A pump-less discrete opto-fluidic chemical spectrophotometry system (DOCSS) for online in situ monitoring of dissolved contaminants in aqueous media

Abstract

Research Article| June 14 2014 A pump-less discrete opto-fluidic chemical spectrophotometry system (DOCSS) for online in situ monitoring of dissolved contaminants in aqueous media Justus C. Ndukaife; Justus C. Ndukaife 1Department of Electrical and Computer Engineering, Purdue University West-Lafayette, IN 47907, USA2Purdue Water Institute, Purdue University Calumet Hammond, IN 46323, USA E-mail: jndukaif@purduecal.edu Search for other works by this author on: This Site PubMed Google Scholar A. G. Agwu Nnanna; A. G. Agwu Nnanna 2Purdue Water Institute, Purdue University Calumet Hammond, IN 46323, USA Search for other works by this author on: This Site PubMed Google Scholar Shadi Salman; Shadi Salman 2Purdue Water Institute, Purdue University Calumet Hammond, IN 46323, USA Search for other works by this author on: This Site PubMed Google Scholar Magloire C. Fandohan Magloire C. Fandohan 3Department of Mechanical Engineering, Purdue University West-Lafayette, IN 47907, USA Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2014) 63 (7): 560–569. https://doi.org/10.2166/aqua.2014.164 Article history Received: September 13 2013 Accepted: March 07 2014 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Justus C. Ndukaife, A. G. Agwu Nnanna, Shadi Salman, Magloire C. Fandohan; A pump-less discrete opto-fluidic chemical spectrophotometry system (DOCSS) for online in situ monitoring of dissolved contaminants in aqueous media. Journal of Water Supply: Research and Technology-Aqua 1 November 2014; 63 (7): 560–569. doi: https://doi.org/10.2166/aqua.2014.164 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex This paper presents the fabrication of a discrete chemical analyzer system for online monitoring of dissolved ions in water using UV-VIS absorption spectrophotometry. The device is composed of three main components: fluidic, optical, and control. The test cell was designed to also function as a non-invasive volume sensor, and the volume sensing principle was based on light scattering by entrapped water droplets. This design eliminates the need for expensive high-precision syringe pumps for sample introduction into the test cell. The discrete opto-fluidic chemical spectrophotometry system device can be interrogated remotely over the internet, and the performance was evaluated using the spectrophotometric analysis of chromium (VI) with di-phenylcarbazide as model chemistry. The results showed very good stability in the optical absorbance measurements, a method detection limit of 6.38 ppb, and good precision of 3.04% RSD (relative standard deviation) at 50 ppb chromium (VI). Also a linear calibration range of 25 to 1,250 ppb was obtained, and the response was reversible. discrete chemical analyzer, heavy metals, online monitoring, water quality This content is only available as a PDF. © IWA Publishing 2014 You do not currently have access to this content.