Heavy Metals in Matrices of Food Interest: Sequential Voltammetric Determination at Trace and Ultratrace Level of Copper, Lead, Cadmium, Zinc, Arsenic, Selenium, Manganese and Iron in Meals

Abstract

The voltammetric methods are very suitable and versatile techniques for the simultaneous metal determination in complex matrices. The present work, regarding the sequential determination of Cu(II), Pb(II), Cd(II), Zn(II) by square-wave anodic stripping voltammetry (SWASV), As(III), Se(IV) by square-wave cathodic stripping voltammetry (SWCSV) and Mn(II), Fe(III) by square-wave voltammetry (SWV) in matrices involved in foods and food chain as wholemeal, wheat and maize meal, are an interesting example of the possibility to sequentially determine each single element in real samples. Besides the set up of the analytical method, particular attention is aimed either at the problem of possible signal interference or to show that, using the peak area A p as instrumental datum, it is possible to achieve lower limits of detection. The analytical procedure was verified by the analysis of the standard reference materials: Wholemeal BCR-CRM 189, Wheat Flour NIST-SRM 1567a and Rice Flour NIST-SRM 1568a. Precision, as repeatability, and accuracy, expressed as relative standard deviation and relative error, respectively, were lower than 6% in all cases. In the presence of reciprocal interference, the standard addition method considerably improved the resolution of the voltammetric technique. Once set up on the standard reference materials, the analytical procedure was transferred and applied to commercial meals sampled on market for sale. A critical comparison with spectroscopic measurements is also discussed.

Correlation of cadmium and aluminum in blood samples of kidney disorder patients with drinking water and tobacco smoking: related health risk

“…The high exposure of Cd produces a wide variety of toxic effects on internal organs of human (Järup and Å kesson 2009;Satarug et al 2011). One of the major problems in ecology is linked to the path of toxic metals that consist in all matrices that involved in foods and food chain (Locatelli 2004;Cui et al 2005). Cd is present in tobacco smoke and contributes significantly to cancer risk (Fowles and Dybing 2003).…”

Screening and confirmatory methods for the detection of heavy metals in foods

“…7 The same treatment procedure was used with the square wave anodic stripping voltammetry (SWASV) technique. 8 This analytical procedure was applied to detect copper, zinc, antimony, lead and cadmium. The detection limits were equal to 0.031 and 0.029 μ g/L for lead and cadmium, respectively, in standard solution.…”

Voltammetric Analysis of Trace Levels of Platinum Group Metals – Principles and Applications

“…1) The standard addition method [71,72], that allows to establish the element concentration ratio within which the metal present at lower concentration can be determined.…”