Automatic integrated system for catalytic spectrophotometric determination of vanadium in water samples

Abstract

Automatic microfluidic system for catalytic spectrophotometric determination of vanadium.

The Role of Automation in the Analysis of Manganese in Environmental Water Samples

“…Chips have been coupled with MSFIA to improve their performance-observing advantages in terms of a wide working range and sample throughput [59]. Particularly for the determination of Mn species in water, this technique has been applied with catalytic spectrometric methods.…”

“…Solenoid valves (V1, V2, V3, and V4) enabled the connection of each syringe either to the chip or to the corresponding solution reservoir for refilling. The chip was built based on the work by Abouhiat et al (2014) [59] and used three PMMA (poly methyl methacrylate) pieces of 85 × 44 × 10 mm. The multisyringe module and an autosampler were linked sequentially, utilizing an RS232C interface, to a personal computer-enabling remote control.…”

Kinetic-catalytic method for sequential determination of iron and copper using a chip coupled to a multipumping flow system

“…9 Monolithic ow conductors, called "chips" were rstly used by the authors in the automation of catalytic analytical methods which require temperatures different to the environment for reaction and/or measurement. 18,19 In this work, a fully automated kinetic-catalytic method for Fe and Cu determination is developed. A MPFS coupled to a chip is proposed for the analytical procedure automation and system size reduction, improving the mixing efficiency of the involved reagents and the temperature control in the integrated reaction coil.…”

Novas abordagens para exploração de reações químicas relativamente lentas em sistemas de análises em fluxo. Aplicações a amostras de relevância agronômica e ambiental

“…Nesse procedimento, uma alíquota da amostra de 200 µL contendo V(V) era injetada por uma válvula de 6 vias e se misturava com os reagentes verde de malaquita e bromato adicionados por confluência em uma bobina de reação de 10 m. O meio micelar favorecia o desenvolvimento da reação, pelo aumento da taxa de colisões entre os reagentes e o catalisador. O limite de detecção foi estimado em 5,2 ng mL -1 e o sistema analisava 20 amostras por hora.Um procedimento analítico utilizando multisseringas era acoplado a uma plataforma microfluídica para a determinação de V(V) pela oxidação de óxido gálico com bromato e catalisada por V(V) a 40ºC(ABOUHIAT et al, 2014). As medidas das intensidades das absorbâncias eram feitas espectrofotometricamente a 384 nm.…”