Sequential injection on-line matrix removal and trace metal preconcentration using a PTFE beads packed column as demonstrated for the determination of cadmium by electrothermal atomic absorption spectrometry

Wang, Jianhua; Hansen, Elo Harald

doi:10.1039/b111089f

Cited by 46 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although ICPMS provides a multielement analysis capability with high detection sensitivity, the presence of a high content of sodium ions in the sample might create a serious matrix effect that would deteriorate the analytical results. There are a number of documented methods for removing the sodium matrix from complex mixtures, such as biological and seawater samples; the most common are solvent extraction, knotted reactor (KR), − and flow injection methods using columns packed with PTFE beads or other types of resin. − Solvent extraction is hard to couple on-line with the MD sampling probe and ICPMS, and thus, it is ruled out. The tiny sample amounts and lower recoveries render KR as a less-than-useful technique.…”

mentioning

confidence: 99%

In Vivo Monitoring of Multiple Trace Metals in the Brain Extracellular Fluid of Anesthetized Rats by Microdialysis−Membrane Desalter−ICPMS

et al. 2007

View full text Add to dashboard Cite

We have developed an on-line analytical system involving microdialysis (MD) sampling, a carbohydrate membrane desalter (CMD), and an inductively coupled plasma mass spectrometer (ICPMS) system for the simultaneous determination of multiple trace metals in the extracellular fluid (ECF) in the brains of anesthetized rats. The microdialysate that perfused from the animal at a flow rate of 0.5 microL/min was on-line transferred to the CMD to remove the high-sodium matrix, followed by ICPMS measurement. The role of the CMD in this on-line system was investigated in detail. With prior addition of EDTA to the microdialysate to form anionic complexes of the metal analytes and the use of NH4Cl as a regenerant to exchange Na(+) with NH4(+) ions, both quantitative recovery of the trace metal analytes and quantitative removal of the sodium matrix could be achieved. Two experimental modes of the monitoring system were constructed. For those metals (e.g., Cu, Zn, and Mn) that existed at (sub)nanogram-per-milliliter concentrations in the microdialysate, the temporal resolution was 10 min when using a 10 microL loop for sample collection, followed by CMD and ICPMS; for those elements (e.g., Ca and Mg) that existed at microgram-per-milliliter levels (or greater), near-real-time analysis was possible because the microdialysate could be led, bypassing the sample loop, directly to the CMD for desalting without any time delay. Further improvement of the temporal resolution for the low-concentration elements was not possible without decreasing the detection limits of mass detection. Among the eight trace metals tested using this on-line system, the method detection limits for Cu, Zn, Mn, Co, Ni, and Pb reached subnanogram-per-milliliter levels; for electrolyte species such as Ca and Mg, the detection limits were in the range of 50-100 ng/mL. Analytical accuracy, expressed as spike recovery, was 100% +/- 15% for all of the elements tested. We demonstrate the applicability of the proposed system through the successful measurement of the basal values of Ca, Mg, Cu, Zn, and Mn in the ECF of a living rat brain and through in vivo monitoring of the concentration profiles of Mn and Pt in the ECF after the injection of drugs (MnCl2 and cisplatin) into the rats. This microdialysis system is the first to offer real-time, in vivo monitoring of trace elements such as Ca and Mg.

show abstract

mentioning

confidence: 99%

In Vivo Monitoring of Multiple Trace Metals in the Brain Extracellular Fluid of Anesthetized Rats by Microdialysis−Membrane Desalter−ICPMS

et al. 2007

View full text Add to dashboard Cite

show abstract

“…showed some parameters such as concentration factor, limit of detection and correlation coe cient removal of Ni 2+ ions by for various adsorbents and methods. Results demonstrated the proposed method is more accurate, simpler, and faster because it has a lower value of detection limit and less relative standard deviation[31][32][33][34][35]. ( Anthemidis et al.…”

mentioning

confidence: 99%

A novel removal of Ni2+ ions from water solutions using dispersive solid-phase extraction method with nano Fe3O4/chitosan-acrylamide hydrogel

Arvand,

Moghimi,

Salehi

2024

Environ Monit Assess

View full text Add to dashboard Cite

The e uent release containing heavy metals as Ni 2+ ions has drastic risks to both the natural environment and human health. In this research, the nano Fe 3 O 4 /chitosan-acrylamide hydrogel was prepared as a novel nano sorbent for dispersive solid-phase extraction of Ni 2+ ions and applyed in for the water sample solution. The pH, amount and type of elution solvent, the extraction time and etc were optimized for the improving the e ciency of proposed method.Analytical parameters such as concentration factor, the limit of detection and relative standard deviation (%) were achieved as 33.3, 1.25 µg L − 1 and 1.8%, respectively. The capacity in equilibrium sorption was calculated 22.54 mg g − 1 .Furthermore, to estimate adsorption mode, the model of Freundlich and Langmuir was tted to empirical isotherm data.Besides, to check the basic process of the metal adsorption mechanism pseudo-rst-order and pseudo-second-order and Roginsky-Zeldovich model were investigated and the resuls were tted with the pseudo-second-order model. Finally, the nano Fe 3 O 4 /chitosan-acrylamide hydrogel exhibited high performance to removal the Ni 2+ ions from water sample solution.

show abstract

“…Aqueous samples usually must be preconcentrated and separated due to low concentrations and matrix effects. Preconcentration and isolation techniques, such as ion exchange (Nabi et al, 2011;Mthombo et al, 2011), coprecipitation (Tokalioglu et al, 2007), liquid-liquid extraction (Liu et al, 2002;Malvankar and Shinde, 1991), solid phase extraction (Wang et al, 2012;Tuzen et al, 2005) (especially on-line solid phase extraction [Li et al, 2004;Wang and Hansen, 2002]), can be used to achieve a higher confidence level and provide a suitable extract for the determination of the trace elements. Cloud point extraction (CPE) is an efficient separation technique that achieves much a higher concentration of metal ions than liquid-liquid extraction (Ghaedi et al, 2008).…”

mentioning

confidence: 99%

Determination of Lead, Cadmium, Copper, and Nickel in the Tonghui River of Beijing, China, by Cloud Point Extraction-High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry

2013

View full text Add to dashboard Cite

Heavy metal contamination of water has become an important problem in recent years. Most hazardous heavy metals exist in environmental water in trace or ultra-trace amounts, which requires establishing highly sensitive analytical methods. In this research, quantitative analyses were performed using high-resolution continuum source graphite furnace atomic absorption spectrometry combined with cloud point extraction (CPE) to determine Pb, Cd, Cu, and Ni levels in environmental surface water. By optimizing the CPE conditions, the enrichment factors were 29 for Pb, Cd, and Cu and 25 for Ni. The limits of detection (LOD) were 0.080, 0.010, 0.035, and 0.014 μg L for Pb, Cd, Cu, and Ni, respectively. The sensitivity of the method is comparable with those reported in previous investigations using various methods and improves outcome by 2 to 3 orders of magnitude compared with the LODs of the current national standard methods of China. Our method was used to determine Pb, Cd, Cu, and Ni in 55 water samples collected from the Tonghui River, which is the principal river in the urban area of Beijing, China. The results indicated that the distributions of the four heavy metals in the Tonghui River were related with the environments. The levels of Pb and Ni exhibit increasing trends along the river from upstream to downstream possibly due to the existence of some chemical factories in the downstream area. Lead, Cd, Cu, and Ni averaged 13.9, 0.8, 46.8, and 38.5%, respectively, of the total amount of the determined heavy metals. The levels of the four heavy metals conformed to the Environmental Quality Standards for Surface Water (Grade I) of China. This work provides a reliable quantitative method to determine trace-amount heavy metals in water, which lays a foundation for establishing standards and regulations for environmental water protection.

show abstract

Sequential injection on-line matrix removal and trace metal preconcentration using a PTFE beads packed column as demonstrated for the determination of cadmium by electrothermal atomic absorption spectrometry

Cited by 46 publications

References 26 publications

In Vivo Monitoring of Multiple Trace Metals in the Brain Extracellular Fluid of Anesthetized Rats by Microdialysis−Membrane Desalter−ICPMS

In Vivo Monitoring of Multiple Trace Metals in the Brain Extracellular Fluid of Anesthetized Rats by Microdialysis−Membrane Desalter−ICPMS

A novel removal of Ni2+ ions from water solutions using dispersive solid-phase extraction method with nano Fe3O4/chitosan-acrylamide hydrogel

Determination of Lead, Cadmium, Copper, and Nickel in the Tonghui River of Beijing, China, by Cloud Point Extraction-High Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry

Contact Info

Product

Resources

About