Straight-line sampler

Particle size reduction is necessary to assure that various materials in the sample have roughly the same particle size [11]. Even after the particle size has been made reasonably uniform, the sample size has to be reduced to a manageable amount that can be analyzed, e.g., 0.5 g from a bulk sample of several kilograms in the example discussed above. Some of the approaches that have been used follow coning and quartering, proportional divider, and straight-line sampler (for details see Ref. [8]). 

Fig. 1.14 (a) Cross-sectional sampler straight path action, in line (b) cross-line (c) oscillating or swinging arc path... 

Special liner types are used for headspace applications. In many cases, the transfer line of a headspace sampler ends in a syringe type needle. Additional liner dead volume and turbulence must be avoided for the transfer of the sample plug into the analytical column. Special straight headspace liners with narrow diameters are available for many GC models. 

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