Combination of knotted reactor with portable tungsten coil electrothermal atomic absorption spectrometer for on-line determination of trace cadmium

Wen, Xiaodong; Yang, Shengchun; Zhang, Haizhu; Deng, Qingwen

doi:10.1016/j.microc.2015.07.019

Cited by 12 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…KRs allow high flow rates with lowpressure drops (the reactor is an open tube); they prevent loss of sensitivity due to dispersion; they are free from contamination since they are made of inert material (PTFE); KR is easy to build and inexpensive with long lifetime without efficiency losing. 16,17 New ideas involving the use of KRs include, as example, three-dimensional printed knotted reactors for sensitive differentiation of silver nanoparticles and ions in aqueous environmental samples, 18 a tandem of KR coupled with a portable tungsten coil electrothermal atomic absorption spectrometer for online determination of trace cadmium, 19 KR modification with activated carbon for determination of arsenic species in medicinal herbs and tea infusions, 20 and an association of cloud-point extraction with KR for cobalt preconcentration following by ET AAS (electrothermal AAS) determination in drinking water. 21 Multicommutation is an automation strategy applied to continuous-flow analysis systems, with configurations modified by computer-controlled commutators.…”

Section: Use Of Arduino In the Development Of A New And Fast Automatementioning

confidence: 99%

Use of Arduino in the Development of a New and Fast Automated Online Preconcentration System Based on Double-Knotted Reactor for the Mn Determination in Tea Samples by Flame Atomic Absorption Spectrometry (F AAS)

Barreto¹,

Lemos²,

Oliveira³

et al. 2020

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

In the present paper, an automated online preconcentration system based on the use of two knotted reactors (KR) was developed for Mn determination in tea samples by flame atomic absorption spectrometry (F AAS). The system automation was performed by using four solenoid valves to switch sample streams and reagents. Valves were driven electronically by an integrated Darlington transistor circuit and controlled by an open-source Arduino hardware platform written in C language. The preconcentration was based on the precipitation process of metal ions complexed with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol (5-Br-PADAP) on the inner walls of the reactor, followed by elution with a solution of hydrochloric acid. The optimized system allowed the Mn determination with limit of detection (LOD) of 2.1 mg L-1 , precision (relative standard deviation (RSD), 50.0 mg L-1) of 2.6% and enrichment factors of 8. The system presented a sampling frequency of 60 h-1. The method accuracy was evaluated by analysis of the certified reference material (CRM) apple leaves (NIST 1515) and by addition/ recovery tests obtaining recoveries between 95.2 to 119%. This method was applied in the Mn determination in commercial tea samples purchased from local trade. Manganese levels were found in a concentration range of 2.95 to 123 μg g-1 .

show abstract

Section: Use Of Arduino In the Development Of A New And Fast Automatementioning

confidence: 99%

Use of Arduino in the Development of a New and Fast Automated Online Preconcentration System Based on Double-Knotted Reactor for the Mn Determination in Tea Samples by Flame Atomic Absorption Spectrometry (F AAS)

Barreto¹,

Lemos²,

Oliveira³

et al. 2020

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Some novel detection methods have been developed for the onsite quantitative analysis of HMs in the last few years. Wen et al established a portable tungsten coil electrothermal atomic absorption spectrometer for HM field analysis [ 14 , 15 , 16 ]. Wang et al designed and implemented a field-based HM detection system involving electrochemical differential pulse anodic stripping voltammetry [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

An Innovative Digestion Method: Ultrasound-Assisted Electrochemical Oxidation for the Onsite Extraction of Heavy Metal Elements in Dairy Farm Slurry

Li¹,

Xue²,

Wang³

et al. 2021

Materials

View full text Add to dashboard Cite

Dairy farm slurry is an important biomass resource that can be used as a fertilizer and in energy utilization and chemical production. This study aimed to establish an innovative ultrasound-assisted electrochemical oxidation (UAEO) digestion method for the rapid and onsite analysis of the heavy metal (HM) contamination level of dairy slurry. The effects of UAEO operating parameters on digestion efficiency were tested based on Cu and Zn concentrations in a dairy slurry sample. The results showed that Cu and Zn digestion efficiency was (96.8 ± 2.6) and (98.5 ± 2.9)%, respectively, with the optimal UAEO operating parameters (digestion time: 45 min; ultrasonic power: 400 W; NaCl concentration: 10 g/L). The digestion recovery rate experiments were then operated with spiked samples to verify the digestion effect on broad-spectrum HMs. When the digestion time reached 45 min, all digestion recovery rates exceeded 90%. Meanwhile, free chlorine concentration, particle size distribution, and micromorphology were investigated to demonstrate the digestion mechanism. It was found that 414 mg/L free chorine had theoretically enough oxidative ability, and the ultrasound intervention could deal with the blocky undissolved particles attributed to its crushing capacity. The results of particle size distribution showed that the total volume and bulky particle proportion had an obvious decline. The micromorphology demonstrated that the ultrasound intervention fragmented the bulky particles, and electrochemical oxidation made irregular blocky structures form arc edge and cellular structures. The aforementioned results indicated that UAEO was a novel and efficient method. It was fast and convenient. Additionally, it ensured digestion efficiency and thus had a good application prospect.

show abstract

“…Therefore, the development of a highly sensitive silver ion recognition receptor and a reliable detection method is of great significance for human health and food safety. At present, the detection of silver ions is usually limited to traditional analytical methods, including atomic absorption spectroscopy (AAS) [13,14], atomic emission spectroscopy (AES) [15,16], inductively coupled plasma mass spectrometry (ICP-MS) and the ion selective electrode method (ISE) [17][18][19][20]. However, these methods not only rely on expensive large-scale precision instruments, cumbersome pretreatment and skilled professional technicians, but they also have time-consuming operation steps, seriously affecting the efficiency of routine and on-site detection.…”

Section: Introductionmentioning

confidence: 99%

Cholesteric Molecular Tweezer Artificial Receptor for Rapid and Highly Selective Detection of Ag+ in Food Samples

Liu

Hong

et al. 2021

Molecules

View full text Add to dashboard Cite

Chiral cholesteric molecular tweezer 7a was synthesized, and its recognition properties for Ag+, Al3+, Ca2+ etc., were investigated by UV and fluorescence spectra. The results showed that in ethanol/Tris (1/1, v/v, pH 7.0) buffer solution, the host molecular tweezer 7a had a specific recognition ability for Ag+, the detection limit was up to 1 × 10−6 mol/L, and other metal ions had little effect on Ag+ recognition. At the same time, the naked-eye detection of Ag+ was realized by the light red color of the complex solution. Furthermore, the mechanism of recognition of Ag+ by molecular tweezer 7a was studied by a nuclear magnetic titration test and computer molecular simulation, and a rapid detection method of Ag+ using host molecular tweezer 7a was established. Through the determination of Ag+ in milk powder, quinoa and other food samples, it was proved that this novel method had a good application prospect for the detection of Ag+ in food.

show abstract

Combination of knotted reactor with portable tungsten coil electrothermal atomic absorption spectrometer for on-line determination of trace cadmium

Cited by 12 publications

References 22 publications

Use of Arduino in the Development of a New and Fast Automated Online Preconcentration System Based on Double-Knotted Reactor for the Mn Determination in Tea Samples by Flame Atomic Absorption Spectrometry (F AAS)

Use of Arduino in the Development of a New and Fast Automated Online Preconcentration System Based on Double-Knotted Reactor for the Mn Determination in Tea Samples by Flame Atomic Absorption Spectrometry (F AAS)

An Innovative Digestion Method: Ultrasound-Assisted Electrochemical Oxidation for the Onsite Extraction of Heavy Metal Elements in Dairy Farm Slurry

Cholesteric Molecular Tweezer Artificial Receptor for Rapid and Highly Selective Detection of Ag+ in Food Samples

Contact Info

Product

Resources

About