scholarly journals Optimization of analytical procedures for the simultaneous voltammetric determination of total Hg(II) in presence of Cu(II) in environmental matrices

2012 ◽  
Vol 10 (1) ◽  
pp. 267-276 ◽  
Author(s):  
Dora Melucci ◽  
Simona Montalbani ◽  
Clinio Locatelli
Keyword(s):  
Reference Materials ◽  
Gold Electrode ◽  
Analytical Procedure ◽  
Sea Water ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Standard Reference Materials ◽  
Environmental Matrices ◽  
Simultaneous Voltammetric Determination

AbstractThe present work reports the critical comparison about the employment of three different supporting electrolytes (0.1 mol L−1 HClO4, 0.01 mol L−1 EDTA-Na2 + 0.06 mol L−1 NaCl + 2.0 mol L−1 HClO4 and 0.1 mol L−1 KSCN + 0.001 mol L−1 HClO4) and their instrumental and chemical optimisation for the simultaneous voltammetric determination of total mercury(II) and copper(II) in sediments and sea water at gold electrode, especially discussing the reciprocal interference problems.The differential pulse anodic stripping voltammetric (DPASV) measurements were carried out using a conventional three-electrode cell: a gold electrode (GE) as working electrode, a platinum wire and an Ag‖AgCl‖KClsat as auxiliary and reference electrodes, respectively.The analytical procedure was verified by the analysis of standard reference materials: Estuarine Sediment BCR-CRM 277, River Sediment BCR-CRM 320 and Mercury in Water NIST-SRM 1641d.Once set up on the standard reference materials, the analytical procedure was transferred and applied to sediments and sea waters sampled in a lagoon ecosystem connected with Adriatic Sea (Ravenna area, Italy).

Voltammetric Determination of Metals in Copper Alloys at Trace and Ultratrace Concentrations

2003 ◽  
Vol 68 (8) ◽  
pp. 1437-1448 ◽  
Author(s):  
Clinio Locatelli ◽  
Giancarlo Torsi
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Relative Error ◽  
Analytical Procedure ◽  
Copper Alloys ◽  
Voltammetric Determination ◽  
Standard Reference Materials ◽  
Relative Standard ◽  
Precision And Accuracy

The present work describes the analytical procedures for the voltammetric determination of Cu, Pb, Cd, Zn, Fe, Mn, Co, Ni, Sn, Sb and Bi in copper alloys. The possibility of determining simultaneously metal concentrations in the case of interference of the voltammetric signals due to the peak overlapping is also highlighted and discussed. The analytical procedure was verified by the analysis of the standard reference materials: commercial bronze A NIST-SRM 1115, gunmetal BCS-CRM 207/2, high tensile brass BCS-CRM 390. Precision and accuracy, expressed as relative standard deviation and relative error, respectively, were in all cases lower than 6%. The limits of detection for each element were also reported.

scholarly journals Measurement of Voltammetric Peak Area and Resolution of Overlapping Peaks in the Simultaneous Determination of Copper, Lead, Cadmium, and Nickel in Environmental Matrix

2000 ◽  
Vol 83 (6) ◽  
pp. 1321-1326 ◽  
Author(s):  
Clinio Locatelli
Keyword(s):  
Simultaneous Determination ◽  
Analytical Procedure ◽  
Supporting Electrolyte ◽  
Differential Pulse ◽  
Standard Reference Materials ◽  
Experimental Conditions ◽  
Relative Standard ◽  
Resolution Of Overlapping Peaks ◽  
Determination Of Copper

Abstract Peak area was used for the simultaneous determination of copper(II), lead(II), cadmium(II), and nickel(II) in environmental matrixes by differential pulse voltammetry. The voltammetric measurements were performed with a conventional 3-electrode cell and an ammonia–ammonium chloride buffer, pH 9.1, as the supporting electrolyte. The analytical procedure was verified first in aqueous reference solutions and later by analysis of the standard reference materials Estuarine Sediment BCR-CRM 277 and River Sediment BCR-CRM 320. The precision and accuracy of the method, expressed as the relative standard deviation and the relative error, respectively, were <5% in all cases; the detection limit for each element under the experimental conditions used was in the range 1–5 μg/L. In the case of mutual interference between neighboring elements, an analytical procedure is proposed that is based on the standard additions technique, which allows the resolution of the overlapping voltammetric peaks.

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