Gas detection is important for controlling industrial and vehicle emissions, household security environmental monitoring. In recent decades many devices have been developed detecting CO(2), CO, SO(2), O(2), O(3), H(2), Ar, N(2), NH(3), H(2)O several organic vapours. However, the low selectivity or high operation temperatures required when most gas sensors are used prompted study of new materials properties that come about from using traditional in a nanostructured mode. this paper, we...

Keeping the doctor away: An aptamer attached to an electrode coated with single-walled carbon nanotubes interacts selectively bacteria (see picture). The resulting electrochemical response is highly accurate and reproducible starts at ultralow concentrations, thus providing a simple, selective method for pathogen detection. Detailed facts of importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...

Detecting and identifying pathogen bacteria is essential to ensure quality at all stages of the food chain diagnose control microbial infections. Traditional detection methods, including those based on cell culturing, are tedious time-consuming, their further application in real samples generally implies more complex pretreatment steps. Even though state-of-the-art techniques for detecting microorganisms enable quantification very low concentrations bacteria, date it has been difficult...

The development of ion-selective electrodes (ISEs) using solid-state transducer materials is great interest for advanced potentiometric detection systems. At present, conducting polymers are the most used transducing materials. However, their reliability strongly related to chemical stability and formation internal water films. Here we report on use reduced graphene oxide (RGO) films different thicknesses as in all-solid-state ISEs. First, transduction mechanism fully analyzed, revealing...

This review intends to illustrate the fruitful collaboration between chemometrics and cultural heritage science. It showcases past achievements, aiming inspire numerous researchers who have yet incorporate multivariate techniques in analysing their research findings. The goal is practically discuss applications with examples extracted from literature. These range most basic early applications, influenced by limited laboratory equipment available at those times, more contemporary endeavours....

Validation of analytical methods.In this paper we shall discuss the concept method validation, describe various elements and explain its close relationship with fitness for purpose.Method validation is based on assumption that a series requirements are fulfilled how these selected, way in which evidence supplied what work has to be carried out laboratory.The basic principles different ways validate methodology, by inter-laboratory comparison or performing an in-house also described.

In this study, we developed a potentiometric planar strip cell based on single-walled carbon nanotubes that aims to exploit the attributes of solid-contact ion-selective electrodes for decentralized measurements. That is, and reference have been simultaneously miniaturized onto plastic substrate by screen-printing drop-casting techniques, obtaining disposable cells with satisfactory performance characteristics (i.e., sensitivity is 57.4 ± 1.3 mV/dec, response time ≤30 s within linear range...

A solid contact ion-selective electrode using for the first time multi-walled carbon nanotubes (MWCNT) transducer material was developed detecting perchlorate in water. To demonstrate excellent ion-to electron ability of MWCNTs, a 15 µm thick layer carboxylated MWCNT deposited between an acrylic membrane selective to ions and glassy rod used as substrate electrical conductor. The electrodes showed Nernstian response 57 mV decade−1 (standard deviation 3 over different electrodes) across wide...

The miniaturisation of analytical devices, reduction data acquisition time, or the waste generation throughout process are important requirements modern chemistry, and in particular green chemistry. Green chemistry has fostered development a new miniaturized near-infrared spectroscopy (NIR) spectrometric systems. However, one drawbacks these systems is need for compromise between performance parameters (accuracy sensitivity) aforementioned In this paper, we evaluated capabilities two...

In this paper, a new technique for assessing the accuracy of analytical methods using linear regression is reported. The results newly developed are regressed against obtained reference methods. test based on joint confidence interval slope and intercept line, which calculated taking uncertainties in both axes into account. slope, intercept, variances associated with coefficients bivariate least-squares (BLS). was validated three simulated five real data sets. Monte Carlo method applied to...

A new reduced-size solid-state electrode using carbon nanotubes as the transducing layer has been developed for direct determination of Ca2+ in sap, overcoming problems encountered by commercial ISEs analysing real complex samples. We show that this solid-contact ISE, which can be easily miniaturized, used directly diluted samples without any other pretreatment. The performance parameters ISE include a Nernstian slope and excellent stability, good coefficients selectivity, range linearity...

In this technical note, we report a new all-solid-state planar reference electrode based on single-walled carbon nanotubes and photocured poly(n-butylacrylate) (poly(nBA)) membrane containing the Ag/AgCl/Cl(-) ion system. Single-walled functionalized with octadecylamide (SWCNT-ODA) deposited by drop-casting onto disposable screen-printed are an excellent transducer. The novel potentiometric shows low potential variability (calibration slopes inferior to 2 mV/dec) for wide range of chemical...

A novel potentiometric solid-state reference electrode containing single-walled carbon nanotubes as the transducer layer between a polyacrylate membrane and conductor is reported here. Single-walled act an efficient of constant signal originating from Ag/AgCl/Cl(-) ions system, they are needed to obtain stable signal. Furthermore, we have taken advantage light insensitivity improve analytical performance characteristics previously electrodes. Four different polymers been selected in order...