Determination of arsenic in water samples by Total Reflection X-Ray Fluorescence using pre-concentration with alumina

Gold nanoparticles as a localized surface plasmon resonance based chemical sensor for on-site colorimetric detection of arsenic in water samples

“…M a n u s c r i p t 3 plasma mass spectrometry (ICP-MS) [10], inductively coupled plasma optical emission spectrometry (ICP-OES) [11], X-ray fluorescence (XRF) [12], voltammetry [13] and spectrophotometry [3,14]. These sophisticated analytical techniques needed a sample preparation procedure before the instrumental measurement, which is found to be tedious, time consuming and more amount of reagents are required.…”

Detection of trace arsenic in drinking water: challenges and opportunities for microfluidics

“…144 XRF has been used for the analysis of arsenic in water samples by pre-concentration of the arsenic on to solid substrates such as tape and alumina. 94,95 The latter approach, in which arsenic is pre-concentrated onto alumina particles and then centrifuged into pellets for solid-state analysis, has an LOD of 0.7 µg/L of arsenic in solution. In microfluidics, it is possible to concentrate very high levels of arsenic into very small areas; this will likely increase the sensitivity of such a method and eliminate the need for centrifugation.…”

Speciation of inorganic arsenic in drinking water by wavelength-dispersive X-ray fluorescence spectrometry after in situ preconcentration with miniature solid-phase extraction disks

“…In most cases, As(III) and As(V) were not adsorbed by the chelating disk because these As species are anions and/or neutral forms in the sample solution. However, As(III) and As (V) were found to be partially adsorbed on the chelating disk when Al 3 þ and Fe 3 þ coexisted in the sample water, indicating that the As species reacts with Al [29] and Fe [30] collected by the chelating disk. This problem was resolved by the elution of As using 0.5 mL of a pH 13 sodium hydroxide solution.…”