Industrial hygiene

Adkins, John; Henry, Norman W.

doi:10.1021/ac00060a009

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…These prefabricated electrodes could be easily cleaned and modified prior to incorporation into an ePAD and without damaging the paper substrate. Previous work by our group further studied the use of microwires in contact with paper and found that they provided higher flux of species to the electrode surface and improved electrochemical performance from paper-based electrodes reported in the literature and fabricated carbon ink electrodes. , Although microwire electrodes have been incorporated into ePAD devices, , these devices employed quiescent solutions.…”

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confidence: 99%

Development of a Quasi-Steady Flow Electrochemical Paper-Based Analytical Device

2016

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An electrochemical paper-based analytical device (ePAD) was developed for quasi-steady flow detection at microwire electrodes, for the first time. The device implements a fan shaped geometry connected to an analysis channel whereby solution is pulled from an inlet, through a channel, and into the steadily increasing capillary network of the fan. The network counteracts the decrease in solution flow rate associated with increasing viscosity within the channel, generating quasi-steady flow within the analysis channel. Microwire electrodes were embedded between two paper layers within the analysis channel, such that solution flow occurred on both sides of the wire electrodes. The quasi-steady flow ePAD increased the current by 2.5 times and 0.7 times from a saturated channel with no flow and from a single-layer paper device with flow, respectively. Amperometric detection was used for flow injection analysis (FIA) of multiple analytes at both Au and Pt microwire working electrodes, both of which provided similar sensitivity (ca. 0.2 mM) when normalized to the same standard. The two-layer paper devices provided a detection limit of 31 μM for p-aminophenol (PAP) using Pt electrodes and was also used to detect enzyme activity for the reaction of β-galactosidase with p-aminophenyl-galactopyranoside (PAPG). Measured enzyme kinetics provided similar V (0.079 mM/min) and K (0.36 mM) values as those found in the literature. This device shows great promise toward use in enzyme-linked immunosorbent assays or other analytical techniques where flow or washing steps are necessary. The developed sensor provides a simple and inexpensive device capable of performing multiple injection analysis with steady-flow and online detection that would normally require an external pump to perform.

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confidence: 99%

Development of a Quasi-Steady Flow Electrochemical Paper-Based Analytical Device

2016

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“…Air can be sampled with a number of techniques, depending on the analyte of interest. Some of these techniques include grab sampling air with stainless steel canisters or nylon bags, concentration over a sorbent bed, colorimetric tubes, portable real-time detectors, passive monitors, and others. , The ideal scenario is invariably an extremely cost effective yet very accurate evaluation of the airborne analyte concentration, which are two opposing demands. In practice, an acceptable balance is always sought among the speed of analysis, accuracy, practicality of sampling, the instrument used for quantitation, and total cost.…”

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confidence: 99%

“…Whole air sampling in stainless steel canisters alleviates some of the drawbacks with active sampling yet they introduce different problems such as the requirement for costly GC interfaces. Passive sampling for airborne hydrocarbons with charcoal beds , provides a good substitute to the active sampling methods, but the analysis maintains the use of toxic solvents for chemical desorption and the system is limited by interfering organics from the charcoal bed holder, which increase method detection limits.…”

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confidence: 99%

Calibration of Solid Phase Microextraction for Air Analyses Based on Physical Chemical Properties of the Coating

1997

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“…11 Thus anaerobic processes occur with formation of toxic products which are the actual cause of gradual harmful pollution of water. 12 In addition to that, bacteria present in water bring about decomposition of the two kinds of contaminants, which results in formation of further decomposition products, such as polyethylene glycol, which is a typical decomposition product of a nonionic surfactant: it helps to monitor the contamination of environment by this type of pollutant.…”

Section: Introductionmentioning

confidence: 99%

Combination of Solid Phase Extraction With Supercritical Fluid Extraction for the Determination of Contaminants in Water

Adam¹,

Ventura²,

Jandera³

et al. 2000

Journal of Liquid Chromatography & Related Technologies

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The applicability of supercritical fluid extraction was studied for the determination of mineral oil contaminants in the presence of non-ionic surfactants in water after a prior preconcentration on a solid sorbent. The species representative of the two types of contaminants were retained first on a solid sorbent Separon SGX C18. Under optimized conditions supercritical fluid extraction (SFE) with carbon dioxide was used in the first step to extract selectively mineral oil, to be determined by FTIR in a carbon tetrachloride solution. In the second step, SFE with carbon dioxide modified with 5 % (v/v) of methanol yielded a selective and quantitative separation of a non-ionic surfactant into methanol with UV spectrometric finish. A new design of column for retention of species from SFE with the use of a solid sorbent was also developed and tested.

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Industrial hygiene

Cited by 6 publications

References 3 publications

Development of a Quasi-Steady Flow Electrochemical Paper-Based Analytical Device

Development of a Quasi-Steady Flow Electrochemical Paper-Based Analytical Device

Calibration of Solid Phase Microextraction for Air Analyses Based on Physical Chemical Properties of the Coating

Combination of Solid Phase Extraction With Supercritical Fluid Extraction for the Determination of Contaminants in Water

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