Disposable Colorimetric Paper-Based Probe for the Detection of Amine-Containing Gases in Aquatic Sediments

Abstract

Amine compounds are considered highly important in environmental pollution, industrial, and medicinal fields. The objective of this work was to develop a disposable, highly accurate, highly selective, and low-cost paper-based probe through the combination of color change of seven pH indicators for the detection of amine compounds in the gaseous state. The probe was designed with seven rings which were printed using the wax-printing technique and colored with different pH indicators. The colors of the probe were analyzed using red, green, and blue ( RGB ) values extracted from the images obtained with a homemade smartphone application. The chemometric tools, principal component analysis, and hierarchical cluster analysis methods were adapted to further classify amine gases. The colorimetric probe showed an excellent capability for detecting the amines with high accuracy, prompt response, and high selectivity. These dye arrays have been proven to detect ethanolamine (NH 2 CH 2 CH 2 OH), dimethylamine ((CH 3 ) 2 NH), and trimethylamine ((CH 3 ) 3 N) gases at parts per million scale.

Facile Synthesis of Fe-Doped Hydroxyapatite Nanoparticles from Waste Coal Ash: Fabrication of a Portable Sensor for the Sensitive and Selective Colorimetric Detection of Hydrogen Sulfide

“… 31 , 32 Over other analytical methods, paper test strips have rapidly developed in different areas because of low-cost and easy-to-use analytical tools. 33 Although this commercial test strip is popular and readily available, it has various drawbacks including the toxicity of lead metal and high detection limit. 34 Hence, a sensitive and green probe for the colorimetric detection of H 2 S in the solid phase is highly desirable.…”

Liquid Wicking in a Paper Strip: An Experimental and Numerical Study

“…Different types of open surfaces are used in microfluidic applications such as metal, plastic, , paper, fabric, etc. Paper-based devices have various applications in the field of healthcare diagnosis, environmental monitoring, food quality control, biomedical applications, − etc. Whatman filter paper is used in most of the research studies because it is easily available, cheap, thin, lightweight, disposable, biodegradable, and easy to store and transport .…”

Paper-based sensors for diagnostics, human activity monitoring, food safety and environmental detection

“…In the absence of surface modification, when Clwas present, the unique color change from dark purple to red could be quickly observed by the naked eye within 5 minutes, and the more obvious the color change occurred with the increase in concentration (Figure 13B). Nguyen et al 194…”