SPEX SamplePrep X-Cells are used throughout the world for fast, dependable, reproducible running of liquid samples in XRF spectrometers. Made of contaminant-free polyethylene, closed X-Cells are available in both 31 mm and 40 mm sizes to fit most spectrometers. For special applications there are 31 mm Double Open End and Micro X-Cells, and a 43 mm Closed Cell for Horiba Sulfur Analyzers.

The patented closed X-Cell design features a snap-open seal for venting volatile samples and a reservoir cup for catching any liquids that expand through the vent. This assures the analyst of a smooth, flat window for improved precision, yet guards against spillage in inverted-optic spectrometers. A roughened surface within the reservoir cup facilitates labeling.

Each closed X-Cell consists of a cup and snap-on ring. For routine liquid samples, the cup is filled with liquid, a piece of film is spread over the top, then the snap-ring is pushed down over the cup to form a flat drum-like window. The cell is turned over and, if desired, the snap-post on the rear can be pushed to break the seal and to permit venting of trapped bubbles or expanded liquid while the sample is run. The filled X-Cell is then positioned in the spectrometer mask.

X-Cells can also be used to run solution residues and small quantities of pastes or powders. For solution residues, the film window is prepared as for solutions, then dished slightly with the rounded end of a glass rod. A drop of solution placed there and warmed under an IR lamp dries to a smudge for in situ analysis. If powder or paste is spread on the surface and another piece of film overlaid before snapping on the ring, the sandwiched sample is ready for X-ray analysis. The 3527 40 mm X-Cell can also be used to hold crumbling 31 mm sample discs.

SPEX SamplePrep also supplies versatile Double Open End X-Cells which are ideal for many unusual or hard-to-handle samples: slurries, sludges, pastes, viscous materials such as glue, tar, or RTV sealant, metal films and machine parts, etc. The 3571 X-Cell has a body open at both ends, two snap-on rings, and a collar to hold film in place while the ring is being applied. After window film has been attached to one end of the cell, it can be inverted, and the sample placed, poured, dabbed, or otherwise located in the cell, directly against the window. The top of the 3571 X-Cell can then be left open, sealed  with film, or protected but allowed to “breathe” with a piece of 3524 Microporous Film.

If you deal with small air-sensitive or hazardous samples, then the 3577 Micro X-Cell is the solution to your problems. While it fits in the standard 31 mm sample holder, the window is 6.3 mm in diameter, and only 0.5 ml fills it up. Collimate your beam down to reduce scatter and you’re ready to go. The Micro X-Cell can be run with an open or window back, but it will also accept a 7 x 13 mm serum bottle closure for injection, purging, or the isolation of special samples.