A miniaturized UV-LED array chip-based photochemical vapor generator coupled with a point discharge optical emission spectrometer for the determination of trace selenium

Abstract

An ultraviolet light emitting diode (UV-LED) array chip as irradiation source for nano-TiO2 catalyzed photochemical vapor generation (PCVG) was combined with a hollow electrode point discharge microplasma optical emission spectrometer...

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…They focussed on how Ca concentration, acid molarity and matrix elements effected IRs, and found that matching Ca intensities to within 2% of each other produced the most consistent d 40 Ca/ 44 Ca data. The radiogenic ratio, expressed as 3 40 Ca, is determined with internal normalisation to 42 Ca/ 44 Ca and was found to be reproducible to ±0.48&. From this, the Moynier et al study was able to determine an average value of d 44 Ca/ 40 Ca for the Solar System (relative to SRM915a) of 0.57 ± 0.04& (2 sd).…”

“…A miniaturised UV-LED on-a-chip was developed by Li et al 42 for PVG of Se. The PV generator was comprised of a quartz coil, internally coated with nano-TiO 2 as catalyst, placed over a UV-LED chip which contained 9 LED beads (370 nm, 50 W).…”

Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System

“…For on-line photochemical reactions, the typical light sources used are low-pressure Hg lamps (strong emission band at 254 nm), which are inexpensive and easy to handle. However, UV-light-emitting diode (UV-LED) and excimer lamps have emerged as alternatives as they can emit light at specific UV wavelengths for photochemical synthesis, , degradation of chemical substances, , and pathogen and viral inactivation. , These light sources can achieve higher selectivity and sensitivity in analytical techniques involving on-line photochemical reactions. , …”

“…32,33 These light sources can achieve higher selectivity and sensitivity in analytical techniques involving online photochemical reactions. 34,35 Herein, we report the photochemical conversion of NO 2…”