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Frans_M_Everaerts_Isotachophoresis_378342.pdf

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INJECTION SYSTEMS<br />

Fig.7.5. Injection block suitable for isotachophoretic analysis. 1 = Reservoir for the terminating<br />

electrolyte; 2 = PTFE-lined Hamilton valve (1MM1); 3 = silicone rubber septum; 4 = tap provided<br />

with a conical tip, which gives the connection towards drain; 5 = narrow-bore tube, provided with<br />

a Perspex clamping piece (see section 7.2.3). This clamping piece is provided with a small O-ring for<br />

a liquid-tight connection with the injection block.<br />

Of course, as sharp a plug profile can never be obtained as when the sampling is performed<br />

with a sample tap.<br />

The connection with the narrow bore tube is made by the construction discussed in<br />

209

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