NeedlEx, Organic solvent

Organic solvent NeedlEx is used to extract general organic solvents.

The polymer particles contained in this needle adsorb compounds contained in sample gases which pass between the particles through the principle of equilibrium. Because sample gases pass through the side hole of the needle and come into contact with particles at the tip of the needle first, particles reach saturation from the tip of the needle upwards. The needle reaches breakthrough point when all of the particles contained in the needle reach saturation point. Breakthrough capacities differ according to the organic solvent being sampled, but at concentrations below a certain level (100 ng/mL for most solvents), they differ according to the volume of gas sampled rather than the absolute amount of the compound to be analyzed.

Features of NeedlEx
① The NeedlEx enables easy extractions of samples and provides superior reproducibility. By attaching a NeedlEx needle to a gas sampler and simply aspirating a sample, the desired sample can be extracted selectively and accurately concentrated in a very short period of time.
② Adsorbed samples can be stored in NeedlEx needles. Extracted samples can be stored for approximately ten days by sealing both ends of NeedlEx needles using Teflon plugs included with each needle.
③ No additional equipment is required for the adsorption and desorption of samples. Desorption of samples is performed using the heat produced by gas chromatograph injection ports. Extracted samples can be injected into GCs using gas tight syringes and 1 mL of N2.
④ NeedlEx needles can be used repeatedly. By conditioning NeedlEx needles in GC injection ports for 3 minutes after each analysis, needles can be used approximately 25 to 30 times.

The NeedlEx is used to concentrate and accurately analyze solvents present at extremely low concentrations of less than 10 ng/ml (a few ppm). As such, set sampling volumes as low as possible when there is a possibility that the compound to be sampled is present at a high concentration.

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