Ayu Raka Astiti Asih
Keyword(s):  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Water Spinach ◽  
Square Wave ◽  
Anodic Stripping ◽  
Standard Solution ◽  
Linear Concentration Range ◽  
Linear Concentration

ABSTRAK Analisis logam berat Cu(II) dilakukan dengan metode voltametri pelucutan anodik gelombang persegi. Penelitian ini bertujuan untuk mengetahui validitas metode voltametri pelucutan anodik yang digunakan dalam pengukuran kadar logam Cu(II) dalam sampel kangkung air di muara sungai Badung. Elektroda glassy carbon digunakan sebagai elektroda kerja, Ag/AgCl sebagai elektroda pembanding, dan kawat platina sebagai elektroda pembantu. Parameter yang dioptimasi meliputi waktu deposisi dan laju pindai dalam larutan standar Cu(II) 500 ppb. Validasi metode ditentukan dengan menentukan rentang konsentrasi linier, limit deteksi, keberulangan pengukuran, dan persen perolehan kembali. Teknik voltametri pelucutan anodik kemudian digunakan untuk mengukur kadar logam Cu(II) pada sampel kangkung air.Hasil optimasi pengukuran kadar logam Cu(II) yaitu waktu deposisi optimum 60 detik dan laju pindai optimum 10 mV/detik. Pengukuran validitas larutan standar logam Cu(II), rentang konsentrasi linier larutan 50 ~500 ppb dan memiliki nilai koefisien korelasi 0,9983. Limit deteksi 35 ppb, keberulangan pengukuran memiliki rasio Horwitz kurang dari 2, dan persen perolehan kembali 99,35% ± 0,4526. Hasil pengukuran sampel tanaman kangkung memiliki kandungan logam Cu(II) sebesar 4,0 ppm. Berdasarkan Keputusan Direktur Jenderal Pengawasan Obat dan Makanan batas maksimum cemaran logam dalam makanan untuk logam Cu(II) adalah 5,0 ppm. Oleh karena itu dapat diketahui bahwa kandungan logam Cu(II) tidak melebihi kadar maksimum yang diperkenankan. Kata Kunci : logam berat, voltametri pelucutan anodik gelombang persegi, kangkung airABSTRACTHeavy metal analysis of Cu(II) was measured by square wave anodic stripping voltammetry method. The aim of this research is to know the validity of square wave anodic stripping voltammetry method for determination of Cu(II) in water spinach from the estuary of  Badung river. Glassy carbon, Ag/AgCl, and Pt wire electrodes were used as working electrode, reference electrode and counter electrode, respectively. Optimized parameter involved the deposition time and scan rate in standard solution Cu(II) 500 ppb. Furthermore, the validation method was examined by determination of linear concentration range, limit of detection, repetition of measurement, and percent of recovery. Moreover, the result of validation was used for observing of heavy metal Cu(II) content in water spinach.             The result of optimum deposition time is 60 s. Meanwhile, the scan rate optimum is 10 mV/s. Measurement for standard solution 50 ~ 500 ppb on linear concentration range, with correlation coefficient 0,9983. Limit of detection is 35 ppb, repetition of measurement for metal has Horwitz ratio less than 2, and percent recovery of Cu(II) measurement is 99,35% ± 0,4526. The measurement of Cu(II) content in the water spinach sample contain Cu(II) 4,0 ppm. Based on Decree of Directorate General for Drug and Food Control, the treshold line for Cu(II) contamination for food is 5,0 ppm. Therefore, the water spinach sample contain Cu(II) is less than accepted value. Keyword : Heavy metal, square wave anodic stripping voltammetry, water spinach

Spin Coated Hexaammineruthenium(III)/Nafion/ITO electrodes for the Determination of Lead(II) and Cadmium(II) via Anodic Stripping Voltammetry

2017 ◽  
Vol 20 (2) ◽  
pp. 077-082 ◽  
Author(s):  
Shirley T. Palisoc ◽  
Kevin Anthony Y. Kaw ◽  
Michelle T. Natividad ◽  
Julita C. Robles
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Absorption Spectrometry ◽  
Water Color ◽  
Glass Substrates ◽  
Lead And Cadmium ◽  
Anodic Stripping

Hexaammineruthenium (III) [Ru(NH3)6]3+-Nafion®-isopropanol diluted films were spin coated on indium tin oxide (ITO)-coated glass substrates. The fabricated samples were used to determine the presence of lead and cadmium in solution using anodic strip-ping voltammetry (ASV). The calibration sensitivity of the electrodes for lead and cadmium were approximately equal. Detection limits of 5ppb and 4ppb were determined for lead and cadmium respectively. Real sampling tests with commercially available yellow water color yielded 0.7106 ppm of Pb with ASV. The result was verified with atomic absorption spectrometry (AAS) which yielded 0.6923ppm of Pb.

scholarly journals Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
Irdhawati Irdhawati ◽  
Ni Kadak Nevi Titasia ◽  
Emmy Sahara
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Deposition Potential ◽  
Carbon Paste ◽  
Paste Electrode ◽  
Linear Concentration Range ◽  
S Deposition

In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 µg/L and CPE-B was 5-50 µg/L. Limit of detection and quantization using CPE-B were 0.337 µg/L and 0.349 µg/L, lower than CPE i.e., 0.470 µg/L and 0.471 µg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.

scholarly journals The Effect of Salinity on the Release of Copper (Cu), Lead (Pb) And Zinc (Zn) from Tailing

2010 ◽  
Vol 1 (1) ◽  
pp. 16-22
Author(s):  
Apriani Sulu Parubak ◽  
Eko Sugiharto ◽  
Mudjiran Mudjiran
Keyword(s):  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Hanging Mercury Drop Electrode ◽  
Lead And Zinc ◽  
Anodic Stripping ◽  
Determination Of Copper ◽  
Copper Lead

The effects of salinity on the release of copper (Cu), lead (Pb) and zinc (Zn) in tailing sediment have been studied by stripping voltammetry. The purpose of the research is to know the effect of salinity on the release of metals with certain pH, conductivity and variety of metals. Simultaneous determination of copper, lead and zinc in tailing was done by Differential Pulse Anodic Stripping Voltammetry (DPASV) onto hanging mercury drop electrode (HMDE) and nitric acid 65% as support electrolyte. The limit of detection for this method 0.60 µg/L, 0.150 µg/L and 0.238 µg/L for copper, lead and iMc respectively. The stripping solution of 300/00 salinity with pH= 7.85, conductivity= 46.62 mS/cm gives the amounts of released metals as follows :14.867 µg/L Cu, 0.976 µg/L Pb and 6.224 µg/L Zn. These results are higher as compared with the results from 15 0/00 salinity with pH= 7.66, conductivity= 23.22 mS/cm that give released metals of Cu= 7.988 µg/L, Pb= 0.311 µg/L and Zn= 4.699 µg/L. the results from ANOVA suggest that this is due to different in salinity of the solution. It also found that the conductivity does not give any effect. It can be concluded that the higher salinity will that give higher concentration or released metals.

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