SM2.2 - Determination of Inorganic Arsenic as Arsenite in Water Samples by a Paper-Based Microfluidic Sensor System
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Sensor Systems and Microfluidics 2
- Author(s)
- S. Kolev, M. Bonacci, M. Almeida - School of Chemistry, The University of Melbourne, Melbourne (Australia)
- Pages
- 390 - 391
- DOI
- 10.5162/IMCS2018/SM2.2
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Sensing using disposable microfluidic paper-based analytical devices (µPADs) meets the increasing needs of rapid, accurate and low-cost monitoring and analysis for environmental protection and healthcare. µPADs utilize the capabilities of cellulose fibres in paper to transport liquids by capillary force. This paper describes the development of a µPAD for the determination of inorganic arsenic in aqueous samples as arsenite (As(III)). This is the first µPAD implementing a hydride generation approach on a paper-based platform for inorganic As determination. Arsine generated by the reaction of As(III) with sodium borohydride diffuses across a hydrophobic porous PTFE (Teflon) tape into the detection zone of the paper-based sensing system where it is oxidized by Au(III). The Au nanoparticles produced as a result of this reaction change the colour of the detection zone which can be related to the concentration of As(III) being reduced to arsine. Under optimal conditions the µPAD is characterized by a limit of detection of 0.99 mg As(III) L-1.