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The handling of the processed samples also belongs to the sample preparation. For this purpose, the samples are transferred into suitable sample bottles with closure, from which the sample is directly applied and subsequently injected for analysis. After sample processing, the sample solution is transferred into a suitable sample vessel and sealed to prevent evaporation of the sample until the injection time. For an optimal analysis, it is also necessary to take into account the quality of the sample bottles and septa of the closures.
In our range, you will find bottles with the following bottles: headspace edge (chamfered edge), DIN roll edge (flat edge), special roll edge for SPME bottle (thicker roll edge), snap ring, melted edge (flat bottom glass), short thread ND9, fine thread ND18 for headspace and SPME, snap lid edge (sample storage vessel, no autosampler bottle).
When designing the bottle bottom you can choose between the following bottoms: flat bottom, rounded bottom (HS bottom), round bottom, conical bottom, solid glass bottom and a microliter bottle with inner cone.
In the following excerpt from our current catalog you will find an overview of the most important bottle types listed above:
You can also find a selection of sample bottles with different bottoms designs in our Analytic Shop. An overview of the most important types is shown below:
The analysis of PFAS, for example in drinking water, is becoming increasingly important. When performing the analysis, the choice of the right vials and closures is crucial. Sample bottles made of PP are ideally suited for the analysis of PFAS. The adsorption effects are low with plastic bottles and the signal strengths of the analytes are high. Polypropylene bottles are therefore better suited for PFAS analysis than glass bottles or silanized glass bottles. Possible contamination by the plastic of the bottles or the septa material can be neglected: Even with PFBA, the detection rate is below 1 %.
|Volume||ND||Height x Diameter||Model variant|
|1,5 mL||9||32 x 11,6 mm||screw neck vial with filling lines|
|0,3 mL||9||32 x 11,6 mm||screw neck vial with inner cone|
|0,3 mL||11||32 x 11,6 mm||snap ring vial with inner cone|
In order to optimally dissolve both short- and long-chain PFAS in the vessels, the sample solution should have a relative proportion of methanol of 40 - 60 %. Also, for reliable PFAS analysis fluorine-free septa are required to prevent any migration of fluorine into the sample. Suitable caps are e. g. fluorine-free N 9 screw caps or N 11 snap ring caps.