scholarly journals STUDI OPTIMASI KROMIUM (VI) DALAM AIR LAUT SECARA VOLTAMMETRI STRIPPING ADSORPTIF

2015 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Deswati ◽  
Hamzar Suryani ◽  
Imelda ◽  
Yulia
Keyword(s):  
Electrolyte Concentration ◽  
Sea Water ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Optimum Conditions ◽  
Accumulation Time ◽  
Accumulation Potential ◽  
Relative Standard

 ABSTRACT Study of optimation chromium (VI) in sea water by adsorptive stripping voltammetry has been done. The aim of this method to get optimum conditions for determination of Cr(VI). Adsorptive stripping voltammetry (AdSV) has been used for the ultra trace determination of chromium using 2,2’- bipyridin as ligand. Parameters were done, like accumulation time, concentration of ligand, pH, accumulation potential, electrolyte concentration and catalyst concentration. In this case, the optimum conditions were reached in accumulation time 80 second, pH 5.0, concentration of 2,2’- bipyridin 10 μM, accumulation potential -0,6 Volt and electrolyte concentration (NH4Cl) 0,1 M. In the optimum conditions, a linear calibration graph was obtained with correlation coefficient of 0.9971, the relative standard deviation was 15.06 % for eight replicates (n = 8) measurements of 10 μg/L of Cr(VI). The detection limit method was 0.1692 μg/L. The method was applied to the direct determination of Cr(VI) in sea water around Muara Padang water. Concentration Cr(VI) in sample was equal to 0.9684 μg/L with recovery of 90.23 %. Keywords : optimation, chromium, adsorptive, stripping, voltammetry

scholarly journals THE OPTIMATION SIMULTANEUOS DETERMINATION OF LEAD(II) AND CADMIUM(II) BY ADSORPTIVE STRIPPING VOLTAMMETRY (ADSV)

2012 ◽  
Vol 5 (2) ◽  
pp. 100
Author(s):  
Deswati ◽  
Hamzar Suyani ◽  
Umiati Loekman ◽  
Nilam Sari
Keyword(s):  
Standard Deviation ◽  
Optimum Condition ◽  
Sea Water ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Optimum Conditions ◽  
Accumulation Time ◽  
Accumulation Potential ◽  
Relative Standard

A selective and sensitive adsorptive stripping voltammetric (AdSV) method for simultaneous determination of lead(II) and cadmium(II) were proposed. The aim of this study was to get the optimum condition for simultaneuos determination of lead(II) and cadmium(II). The parameters were studied such as: variation of accumulation potential, accumulation time, pH, and variation ofcalcon concentration. In this case, the optimum conditions were reached at accumulation potential –0.7 V, accumulation time 80 s, concentration of 0.12 mM calcon, and pH 7.0. At the optimumconditions the relative standard deviation were 2.90% and 1.46% for Pb(II) and Cd(II) respectively for eight replicates (n = 8) measurements. The method was applied for the direct determination of Pb(II) and Cd(II) in sea water around Bungus, Padang City. Concentration Pb(II) and Cd(II) insample were 9.918 μg/L – 27.320 μg/L for Pb(II) and 7.997 μg/L - 32.521 μg/L for Cd(II), with recovery of 99.48%, and 103.28 for Pb(II), and Cd(II) respectively.

scholarly journals SIMULTANEOUS DETERMINATION OF CADMIUM, COPPER AND LEAD IN SEA WATER BY ADSORPTIVE STRIPPING VOLTAMMETRY IN THE PRESENCE OF CALCON AS A COMPLEXING AGENT

2013 ◽  
Vol 13 (3) ◽  
pp. 236-241 ◽  
Author(s):  
Deswati Deswati ◽  
Hamzar Suyani ◽  
Safni Safni ◽  
Umiati Loekman ◽  
Hilfi Pardi
Keyword(s):  
Simultaneous Determination ◽  
Sea Water ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Complexing Agent ◽  
Optimum Conditions ◽  
Accumulation Time ◽  
Accumulation Potential ◽  
Relative Standard

A selective and sensitive adsorptive stripping voltammetric (AdSV) procedure for the simultaneous determination of cadmium, copper and lead in the sea water was conducted. The aim of this research is to get optimum condition for simultaneous determination of cadmium, copper and lead. Adsorptive stripping voltammetry has been used for determination of trace amount of Cd(II), Cu(II) and Pb (II) by using calcon as a complexing agent. The parameters studied were variation of calcon concentration, pH, accumulation potential and accumulation time. In this study, the optimum conditions were calcon concentration of 0.6 mM, pH = 4.0, accumulation potential of -0.7 V and accumulation time of 80 sec. At the optimum conditions, the relative standard deviation were 8.78%, 3.12%, and 4.02% for Cd(II), Cu(II) and Pb(II) respectively for eight replicates (n = 8) measurements of 10 μg/L mixed standard solution of Cd(II), Cu(II) and Pb(II). The method was applied to the direct simultaneous determination of Cd(II), Cu(II) and Pb(II) in sea water around Bungus, Padang City. Concentration of Cd(II), Cu(II) and Pb(II) in samples were equal to 1.8 μg/L for Cd(II), 38.6 μg/L for Cu(II) and 0.7 μg/L for Pb(II) with recovery of 87.03%, 98.80%, and 95.73%, respectively.

scholarly journals STUDI OPTIMASI PENENTUAN KADMIUM(II) SECARA VOLTAMMETRI STRIPPING ADSORPTIF

2015 ◽  
Vol 3 (2) ◽  
pp. 122
Author(s):  
Deswati Deswati ◽  
Hamzar Suyani ◽  
Citra Buhatika
Keyword(s):  
Standard Deviation ◽  
Optimum Condition ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Optimum Conditions ◽  
Accumulation Time ◽  
Relative Standard ◽  
Time Accumulation

  ABSTRACT Study of optimation cadmium(II) by adsorptive stripping voltammetry has been done. The aim of this study to get optimum conditions for determination of Cd(II). Parameters were done : potential accumulation, time accumulation, pH, supporting electrolite concentration and optimum of complex concentration. In this case, the optimum conditions were reached in potential accumulation -0.7 V, time accumulation 60 second, pH 7.0, NH4Cl 0.12 M, calcon concentration 0.12 mM. In the optimum condition was obtained with the relative standard deviation was 4.61% for eight replicates, measurements of 0.01 ppm. The method was applied to the direct determination of Cd(II) in water around Batang Air Dingin Lubuk Minturun and Muara Padang. Concentration Cd(II) in sample was equal to 7.359 μg/L and 3.659 μg/L with recovery of 99.04%. Keywords: cadmiun, adsorptive, stripping, voltammetry

scholarly journals THE METHOD DEVELOPMENT OF ANALYSIS Cd, Cu, Pb AND Zn IN SEA WATER BY ABSORPTIVE STRIPPING VOLTAMMETRY (ASV) IN THE PRESENCE OF CALCON AS COMPLEXING AGENT

2012 ◽  
Vol 12 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Deswati Deswati ◽  
Hamzar Suyani ◽  
Safni Safni
Keyword(s):  
Optimum Condition ◽  
Method Development ◽  
Sea Water ◽  
Supporting Electrolyte ◽  
Direct Determination ◽  
Stripping Voltammetry ◽  
Complexing Agent ◽  
Relative Standard ◽  
Ultra Trace

A sensitive and selective absorptive stripping voltammetric (AdSV) method to determine Cd(II), Cu(II), Pb(II) and Zn(II) in sea water is proposed. The aim of this study was to get optimum condition for the determination of Cd(II), Cu(II), Pb(II) and Zn(II). Absorptive stripping voltammetry has been used for ultra trace determination of Cd(II), Cu(II), Pb(II) and Zn(II) using calcon as a complexing agent (ligand). In this case, the optimum conditions were reached at 0.1 M KCl supporting electrolyte, concentration of 0.5 mM calcon for Cd(II), Cu(II) 0.3 mM while 0.7 mM for Pb(II) and Zn(II), pH 6 for Cu(II) and pH 7 for Cd(II), Pb(II) and Zn(II), accumulation potential -0.5 V for Cu(II) and Pb(II) and -0.6 V for Cd(II) and Zn(II) and accumulation time 70 sec for Cd(II), 90 sec for Cu(II) and Pb (II) while 50 s for Zn(II). At the optimum condition the relative standard deviations were 7.80%, 4.25%, 8.70% and 0.86% for Cd(II), Cu(II), Pb(II) and Zn(II) respectively for eight replicates (n = 8) measurements of 10 μg/L Cd(II), Cu(II), Pb(II) and Zn(II). The method was applied for the direct determination of Cd(II), Cu(II), Pb(II) and Zn(II) in sea water around Bungus, Padang City. Concentration Cd(II), Cu(II), Pb(II) and Zn(II) in sample were 13.200 μg /L for Cd(II), 17.200 μg/L for Cu(II), 0.089 μg/L for Pb(II) and 62.000 μg/L for Zn(II) with recovery of 98.68%, 97.99%, 96.17% and 99.96% for Cd(II), Cu(II), Pb(II) and Zn(II), respectively.

scholarly journals STUDI OPTIMASI PENENTUAN Cu(II) DENGAN MENGGUNAKAN KALKON SEBAGAI PENGOMPLEK SECARA VOLTAMMETRI STRIPPING ADSORPTIF (AdSV)

2015 ◽  
Vol 4 (2) ◽  
pp. 55
Author(s):  
Deswati ◽  
Hamzar Suyani ◽  
Bustanul Arifin ◽  
Imelda ◽  
Yunita Salamah
Keyword(s):  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Complexing Agent ◽  
Trace Concentration ◽  
Accumulation Time ◽  
Sample Concentration ◽  
Accumulation Potential ◽  
Ultra Trace ◽  
Determination Of Copper

 ABSTRACT The research about determination of Cu(II) by adsorptive stripping voltammetry (AdSV) was conducted. AdSV method was applied to the determination of copper in ultra trace concentration. The parameters of ligand, accumulation potential, accumulation time, pH and ligand concentration was studied. Calcon was found as complexing agent that give the highest peak current. The optimum condition are accumulation potential -0,7 V, accumulation time 60 s, pH 10, and calcon concentration 0.12 mM. The relative standar deviation (n=8) at 10 µg/L standard concentration were obtained 4,27 %. This method was applied to determination of Cu(II) in sample from Batang Air Dingin, Lubuk Minturun and Muara Padang. The sample concentration were 4,778 µg/L and 5,189 µg/L for Batang Air Dingin and Muara Padang, respectively. The recovery of this method was studied for sample from Muara Padang and 98,31 % was obtained. Key words :   Adsorptive, Stripping, Voltammetry, Calcon and Copper    

Determination of trace amounts of lead by adsorptive cathodic stripping voltammetry with L-3-(3,4-Dihydroxyphenyl)alanine

2009 ◽  
Vol 74 (4) ◽  
pp. 599-610 ◽  
Author(s):  
Mohammad Bagher Gholivand ◽  
Alireza Pourhossein ◽  
Mohsen Shahlaei
Keyword(s):  
Lead Concentration ◽  
Stripping Voltammetry ◽  
Optimum Conditions ◽  
Lead In Blood ◽  
Accumulation Time ◽  
Cathodic Stripping Voltammetry ◽  
Voltammetric Measurement ◽  
Adsorbed Complex ◽  
Reduction Current

A sensitive and selective procedure is presented for the voltammetric determination of lead. The procedure involves an adsorptive accumulation of lead L-3-(3,4-dihydroxyphenyl)alanine (LDOPA) on a hanging mercury drop electrode, followed by a stripping voltammetric measurement of reduction current of an adsorbed complex at –0.15 V (vs Ag|AgCl). Optimum conditions for lead analysis include pH 8.5, 80 μM LDOPA and accumulation potential –0.15 V (vs Ag|AgCl). The peak currents are proportional to the lead concentration 1–300 nmol l–1 with a detection limit of 0.6 nmol l–1 and accumulation time 60 s. The method was used for the determination of lead in blood, dry tea and also in waters.

scholarly journals First Electrochemical Method of Nitrothal-Isopropyl Determination in Water Samples

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Dariusz Guziejewski ◽  
Agnieszka Nosal-Wiercińska ◽  
Sławomira Skrzypek ◽  
Witold Ciesielski ◽  
Sylwia Smarzewska
Keyword(s):  
Environmental Samples ◽  
Electrochemical Method ◽  
Concentration Level ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Hanging Mercury Drop Electrode ◽  
Optimal Conditions ◽  
Step Potential ◽  
Accumulation Time

The aim of the research was the use of square wave adsorptive stripping voltammetry (SWAdSV) in conjunction with a hanging mercury drop electrode (HMDE) for the determination of nitrothal-isopropyl. It was found that optimal SW technique parameters were frequency, 200 Hz; amplitude, 50 mV; and step potential, 5 mV. Accumulation time and potential were studied to select the optimal conditions in adsorptive stripping voltammetry: 45 s at 0.0 V, respectively. The calibration curve (SWSV) was linear in the nitrothal-isopropyl concentration range from 2.0 × 10−7 to 2.0 × 10−6 mol L−1 with detection limit of 3.46 × 10−8 mol L−1. The repeatability of the method was determined at a nitrothal-isopropyl concentration level equal to 6.0 × 10−7 mol L−1 and expressed as RSD = 5.5% (n=6). The proposed method was successfully validated by studying the recovery of nitrothal-isopropyl in spiked environmental samples.

Sensitive quantification of trace zinc in water samples by adsorptive stripping voltammetry

2013 ◽  
Vol 69 (2) ◽  
pp. 438-442 ◽  
Author(s):  
Shahryar Abbasi ◽  
Abbas Farmany ◽  
Mahmoud Roushani ◽  
Seyede Shima Mortazavi
Keyword(s):  
Water Samples ◽  
Mineral Water ◽  
Stripping Voltammetry ◽  
Adsorptive Stripping Voltammetry ◽  
Complexing Agent ◽  
Peak Current ◽  
Relative Standard ◽  
Preconcentration Time ◽  
Influence Of Ph

A simple and sensitive adsorptive stripping voltammetry method was developed for determination of Zn using N-nitrozo-N-phenylhydroxylamine (cupferron) as a selective complexing agent. This complex absorbed on the hanging mercury drop electrode and created a sensitive peak current. The peak current and concentration of zinc accorded with a linear relationship in the range of 0.85–320 ng mL−1. The influence of pH and the nature of supporting electrolytes, concentration of ligand, preconcentration time and applied potential were investigated. The relative standard deviation at a concentration level of 50 ng mL−1 was 1.8%. The method was applied to the determination of zinc in city, river and mineral water samples, with satisfactory results.

Rapid Direct Determination of Lead in Evaporated Milk by Anodic Stripping Voltammetry Without Sample Pretreatment

1983 ◽  
Vol 66 (6) ◽  
pp. 1409-1413
Author(s):  
Eric W Zink ◽  
Robert A Moffitt ◽  
Wayne R Matson
Keyword(s):  
Anodic Stripping Voltammetry ◽  
Direct Determination ◽  
Sample Pretreatment ◽  
Stripping Voltammetry ◽  
Relative Standard ◽  
Dry Milk ◽  
Anodic Stripping ◽  
Total Analysis ◽  
Sample Range

Abstract The method presented describes the direct determination of lead in evaporated milk in which the milk ashing step prior to analysis is eliminated. Digital instrument readout units are μg Pb /mL milk. Total analysis time after instrument calibration is less than 3 min per sample. Range of the method is 0.05-1.0 ppm lead in milk, and precision of the method expressed by relative standard deviation of duplicate pairs ranged from 30% at 0.1 μg/mL to 3% at 1.0 μg/mL of lead in milk. The method compares favorably with the AOAC official first action anodic stripping voltammetric method (25.074). In addition, the method appears to work equally well for skim evaporated milk, sweetened condensed milk, and nonfat powdered dry milk when the latter two are reconstituted with water according to product label instructions. Recovery and interference studies are presented.

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