Recent Trends in Macro-, Micro-, and Nanomaterial-Based Tools and Strategies for Heavy-Metal Detection Gemma Aragay, Josefina Pons, and Arben Merkoc-i* Nanobioelectronics & Biosensors Group, Institut Catal a de Nanotecnologia (CIN2, ICN-CSIC), 08193, Bellaterra, Barcelona, Spain Departament of Chemistry, Universitat Aut onoma de Barcelona, 08193, Bellaterra, Barcelona, Spain ICREA, Barcelona, Spain

Recent trends in macro-, micro-, and nanomaterial-based tools and strategies for heavy-metal detection.

Honey: Chemical composition, stability and authenticity.

A review on various electrochemical techniques for heavy metal ions detection with different sensing platforms

Atomic Spectra Database

We have shown that superparamagnetic iron oxide (Fe3O4) nanoparticles with a surface functionalization of dimercaptosuccinic acid (DMSA) are an effective sorbent material for toxic soft metals such as Hg, Ag, Pb, Cd, and Tl, which effectively bind to the DMSA ligands and for As, which binds to the iron oxide lattices. The nanoparticles are highly dispersible and stable in solutions, have a large surface area (114 m2/g), and have a high functional group content (1.8 mmol thiols/g). They are attracted to a magnetic field and can be separated from solution within a minute with a 1.2 T magnet. The chemical affinity, capacity, kinetics, and stability of the magnetic nanoparticles were compared to those of conventional resin based sorbents (GT-73), activated carbon, and nanoporous silica (SAMMS) of similar surface chemistries in river water, groundwater, seawater, and human blood and plasma. DMSA-Fe3O4 had a capacity of 227 mg of Hg/g, a 30-fold larger value than GT-73. The nanoparticles removed 99 wt % of 1 mg...

Removal of Heavy Metals from Aqueous Systems with Thiol Functionalized Superparamagnetic Nanoparticles

Honey contains a variety of metals. Major metals are primarily derived from soil and nectar-producing plants, but consideration also needs to be given to environmental pollution or other anthropogenic sources of metals in honey, especially of Cd, Cr, Cu, Fe, Ni, Pb and Zn, which may present hazards to human health and adversely affect the quality and the safety of honey. This review surveys the literature from the past 15 years on determination of the metal content of honey by atomic absorption and emission spectrometries. It pays particular attention to sample treatment, sample preparation and measurement techniques. It also discusses the suitability of information on the composition of metals in honey for classifying according to botanical and geographical origin or indicating and controlling environmental pollution.

Determination of metal content in honey by atomic absorption and emission spectrometries

This article focuses on analysis of metals in wine in the literature devoted to analytical atomic spectrometry in the past decade. It emphasizes the role of metals in wine and processes involved in winemaking. It covers endogenous and exogenous sources of metals in wine, changes in metal composition during vinification, methods of wine analysis, techniques of wine classification corresponding to distinctive metal patterns, and, finally, approaches to operationally-defined fractionation analysis of metals carried out to understand their nutritional value and bioavailability in wine.

What do metals tell us about wine

A non-alcoholic beverage, tea made from leaves of the Camellia sinensis plant is a potentially rich source of dietary important elements and is consumed by nearly half the worlds population. Of the types of tea, black, oolong and green teas are the most popular, so knowledge about their elemental characteristics is especially important. Habitual drinking of tea infusions may significantly contribute to daily dietary requirements of elements or lead to accumulation of elements and intoxication under overdose conditions. It is especially important that toxic and/or heavy metals, which may be retained by tea plants to a great degree, can have adverse effects on human well-being and health. Accordingly, accurate, precise determination of the mineral content of tea leaves from which tea is made, teas available commercially and their infusions allows us to assess exposure to non-essential elements and to judge the nutritional value of tea reliably. Different instrumental techniques are used for elemental analysis, but atomic and mass spectrometries are preferred most. This review surveys the elemental analysis of teas and their infusions, and the consequences of the presence of various elements in this beverage. We also consider sample-preparation procedures before analysis, the results of analysis and the manner of controlling and assuring the quality of those results. a 2012 Elsevier Ltd. All rights reserved.

Elemental analysis of teas and their infusions by spectrometric methods

This article presents recent advances in the hydride-generation (HG) technique hyphenated with different discharges of the atomic emission spectrometry (AES) [i.e. inductively-coupled plasma (ICP), microwave-induced plasma (MIP), direct-current plasma (DCP) and glow discharge (GD)], serving as excitation sources of hydride-forming elements. It surveys and discusses various aspects of vapour-phase introduction, comprising the instrumentation for performing the reaction, the influence of the chemical reaction conditions, the existence of chemical and non-chemical interference effects and the approaches to eliminating or lessening the interferences, as well as the analytical applications to real samples. In addition, it presents the latest trends in the technique, such as expansion of the scope to some transition and noble metals and the usage of organised surfactant-based media for the enhancement of the reaction properties.

Hydride generation – recent advances in atomic emission spectrometry

A novel atmospheric pressure glow discharge generated in contact with a flowing liquid anode (FLA-APGD) was developed as the efficient excitation source for the optical emission spectrometry (OES) detection. Differences in the appearance and the electrical characteristic of the FLA-APGD and a conventional system operated with a flowing liquid cathode (FLC-APGD) were studied in detail and discussed. Under the optimal operating conditions for the FLA-APGD, the emission from the analytes (Ag, Cd, Hg, Pb, Tl, and Zn) was from 20 to 120 times higher as compared to the FLC-APGD. Limits of detections (LODs) established with a novel FLA-APGD system were on average 20 times better than those obtained for the FLC-APGD. A further improvement of the LODs was achieved by reducing the background shift interferences and, as a result, the LODs for Ag, Cd, Hg, Pb, Tl, and Zn were 0.004, 0.040, 0.70, 1.7, 0.035, and 0.45 μg L–1, respectively. The precision of the FLA-APGD-OES method was evaluated to be within 2–5% (as the ...

Flowing Liquid Anode Atmospheric Pressure Glow Discharge as an Excitation Source for Optical Emission Spectrometry with the Improved Detectability of Ag, Cd, Hg, Pb, Tl, and Zn.

Pawel Pohl

Papers

Determination of metal content in honey by atomic absorption and emission spectrometries

What do metals tell us about wine

Elemental analysis of teas and their infusions by spectrometric methods

Hydride generation – recent advances in atomic emission spectrometry

Flowing Liquid Anode Atmospheric Pressure Glow Discharge as an Excitation Source for Optical Emission Spectrometry with the Improved Detectability of Ag, Cd, Hg, Pb, Tl, and Zn.