Next Article in Journal
A Joining Procedure and Synchronization for TSCH-RPL Wireless Sensor Networks
Previous Article in Journal
American Sign Language Recognition Using Leap Motion Controller with Machine Learning Approach
Previous Article in Special Issue
Ruthenium Oxide Nanorods as Potentiometric pH Sensor for Organs-On-Chip Purposes
Open AccessFeature PaperArticle

Simultaneous Detection of Ammonium and Nitrate in Environmental Samples Using on Ion-Selective Electrode and Comparison with Portable Colorimetric Assays

1
The Birchall Centre, Lennard-Jones Laboratories, Keele University, Keele ST5 5BG, UK
2
Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai 90112, Thailand
3
Department of Chemistry, Faculty of Science, Prince of Songkla University, Hat Yai 90112, Thailand
4
Department of Physics, Faculty of Science, Prince of Songkla University, Hat Yai 90112, Thailand
5
School of Architecture, Building and Civil Engineering, Loughborough University, Ashby Road, LE113TU Loughborough, Leicestershire, UK
6
School of Geography, Earth and Environmental Sciences and Birmingham Institute of Forest Research, University of Birmingham, B15 2TT Birmingham, Edgbaston, UK
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(10), 3555; https://doi.org/10.3390/s18103555
Received: 4 September 2018 / Revised: 30 September 2018 / Accepted: 4 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Potentiometric Chemical Sensors)
Simple, robust, and low-cost nitrate- and ammonium-selective electrodes were made using substrate prepared from household materials. We explored phosphonium-based ILs and poly (methyl methacrylate)/poly(decyl methacrylate)(MMA-DMA) copolymer as matrix materials alternative to classical PVC-based membranes. IL-based membranes showed suitability only for nitrate-selective electrode exhibiting linear concentration range between 5.0 × 10−6 and 2.5 × 10−3 M with a detection limit of 5.5 × 10−7 M. On the other hand, MMA-DMA—based membranes showed suitability for both ammonium- and nitrate-selective electrodes, and were successfully applied to detect NO3 and NH4+ in water and soil samples. The proposed ISEs exhibited near-Nernstian potentiometric responses to NO3 and NH4+ with the linear range concentration between 5.0 × 10−5 and 5.0 × 10−2 M (LOD = 11.3 µM) and 5.0 × 10−6 and 1.0 × 10−3 M (LOD = 1.2 µM), respectively. The power of ISEs to detect NO3 and NH4+ in water and soils was tested by comparison with traditional, portable colorimetric techniques. Procedures required for analysis by each technique from the perspective of a non-trained person (e.g., farmer) and the convenience of the use on the field are compared and contrasted. View Full-Text
Keywords: ion-selective electrodes; environmental analysis; soil analysis; electrodes versus colorimetric assay ion-selective electrodes; environmental analysis; soil analysis; electrodes versus colorimetric assay
Show Figures

Figure 1

MDPI and ACS Style

Choosang, J.; Numnuam, A.; Thavarungkul, P.; Kanatharana, P.; Radu, T.; Ullah, S.; Radu, A. Simultaneous Detection of Ammonium and Nitrate in Environmental Samples Using on Ion-Selective Electrode and Comparison with Portable Colorimetric Assays. Sensors 2018, 18, 3555.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop