Determination of toxic heavy metals in sea water by FAAS after preconcentration with a novel chelating resin

Abstract

A solid phase extraction procedure was developed for preconcentration of toxic heavy metals such as cadmium, cobalt, copper, manganese, lead and zinc in sea water samples. A microcolumn packed with 6-[(4-hydroxyphenyl)diazenyl]naphthalene-2,3-diol-formaldehyde (HPDN-F) resin acts as a sorbent to retain the analyte ions by forming metal chelates. The retained trace level metal was subsequently eluted with 1 mol/L HCl and the acid eluent was analysed by Flame Atomic Absorption Spectrophotometer (FAAS). The HPDN-F chelating resin and its metal chelates were characterized by spectral and thermal analysis. The chelating property of the HPDN-F resin towards divalent metal ions was studied as a function of pH and preconcentration flow rate. The recoveries of cadmium, cobalt, copper, manganese, lead and zinc under the optimum working conditions were above 95%. The relative standard deviations were < 2%. The limits of detection were < 0.1 microg/L. The method presented was applied for the determination of cadmium, cobalt, copper, manganese, lead and zinc in sea water samples.

Sensitive determination of trace Cd(ii) and Pb(ii) in soil by an improved stripping voltammetry method using two differentin situplated bismuth-film electrodes based on a novel electrochemical measurement system

“…Over the past several decades, the development of highly effective analytical methods, such as inductively coupled plasma atomic emission spectroscopy (ICP-AES), 7 atomic uo-rescence spectrometry, 8 atomic absorption spectrometry (AAS), 7 colourimetric analysis, 9 inductively coupled plasma mass spectrometry (ICP-MS) 10,11 and ultraviolet-visible (UV-vis) spectrometry, 12,13 for the determination of toxic heavy metals (HMs) at trace levels has attracted increasing interest. Although these methods are sensitive for the determination of HMs at trace levels, long analysis times and tedious sample preparation methods are needed to meet requirements for real sample analysis.…”

Stripping Voltammetric Determination of Lead in Coastal Waters With a Functional Micro-Needle Electrode

“…Therefore, determination of Pb 2+ in coastal waters is of great importance for the environmental protection and public health. Many techniques have been developed for the determination of heavy metal ions, including atomic absorption spectroscopy, atomic emission spectroscopy, and inductively coupled plasma-mass spectrometry (Manivannan and Biju, 2011;Zhu et al, 2017). Although these methods possess various advantages and have been commonly used, the requirement of cumbersome instruments, time-consuming pretreatments, and high cost are the inevitable limitations (Hu et al, 2015;Zhang et al, 2016).…”

Bamboo-derived porous bioadsorbents and their adsorption of Cd(ii) from mixed aqueous solutions

“…With the tremendous increase in the industrial use of heavy metals, seawater pollution has become a severe problem. 1 Metallic substances can be ingested by sh and accumulate in vital organs at high levels, as some studies 2 have shown. The toxicity of Cd(II) is well known; 3 it easily enters the human body through the food chain 4 and can cause severe organ damage.…”