Recent advances in fluorescence chemosensors for ammonia sensing in the solution and vapor phases

Abstract

Developing low-cost and reliable sensor systems for the trace detection of toxic gases is an important area of research. Ammonia (NH3) is a commonly produced industrial chemical and a harmful...

Photoacoustic Spectroscopy Using a Quantum Cascade Laser for Analysis of Ammonia in Water Solutions

“…In contrast, photoacoustic (PA) sensing schemes incorporating laser sources have shown robust sensitivity under diverse ambient air conditions. − Despite the general reliability of spectrophotometry, which relies on the Berthelot reaction, it still suffers from long analysis times for ammonia nitrogen analysis . Fiber-optic sensing, another approach employed for the same purpose, has demonstrated promising detection results but with limited repeatability. , Additionally, fluorescence-based detection methods face challenges such as reagent optimization and the complexity of the sample matrix. ,, Before proceeding further, a brief comment on complementary Terahertz (THz) detection technologies is due. Substances such as NH 3 and deuterated ammonia (NH 2 D) have several absorption signatures in the THz range (100 GHz to 10 THz).…”

“… 16 , 17 Additionally, fluorescence-based detection methods face challenges such as reagent optimization and the complexity of the sample matrix. 10 , 18 , 19 Before proceeding further, a brief comment on complementary Terahertz (THz) detection technologies is due. Substances such as NH 3 and deuterated ammonia (NH 2 D) have several absorption signatures in the THz range (100 GHz to 10 THz).…”

Electrochemical sensing mechanism of ammonium ions over an Ag/TiO2 composite electrode modified by hematite

“…Several techniques have been utilized for ammonia nitrogen determination, including titration, spectrophotometry, fluorometry, colorimetry, and potentiometry. [1][2][3][4] However, these techniques suffer from several limitations for practical applications in terms of time consumption, employing toxic reagents, and pre-treatments of water samples. By comparison, electrochemical methods might provide simpler, faster and more sensitive real-time detection, and have a wide range of applications.…”

Integrated portable food safety testing pipette based on a color-switchable fluorescence probe for rapid visual discrimination of mild food deterioration

“…Biogenic amines, produced from the degradation of proteincontaining food during spoilage or endogenous tissue metabolism, 1,2 can cause severe food poisoning in overdose, and thus have long been deemed as an important biomarker for monitoring food quality. 3,4 Accordingly, various methods have been reported for detecting biogenic amines, 5 such as spectrophotometry, 6 chromatography, 7,8 electrochemical device, 9 SERS methods, 10 electronic nose, 11 near-field communication (NFC) labeling technology, 12 etc. However, most of these technologies rely on expensive instruments, rigorous experimental environments, and professionally trained operators, remaining in the laboratory research stage.…”