May 22, 2020 · Polypropylene (PP) is a non-reactive plastic that can be used where glass is not suitable. Polypropylene sample vials can still maintain a good seal when fired, thereby minimizing the possibility of exposure to potentially hazardous substances. The maximum operating temperature is 135 ℃. The importance of septa.
The low durometer of red rubber allows for easy needle penetration even with thin bore GC needles. PTFE/Red Rubber septa are not recommended for multiple injections with long run times or retention of samples for further analysis after initial puncture. PTFE/Silicone Septa: (T/S)
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Mar 1, 2012 · For headspace samplers with a sample loop, pressurized sample gas from the vial is directed through the sample loop to vent through a restrictor. A minimum sampling interval is required to flush the loop with sample gas. The total sampling interval and initial pressurization determine the residual loop pressure at injection.
Dec 11, 2018 · contamination, a trip blank prepared from organic-free reagent water (as defined in Chapter One) should be maintained with the samples throughout sampling, shipping, and storage. Including activated carbon in the bags containing the sample vials may help reduce concerns related to these potential sources of sample contamination.
Our Cepure line of vial cap septa offers new septum materials and unique processes to improve septum sealing integrity and reduce the risk of sample contamination. Examples include the NT line of low bleed silicone autosampler vial cap septa, the NR line of natural rubber aluminum crimp cap vial septa, and the BR line of high performing butyl
all caps and vials. Reusing caps and vials opens up the possibility of contamination, from solvent (liquid or vapor) interacting with the septa material as well as the atmosphere. This may seriously impact your analytical results, causes by sample contamination, chemical reaction, or evaporation.
777, F.A.C. with leachability concentrations determined on a site-specific basis. Scope This guidance is intended to address the typical situation for using SPLP extraction followed by analysis of the leachate in establishing site-specific leachability values for contaminants in soil. The scenario
vial, cap and septa kits make it surprising simple to re-stock your laboratory. NEW PACK SIZE For your added convenience, the most popular kits are now available in 1000 pack size. Ultra-Low Bleed Septa Our ultra-low bleed septa is the benchmark for high purity septa, eliminating any possibility of contamination. Available in caps
the process flow. Thus, MicroLiter autosampler vials, caps, septa and inserts are available in a variety of formats, individually, component kits or assembled kits. • Vials with Limited Volume Inserts installed decreases the prep time per sample. • Component kits offer the convenience of one product number for the vial cap and septa.
The specific sample containers required will depend on the purge-and-trap system to b e employed (see Sec. 4.2). Several systems are commercially available. Some systems emplo y 40-mL clear vials with a special frit and equipped with two PTFE-faced silicone septa. Othe r
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Contamination can occur from vial cap septa, particularly if more than three injections are made from one vial. Repeated punctures may dislodge septum pieces into the sample. To determine if this is a contamination source, cut a 1- x 2-mm segment from a septum and slurry in a vial with 1 ml of the same solvent used for the sample.
Jun 9, 2022 · Siloxane contamination can interfere with low-level analysis of target compounds whether they are discrete peaks or manifested as high background bleed. They are one of the most common types of “ghost peaks” in gas chromatography (GC) and can come from a variety of sources such as inlet septa, columns, valves, solvents, and vial cap seals.
Although the vial septum coring was likely the same for both samples, since the 2 mL vial contained much more sample, any deleterious effects from the septum pieces in the sample are less pronounced. Still, it is not good practice to (1) puncture a sample vial septum multiple times, or (2) store samples with punctured vial septa.
