S2 PICOFOX, TXRF Spectrometer, Trace Analysis

Sample Preparation of Oils, Pigments, Thin Layers and Similar

Semi-quantitative analysis of thin layers

  • Cut out a 5x5 mm section of the thin layer with a ceramic knife
  • Fix the section on the center of the carrier with some ultrapure vacuum grease
  • Standardless quantification mode delivers relative element ratios

Quantitative extraction of thin layers

  • Put filter in a 7 ml THF vessel (e.g. Savilex), add 2 ml HNO3 (p.a.) and 20 μl Se IS solution (1 g/L)
  • Place in an ultraconic bath for 15 min
  • Rinse filter with 1 ml HNO3, homogenize and transfer 10 μl to sample carrier

Remarks

  • For the analysis of oils and greases a pipette might not be suitable:

    • Weigh about 500 mg dissolved or liquid sample
    • Add 20 μl organic IS (1 g/L) and homogenize
    • Wipe a thin sample film on the disc (cotton bud)
    • Measure without drying

TXRF benefits

  • Due to the high sensitivity of TXRF, the “organic film“ method delivers instant results
  • Non-destructive measurements of films and foils possible
s2_picofox_diesel_rainbow.jpg
Sample: diesel
s2_picofox_LLD_grease.jpg
Detection limits for industrial grease samples dissolved in organic solvents
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