Fully inkjet-printed distance-based paper microfluidic devices for colorimetric calcium determination using ion-selective optodes

The Analyst ◽  
2019 ◽  
Vol 144 (4) ◽  
pp. 1178-1186 ◽  
Author(s):  
Hiroyuki Shibata ◽  
Yuki Hiruta ◽  
Daniel Citterio
Keyword(s):  
Calcium Ions ◽  
Water Samples ◽  
Tap Water ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Colorimetric Determination ◽  
Naked Eye ◽  
Paper Microfluidic ◽  
Calcium Determination

Fully inkjet-printed and low-cost microfluidic paper-based analytical devices (μPADs) demonstrate the simple naked-eye colorimetric determination of calcium ions in drinking and tap water samples.

Colorimetric determination of nitrite in clinical, food and environmental samples using microfluidic devices stamped in paper platforms

2015 ◽  
Vol 7 (17) ◽  
pp. 7311-7317 ◽  
Author(s):  
Thiago M. G. Cardoso ◽  
Paulo T. Garcia ◽  
Wendell K. T. Coltro
Keyword(s):  
River Water ◽  
Water Samples ◽  
Environmental Samples ◽  
Statistical Difference ◽  
Reference Method ◽  
Microfluidic Devices ◽  
Colorimetric Determination ◽  
River Water Samples ◽  
Paper Microfluidic

Paper microfluidic devices were explored to perform the colorimetric determination of nitrite in saliva, sausage, ham, preservative water and river water samples with no statistical difference from a reference method.

scholarly journals Determination of essential and non-essential element contents of drinking water and baby water for infant’s nutrition

2021 ◽  
Vol 44 (1) ◽  
pp. 194-202
Author(s):  
Funda Demir ◽  
Meral Yildirim Ozen ◽  
Emek Moroydor Derun
Keyword(s):  
Water Samples ◽  
Infant Nutrition ◽  
Tap Water ◽  
Essential Element ◽  
Essential Elements ◽  
Local Market ◽  
Drinking Waters ◽  
Significant Difference ◽  
Element Contents

Abstract In this study, essential (Ca, Cr, Cu, Fe, K, Mg, Na, P, Zn), and non-essential (Al, Ni, Pb) element contents of the drinking and baby water samples which are sold in the local market and tap water samples in Istanbul were examined. It was determined that elements of Cr, Cu, Fe, P, Zn, Al, and Ni were below detection limits in all water samples. Among the non-essential elements analyzed in water samples, Pb was the only detected element. At the same time, the percentages that meet the daily element requirements of infants were also calculated. As a result of the evaluations made, there is no significant difference in infant nutrition between baby waters and other drinking waters in terms of the element content.

Preparation of Cu2+ Imprinted Polymer Microspheres and its Application for the Determination of Cu2+ in Water

2013 ◽  
Vol 389 ◽  
pp. 7-11 ◽  
Author(s):  
Yong Feng Kang ◽  
Hua Jin Shi ◽  
Lin Ge Yang ◽  
Jun Xia Kang ◽  
Zi Qi Zhao
Keyword(s):  
Water Samples ◽  
Tap Water ◽  
Absorption Spectrometry ◽  
Ion Imprinted Polymer ◽  
Imprinted Polymer ◽  
Surface Molecular Imprinting ◽  
Mixed Aqueous Solution ◽  
Ion Imprinted ◽  
Surface Molecular Imprinting Technique

Copper (II) imprinted polymer particles were prepared by surface molecular imprinting technique in toluenewith 1-hy-droxy-4-(prop-2-enyloxy)-9, 10-anthraquinone (AQ) as the functional monomer, silica gel as the carrier.The effect of adsorption time, acidity, temperature and concentration on adsorption capacity was investigated by atomic absorption spectrometry. Selectivity for Cu2+ of the prepared polymer was also studied in mixed aqueous solution, the ion imprinted polymer were applied to the determination of Cu2+ in river and tap water samples, the concentration of Cu2+ in water samples were determined and the recoveries of Cu2+ in river and tap water samples were 110.7% and 109.2%, respectively.

scholarly journals Lead Ions Removal from Natural Water Samples by Nano-Mint Waste as Benign Low Cost Biosorbent

2018 ◽  
Vol 3 (2) ◽  
pp. 116-126
Author(s):  
Tamer H. A. Hasanin ◽  
Salwa A. Ahmed ◽  
Taghreed B. Ebrahim
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Metal Ion ◽  
Sea Water ◽  
Tap Water ◽  
Low Cost ◽  
Lead Removal ◽  
Lead Uptake ◽  
Natural Water Samples ◽  
Uptake Process

Nano mint waste (NMW) was used as a low-cost nano biosorbent and efficient Pb(II) remover. pH, contact time, biosorbent dose, and concentration of metal ion were optimized using batch technique to optimize maximum capacity of this new biosorbent. NMW was characterized using FT-IR, SEM, TEM, and XRD analyses. The experimental Pb(II) adsorption data by NMW were agreed with both Freundlich and Langmuir models with maximum boisorption capacity of 2.13 mmolg-1 (441.336 mgg-1). In addition, values of lead uptake at different time vaues was best fitted with the kinetic pseudo-second order model. It will be notable that, good data resulted from the kinetic experiments study confirmed a fast accessibility of the Pb(II) to the biosorbent surface, get to equilibrium within 30 seconds. On the other hand, it was observed that, the developed method, was investigated for measuring of Pb(II) with a certain spiked amounts in natural water samples as ground water (GW), sea water (SW), drinking tap water (DTW), natural drinking water (NDW), Nile River water (NRW) and waste water (WW). The good results obtained with high recovered quantitatively using batch experiments, without matrix interferences. Considering its cheap source, environmentally friendly, economic and fast uptake process, NMW can be used as benign nano biosorbent for lead removal from real water samples.

scholarly journals Fluorescence and Naked-Eye Detection of Pb2+ in Drinking Water Using a Low-Cost Ionophore Based Sensing Scheme

2018 ◽  
Author(s):  
Aron Hakonen ◽  
Niklas Strömberg
Keyword(s):  
Drinking Water ◽  
Tap Water ◽  
Low Cost ◽  
Consumer Products ◽  
Lead Ion ◽  
Eye Detection ◽  
Naked Eye ◽  
Highly Sensitive ◽  
Naked Eye Detection

Drinking water contamination of lead from various environmental sources, leaching consumer products and intrinsic water-pipe infrastructure is still today a matter of great concern. Therefore, new highly sensitive and convenient Pb2+ measurement schemes are necessary, especially for in-situ measurements at a low-cost. Within this work dye/ionophore/Pb2+ co-extraction and effective water phase de-colorization was utilized for highly sensitive lead measurements and sub-ppb naked-eye detection. A low-cost ionophore Benzo-18-Crown-6-ether was used, and a simple test-tube mix and separate procedure was developed. Instrumental detection limits were in the low ppt region (LOD=3, LOQ=10), and naked-eye detection was 500 ppt. Note, however, that this sensing scheme still has improvement potential as concentrations of fluorophore and ionophore were not optimized. Artificial tap-water samples, leached by a standardized method, demonstrated drinking water application. Implications for this method are convenient in-situ lead ion measurements.

scholarly journals Modelling-Guided Design of Paper Microfluidic Networks – A Case Study of Sequential Fluid Delivery

2020 ◽  
Author(s):  
Dharitri Rath ◽  
Bhushan Toley
Keyword(s):  
Mathematical Models ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Computational Design ◽  
Engineering Problem ◽  
Richards Equation ◽  
Trial And Error ◽  
Microfluidic Networks ◽  
Paper Microfluidic ◽  
Flow Through

<p>Paper-based microfluidic devices are popular for their ability to automate multi-step assays for chemical or biological sensing at a low cost, but the design of paper microfluidic networks has largely relied on experimental trial and error. A few mathematical models of flow through paper microfluidic devices have been developed and have succeeded in explaining experimental flow behaviour. However, the reverse engineering problem of designing complex paper networks guided by appropriate mathematical models is largely unsolved. In this article, we demonstrate that a two-dimensional paper network (2DPN) designed to sequentially deliver three fluids to a test zone on the device can be computationally designed and experimentally implemented without trial and error. This was accomplished by three new developments in modelling flow through paper networks: i) coupling of the Richards equation of flow through porous media to the species transport equation, ii) modelling flow through assemblies of multiple paper materials (test membrane and wicking pad), and iii) incorporating limited-volume fluid sources. We demonstrate the application of this model in the optimal design of a paper-based signal-enhanced immunoassay for a malaria protein, P<i>f</i>HRP2. This work lays the foundation for the development of a computational design toolbox to aid in the design of paper microfluidic networks.</p>

High Performance Liquid Chromatographic Determination of Difenzoquat Residues in Water

1982 ◽  
Vol 65 (5) ◽  
pp. 1097-1101
Author(s):  
Ijaz Ahmad
Keyword(s):  
Water Samples ◽  
High Performance ◽  
Tap Water ◽  
Chromatographic Determination ◽  
High Performance Liquid Chromatographic ◽  
Methyl Sulfate ◽  
Liquid Chromatograph ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A simple analytical method is described for the quantitative determination of difenzoquat (1,2- dimethyl-3,5-diphenyl-lH-pyrazolium methyl sulfate) residues in water. The method involves high performance liquid chromatography with ultraviolet detection at 255 nm. The procedure is used to determine 2 ppb to 1 ppm levels of difenzoquat in pure and tap water. Samples which contain ≥50 ppb difenzoquat are injected directly into the liquid chromatograph without prior separation, concentration, or purification. Samples containing ≤50 ppb difenzoquat are first enriched on C18 Sep-Pak reverse phase cartridges and then injected into the liquid chromatograph. Average recoveries of difenzoquat were greater than 92% with a coefficient of variation less than 4.5%. The method can be used for water samples with difenzoquat concentrations as low as 2 ppb.

scholarly journals Flame Atomic Absorption Determination of Trace Amounts of Cadmium After Preconcentration Using a Thiol-Containing Task-Specific Ionic Liquid

2011 ◽  
Vol 94 (3) ◽  
pp. 959-967 ◽  
Author(s):  
Maryam Mohamadi ◽  
Ali Mostafavi
Keyword(s):  
Ionic Liquid ◽  
Atomic Absorption ◽  
Tap Water ◽  
Low Cost ◽  
Absorption Spectrometry ◽  
Aqueous Samples ◽  
Cadmium Ions ◽  
Flame Atomic Absorption ◽  
Task Specific Ionic Liquid

Abstract Dispersive liquid–liquid microextraction (DLLME) based on a task-specific ionic liquid (TSIL) was developed for the extraction and preconcentration of trace amounts of cadmium from aqueous samples, followed by flame atomic absorption spectrometry (FAAS) determination. In the proposed approach, cadmium ions are extracted from aqueous samples using small volumes of trioctylmethylammonium thiosalicylate (TOMATS) dissolved in acetone. TOMATS is a thiol-containing TSIL that can form metal thiolate complexes due to the chelating effect of the ortho-positioned carboxylate group relative to the thiol functionality. The main parameters affecting the performance of DLLME based on TSIL, such as pH, amount of TOMATS, extraction time, injection volume, salt addition, and centrifugation time, were optimized. Under optimum conditions, an LOD of 1.16 ng/mL and a good RSD of 1.8% at 60.0 ng/mL were obtained (n = 7). The proposed method was applied to tap water, wastewater, well water, and milk samples. The results showed that DLLME based on TSIL combined with FAAS is a rapid, simple, sensitive, selective, low cost, volatile organic solvent-free, and efficient analytical method for the separation and determination of trace amounts of cadmium ions.

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