Determination of lead and mercury in sea water by preconcentration in a flow injection system followed by atomic absorption spectrometry detection

Sánchez, Luis Ramón Bravo; Riva, Blanca San Vicente de la; Costa‐Fernández, José M.; Pereiro, Rosario; Sanz‐Medel, Alfredo

doi:10.1016/s0039-9140(01)00523-9

Cited by 54 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results, shown in Table 5, indicated excellent recovery. As it can be seen, high value of lead level (57.1 ng ml −1 ) was found in the seawater sample tacked near Málaga Port (Spain), as compared with less contaminated beaches next Avilés industrial harbor (Spain) (1.33 ng ml −1 ) [36]. The levels detected in sea water samples collected from different places near to waste effluents of Salvador City, Bahia, Brazil, are in the range 7-14 ng ml −1 [37].…”

Section: Application To the Analysis Of Samplesmentioning

confidence: 90%

Automatic on line preconcentration and determination of lead in water by ICP-AES using a TS-microcolumn

Zougagh

Torres

Alonso

et al. 2004

Talanta

View full text Add to dashboard Cite

A simple, sensitive, low-cost and rapid, flow injection system for the on-line preconcentration of lead by sorption on a microcolumn packed with silica gel funtionalized with methylthiosalicylate (TS-gel) was developped. The metal is directly retained on the sorbent column and subsequently then eluted from it by EDTA. Five variables (sample flow rate, eluent flow rate, eluent concentration, pH and buffer concentration) were considered as factors in the optimization process. Interactions between analytical factors and their optimal levels were investigated using two level factorial and Box-Behnken designs. The optimum conditions established were applied to the determination of lead by flow injection inductively coupled plasma atomic emission spectrometry (FI-ICP-AES). The proposed method has a linear calibration range from 10 to at least 500 ng ml −1 of lead. At a sample frequency of 24 h −1 and a 120 s preconcentration time, the enrichment factor was 41, the detection limit was 15.3 ng ml −1 (S/N = 3) and the precision, expressed as relative standard deviation, was 0.9% (at 100 ng ml −1 ). Validation of the developed method was carried out against electrothermal atomic absorption spectrometry analysis without statistically significant differences between the proposed method and the atomic absorption method.

show abstract

Section: Application To the Analysis Of Samplesmentioning

confidence: 90%

Automatic on line preconcentration and determination of lead in water by ICP-AES using a TS-microcolumn

Zougagh

Torres

Alonso

et al. 2004

Talanta

View full text Add to dashboard Cite

show abstract

“…In order to avoid the poison of heavy metal to ecosystem, cost-effective and accurate detection of these metal ions is necessary. To date, numerous approaches, such as colorimetric [2], fluorescent [3], atomic absorption/emission spectroscopy [4], inductively coupled plasma mass spectroscopy (ICP-MS) [5] and electrochemical assays [6], have been developed. Most of them require sophisticated equipments or sample treatments [7].…”

Section: Introductionmentioning

confidence: 99%

Label-Free Detection of Cu2+ and Hg2+ Ions Using Reconstructed Cu2+-Specific DNAzyme and G-quadruplex DNAzyme

Huang

Cai

et al. 2013

PLoS ONE

View full text Add to dashboard Cite

Label-free metal ion detection methods were developed. To achieve these, a reconstructed Cu2+-specific DNA-cleaving DNAzyme (Cu2+-specific DNAzyme) with an intramolecular stem-loop structure was used. G-quadruplex-forming G-rich sequence(s), linked at the ends of double-helix stem of an intramolecular stem-loop structure, was partly caged in an intramolecular duplex or formed a split G-quadruplex. Cu2+-triggered DNA cleavage at a specific site decreased the stability of the double-helix stem, resulting in the formation or destruction of G-quadruplex DNAzyme that can effectively catalyze the 2,2′-azinobis(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS)-H2O2 reaction. Based on these, two label-free, cost-effective and simple Cu2+ sensors were designed. These two sensors followed different detection modes: ‘turn-on’ and ‘turn-off’. As for the ‘turn-on’ sensor, the intramolecular stem-loop structure ensured a low background signal, and the co-amplification of detection signal by dual DNAzymes (Cu2+-specific DNAzyme and G-quadruplex DNAzyme) provided a high sensitivity. This sensor enabled the selective detection of aqueous Cu2+ with a detection limit of 3.9 nM. Visual detection was possible. Although the ‘turn-off’ sensor gave lower detection sensitivity than the ‘turn-on’ one, the characteristics of cost-effectiveness and ease of operation made it an important implement to reduce the possibility of pseudo-positive or pseudo-negative results. Combining the ability of Hg2+ ion to stabilize T-T base mismatch, above dual DNAzymes-based strategy was further used for Hg2+ sensor design. The proposed sensor allowed the specific detection of Hg2+ ion with a detection of 4.8 nM. Visual detection was also possible.

show abstract

“…Lead ion (Pb 2+ ), one of the most serious metallic toxicants, can damage cardiovascular, reproductive, neurological, and developmental systems of the human body at low concentrations in the blood (Yoosaf et al, 2007;Zhou et al, 2011;Kim et al, 2012;. Although traditional methods including inductively coupled plasma mass spectrometry (Xia et al, 2008;Gao et al, 2009), atomic absorption spectroscopy (Bravo-Sanchez et al, 2001), and high-performance liquid chromatography (Yang et al, 2003) are highly sensitive and accurate, complicated pretreatment, and implementation limit their applicability for on-site rapid detection. Therefore, it is of important significance to develop analytical strategies with facile and straightforward features.…”

Section: Introductionmentioning

confidence: 99%

A Fluorescence Resonance Energy Transfer Probe Based on DNA-Modified Upconversion and Gold Nanoparticles for Detection of Lead Ions

Wang

Chen

et al. 2020

Front. Chem.

View full text Add to dashboard Cite

We report a new sensor for the specific detection of lead ions (Pb 2+) in contaminated water based on fluorescence resonance energy transfer (FRET) between upconversion nanoparticles (UCNPs) as donors and gold nanoparticles (Au NPs) as receptors. The UCNPs modified with Pb 2+ aptamers could bind to Au NPs, which were functionalized with complementary DNA through hybridization. The green fluorescence of UCNPs was quenched to a maximum rate of 80% due to the close proximity between the energy donor and the acceptor. In the presence of Pb 2+ , the FRET process was broken because Pb 2+ induced the formation of G-quadruplexes from aptamers, resulting in unwound DNA duplexes and separated acceptors from donors. The fluorescence of UCNPs was restored, and the relative intensity had a significant linear correlation with Pb 2+ concentration from 0 to 50 nM. The sensor had a detection limit as low as 4.1 nM in a buffer solution. More importantly, the sensor exhibited specific detection of Pb 2+ in complex metal ions, demonstrating high selectivity in practical application. The developed FRET prober may open up a new insight into the specific detection of environmental pollution.

show abstract

Determination of lead and mercury in sea water by preconcentration in a flow injection system followed by atomic absorption spectrometry detection

Cited by 54 publications

References 20 publications

Automatic on line preconcentration and determination of lead in water by ICP-AES using a TS-microcolumn

Automatic on line preconcentration and determination of lead in water by ICP-AES using a TS-microcolumn

Label-Free Detection of Cu2+ and Hg2+ Ions Using Reconstructed Cu2+-Specific DNAzyme and G-quadruplex DNAzyme

A Fluorescence Resonance Energy Transfer Probe Based on DNA-Modified Upconversion and Gold Nanoparticles for Detection of Lead Ions

Contact Info

Product

Resources

About