Automated clean up techniques

Mol, Hans

doi:10.1016/b978-044452843-8/50012-2

Cited by 2 publications

(2 citation statements)

References 149 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To improve the limits of detection for trace metals in paper-based devices, a preconcentration procedure was developed. A common technique is the solid-phase extraction where sorbents are used to concentrate an analyte. − However, sorbents can be time consuming to pack into columns and would require a separate consumable and protocols in addition to operating the paper device. Cellulosic paper itself has been used as an alternative sorbent to separate and concentrate analytes, and paper-based microfluidic devices (μPADs) have been reported for low-cost and user-friendly sample preconcentration. − Wong et al demonstrated an evaporative preconcentration process for a tuberculosis biomarker using a heating system on paper .…”

mentioning

confidence: 99%

“…To improve the limits of detection for trace metals in paperbased devices, a preconcentration procedure was developed. A common technique is the solid-phase extraction 27 where sorbents are used to concentrate an analyte. 28−30 However, sorbents can be time consuming to pack into columns and would require a separate consumable and protocols in addition to operating the paper device.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Dual Sample Preconcentration for Simultaneous Quantification of Metal Ions Using Electrochemical and Colorimetric Assays

et al. 2020

View full text Add to dashboard Cite

A paper-based method for heating preconcentration (PAD-HP) has been developed for the determination of Pb 2+ , Cd 2+ , Fe 3+ , and Ni 2+ . The design of our heating system was evaluated for dual quantification of ions using electrochemical and colorimetric methods simultaneously. The PAD-HP was used to detect Pb 2+ and Cd 2+ by anodic stripping voltammetry and to detect Fe 3+ and Ni 2+ by colorimetric reactions. Assay conditions were optimized by evaluating performance when changing the concentration of the colorimetric reagent, eluent volume, electrolyte concentration, and electrochemical parameters. Limits of detection (LOD) were determined to be 0.97 and 2.33 μg L −1 for Pb 2+ and Cd 2+ (via voltammetry) and 0.03 and 0.04 mg L −1 for Fe 3+ and Ni 2+ (via colorimetric assay), respectively. The relative standard deviations for assays were in the range of 5.76 to 10.12%. We observed that the PAD-HP method significantly enhanced the signal of all metals ions (14−100-fold, depending on the metal) in comparison to paper-based devices that did not use a heating preconcentration system. This PAD-HP method was successfully applied to the determination of metals ions in samples of drinking water, tap water, pond water, and wastewater. These results suggest that our approach can provide a convenient strategy to monitor aqueous samples for heavy metals with high sensitivity and selectivity.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Dual Sample Preconcentration for Simultaneous Quantification of Metal Ions Using Electrochemical and Colorimetric Assays

et al. 2020

View full text Add to dashboard Cite

show abstract

Multiresidue Analysis: State of the Art and Prospects

Plaza‐Bolaños

Romero‐González

Frenich

2014

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

Sample treatment is still one of the most critical steps in the analytical process. This chapter aims to show an overview of the main extraction procedures for the multiresidue analysis of organic compounds (e.g. pesticides and veterinary drugs) at trace levels in liquid and solid samples, for instance, food and environmental samples. Considering that traditional extraction techniques such as liquid–liquid extraction and solid‐phase extraction are labor intensive and time consuming, new extraction approaches [i.e. pressurized liquid extraction (PLE), microextraction techniques, QuEChERS ‐based methods (quick, easy, cheap, effective, rugged, and safe)], have been developed in order to minimize organic solvent waste and increase sample throughput and/or automation. Moreover, new developed methods, such as dilute‐and‐shoot are also focused on the extraction of as many residues as possible in order to increase the scope of the analysis. A review of the most relevant extraction techniques has been performed, including traditional, most employed, and recent techniques. Principles and applications of each technique are provided, with figures illustrating the extraction process. In summary, this chapter is a first approach to the analytical methodologies mostly utilized in routine laboratories.

show abstract

Automated clean up techniques

Cited by 2 publications

References 149 publications

Dual Sample Preconcentration for Simultaneous Quantification of Metal Ions Using Electrochemical and Colorimetric Assays

Dual Sample Preconcentration for Simultaneous Quantification of Metal Ions Using Electrochemical and Colorimetric Assays

Multiresidue Analysis: State of the Art and Prospects

Contact Info

Product

Resources

About