allows for smoother penetration of vial and injector septa. SPME fiber advantages: – Original proven design – Solvent-free – Easy to automate – Nondestructive to samples – Fibers are reusable – Compatible with GC or HPLC instrumentation All Aijiren SPME fibers have a standard length of 10 mm and a 23-gauge needle.
Choosing the right septa When choosing proper septa, there are many factors to consider: type of solvent or sample, slit or non-slit design, and reseal ability. These factors ultimately lead to material makeup of the septa. Depending on the material chosen, you must also determine the proper tip diameter and if the septa
Jul 1, 2016 · Choosing the wrong septa can compromise method accuracy and repeatability as well as reduce column life in extreme cases. This installment addresses septa for inlets and sample vials. In gas chromatography (GC), septa form part of the critical juncture between internal passages and the external ambient atmosphere with its oxygen and water.
PTFE/Synthetic Red Rubber Septa: (PTFE/RR) -30 +110 -22 +230 PTFE/ High Perfomance Red Rubber Septa -40 +110 -40 +230 PTFE/Silicone Septa: (T/S) -60 +200 -76 +392 PTFE/Silicone/PTFE Septa: (T/S/T) * -60 +200 -76 +392 PTFE Septa * -200 +250 -328 +482 Polyethylene (PE) * -50 +80 -58 +176 Polypropylene (PP) * 0 +121 32 +250
A mixer is required in all instances when more than one solvent is used as mobile phase. This is to ensure sufficient mixing of all compounds before being introduced to the column. Factors to consider when choosing a mixer: flow rate, solvents used, and type of detector. The mixed mobile phase passes through a valve.
• Aijiren Tech: Optima® LC/MS Grade NOTE:If using solvent brands other than the ones listed above, check with the manufac-turer to verify that the solvents were prefiltered with a 0.2-µm (or smaller) filter. CAUTION: DO NOT PERFORM FURTHER FILTRATION ON PREFILTERED SOLVENTS; ADDITIONAL FILTERING CAN INTRODUCE CONTAMINATION. 1.2 Use ultrapure water
The septum you choose for your autosampler vial can impact sample evaporation, sample security, needle bending and blockages, and instrument down time. Don’t let the complexities of septa selection slow you down. Use the simple online Aijiren Tech SureSTART Selection Guide to find the right septa and vial for your analysis.
A specially moulded seal with a PTFE insert. Sealing surface of Butyl and PTFE affects a more positive seal than non-PTFE-faced septa. Ideal choice for temperatures below 125°C. Good sealing characteristics, excellent resistance to most solvents with reduced coring and high puncture tolerance.
Feb 13, 2023 · Common Septa for LC Vials. The most common vial type for liquid chromatography are screw thread vials and closures. The most common septa used in screw thread closures is a PTFE and silicone combination (commonly shown as PTFE/Sil). PTFE/Sil is a great choice for multiple injections due to its resealing capability.
• Self-sealing septa contain silicone that can interfere with LC/MS applications. • Single-layered septa are acceptable if they do not contain plastics or adhesives that can contaminate the sample manager (PTFE is recommended). 3. Use Aijiren Technology‐brand wellplates. Other brands can leach plasticizers (for example, diisooctyl
Nov 5, 2018 · A: Evaporation of both solvent and analytes can occur over time, even with re-sealing septa like PTFE/Silicon. It is very much dependent on the chemistry of the analytes, the diluent, and the
