RECENDT GmbH – Brand Comparison

This work was carried out in the course of the MODERNA-project under the Programme Beyond Europe, sponsored by the Austrian Federal Government in collaboration with the Austrian Research Promotion Agency FFG under the contract #874147

The graph shows the characteristic peak of Melamine at different concentrations – from 10 to 0.1 ppm on SERSitive S-Silver Substrates and commercially available paper substrates from different company. According to what Rober Zimmerleiter said the concentration of 0.1 ppm is not the limit of detection of S-Silver substrates.

Laser wavelength: 785 nm
Laser power: 145 mW
Laser spot size: 150-170 µm
Integration time: 1000 ms
Averaging: 10x
Solvent: H₂O
Raman Spectrometer: Wasatch Photonics
Lens magnification: No magnification was used, just a regular Raman-Probe
Sampling method: drop: “10µl of analyte were pipetted onto the substrate”
The substrate used: S-Silver hydrophilic

Measured by:
Dipl.‑Ing. Robert Zimmerleiter
Research Scientist
RECENDT GmbH – Research Center for Non-Destructive Testing GmbH
Science Park 2, Altenberger Strasse 69, 4040 Linz, Austria
Tel.: +43 732-2468-4624
robert.zimmerleiter@recendt.at
www.recendt.at