instrumentTWO TXRF is an economically priced non-contact liquid handling solution for total reflection x-ray fluorescence sample preparation.
Preparation of thin layers: The sample solution or suspension is printed as a dense carpet of tiny droplets (e.g. 121 x 10nL) instead of as one large droplet (e.g. 10µL) that is manually deposited onto the target disc. The main benefit of this approach is that the sample is prepared many times on the same area (e.g. 121 times) instead of only once. As a consequence, sample homogeneity is improved, shadow effects are reduced (large crystals, doughnut effect) and, as a result, the reproducibility of TXRF measurements is significantly improved.
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Above printing process can after a user defined waiting time be automatically repeated. The waiting time is typically set such that the samples are dry before the next printing round starts.
How often the sample is printed is defined by the user and determines the total transferred sample volume (e.g. 10 x 121 x 10nL = 12.1µL). For very dilute samples printing them many times on top of each other provides an efficient means to increase the detection sensitivity.
If the heating option is installed and activated the waiting time for complete solvent evaporation between consecutive printing runs can be significantly shortened. For instance, if the discs are heated to 50 °C aqueous samples typically dry already within 5-20 seconds.
200mm /200mm / 50mm
Speed = 300m/s
from 45cm / 45cm / 30cm
to 100cm / 73,5cm / 175cm
from 45 kg
to 180 kg