Determination of Metals in Natural Waters by Inductively Coupled Plasma Optical Emission Spectroscopy after Preconcentration on Silica Sequentially Coated with Layers of Polyhexamethylene Guanidinium and Sulphonated Nitrosonaphthols

Abstract

A series of complexing adsorbents is prepared by coating silica particles with linear polyhexamethylene guanidinium (PHMG) chloride followed by saturation with a number of sulphonated nitrosonaphthols reagents electrostatically retained by positively charged polymer layer. PHMG coated silica is hydrolytically stable even during treatment with 6 M HCl heated up to 50 °C. The adsorption of 1-nitroso-2-naphthol-3,6-disulfonic acid (nitroso-R-salt), 2-nitroso-1-naphthol-4-sulfonic acid (nitroso-N-salt), and 2-nitroso-1-naphthol-3,6-disulfonic acid (nitroso-K-salt) on PHMG modified silica was studied. The effective immobilisation of sulphonated nitrosonaphthols was achieved in the range of pH of 3 - 8, while the adsorption of the monosulphonated reagent (nitroso-N-salt) is twice as high as the disulphonated analogues (nitroso-R-salt and nitroso-K-salt). The adsorption of Cu(II), Fe(III), Co(II), Ni(II), Al(III), Zn(II), Pb(II), Mn(II), and Cr(III) on prepared complexing adsorbents under static and dynamic conditions was studied as a function of time, pH, sample volume, and presence of interfering ions. Metal ions can be desorbed by using 1 M HCl or 1 M HNO3. The preconcentration factors of metals under optimized conditions are varied from 20 to 80. The developed method was used for the preconcentration of trace metals from natural waters followed by ICP-OES determination. The sub-ppb limits of detection of metals are achieved.

A Portable Measurement Device Based on Phenanthroline Complex for Iron Determination in Water

“…The methodologies to quantify iron in water bodies involve complex logistics, requiring coordination between the laboratory and field operators, presence and use of reagents for sample preservation, and previous preparation of materials to accommodate samples during transport to the laboratory [ 23 , 24 , 25 ]. In some cases, it takes days between sample collection and sample analysis.…”

Increase the Efficiency of Dispersive Liquid-Liquid Microextraction (DLLME) and its Use for the Determination of Lead (II) in Aqueous Solutions

“…Therefore, is very important to determine of trace amount of lead in the context of environmental monitoring. In the literature, there are many techniques for the determination of Pb such as atomic absorption spectrometry (AAS) [3], graphite furnace atomic absorption spectrometry (GFAAS) [4], inductively coupled plasma optical emission spectrometry (ICP-OES) [5], and inductively coupled plasma mass spectrometry (ICP-MS) [6]. However, a large number of spectrometric methods are reported.…”

Luminescent Zinc(II) Coordination Polymers of Bis(pyridin-4-yl)benzothiadiazole and Aromatic Polycarboxylates for Highly Selective Detection of Fe(III) and High-Valent Oxyanions

“…Unfortunately, these hazardous pollutants are known to cause seriously harmful effects on the environment and ecosystem and ultimately influence the health of humanity due to their carcinogenic and mutagenic effects to most organisms. − Therefore, it is of great significance to sensitively and selectively detect and monitor hazardous pollutants for the improvement of human health and the protection and maintenance of environmental sustainability. Some traditional techniques such as inductively coupled plasma optical atomic emission spectrometry (ICP-OES), atomic absorption spectrophotometry (AAS), and electrochemical methods have been utilized for the determination of trace chemcial pollutants. However, fluorescence sensing has been proved to be more effective beacsue of its easy use, rapid response, and low cost …”