Square-wave stripping voltammetry for direct determination of eight heavy metals in soil and indoor-airborne particulate matter

Trace metals were a dangerous composition in airborne particulate matter, which may cause hazardous diseases in human. Accurately determination of metal concentration is significant. The analysis needs to have high precision and accuracy. Therefore, the stripping voltammetry is a appropriate method for determination of trace metals, including Zn, Cd, Pb, Cu, Co, Ni. Various experimental parameters were studied and optimized. The detection limits of these metal ions were 3,47, 0,34, 0,59, 0,68, 2,51, 0,06 ppb for Zn(II), Cd(II), Pb(II), Cu(II), Ni(II) and Co(II), respectively, with very good accuracy (standard deviation is below 5%). Interference from coexisting ions was successfully investigated. The sample was digested by microwave oven with the recoveries from 96,7% to 106%. The great advantage of method is the simplicity, selectivity, and high sensitivity. The collection of particulate matter was performed from march to june, 2009, at different locations, which represent for residential, traffic and industrial areas. Metal concentrations spanned the range, the lowest was 0,06 ng/m3 for Co and the highest was 505 ng/m3 for Zn. Generaly, lead concentration was lower than TCVN 5937:2005 and range on 1,53-26,84 ng/ m3.

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The determination of bromide, chloride and lead in airborne particulate matter by stripping voltammetry

Analytica Chimica Acta ◽

10.1016/s0003-2670(01)83014-2 ◽

1976 ◽

Vol 86 ◽

pp. 27-34 ◽

Cited By ~ 16

Author(s):

B.L. Dennis ◽

G.S. Wilson ◽

J.L. Moyers

Keyword(s):

Particulate Matter ◽

Airborne Particulate Matter ◽

Stripping Voltammetry ◽

Airborne Particulate

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Adsorptive stripping voltammetric determination of the anti-inflammatory drug tolmetin in bulk form, pharmaceutical formulation and human serum

Open Chemistry ◽

10.2478/s11532-007-0026-8 ◽

2007 ◽

Vol 5 (3) ◽

Cited By ~ 4

Author(s):

Amr Beltagi ◽

Mona El-Attar ◽

Enass Ghoneim

Keyword(s):

Human Serum ◽

Mercury Electrode ◽

Direct Determination ◽

Stripping Voltammetry ◽

Pharmaceutical Formulation ◽

Analyte Molecule ◽

Square Wave ◽

Limit Of Quantitation ◽

Square Wave Stripping Voltammetry

AbstractThe electro-reduction of tolmetin at the hanging mercury drop electrode was studied in different supporting electrolytes using cyclic voltammetry and square-wave stripping voltammetry techniques. Voltammograms of tolmetin exhibited a single well-defined 2-electron irreversible cathodic peak in media of pH C=O double bond of the analyte molecule. Adsorption of tolmetin onto the surface of the hanging mercury electrode was identified and each adsorbed tolmetin molecule was found to occupy an area of 0.23 nm2. A square-wave adsorptive cathodic stripping voltammetric procedure was described for the direct determination of tolmetin in bulk form and pharmaceutical formulation (Rumatol® capsules) with a limit of quantitation of 2 × 10−9 M and a mean percentage recovery of 98.35 ± 1.21% to 99.57 ± 1.23. Moreover, the described procedure was successfully applied for the direct assay of tolmetin in spiked human serum without pretreatment or extraction prior to the analysis while a quantitation limit of 5 × 10−9 M tolmetin was achieved.

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