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Figure 42. The Chain Detector

The Chain Detector

About the same time as James et al. developed the wire transport detector, Haahti and Nikkari (34) described a similar device, simpler in design, that employed a chain loop in place of the wire as  a carrier. A diagram of their apparatus is shown in figure 42. The carrier, a gold chain driven by a synchronous motor, passes through a coating block where it is wetted with the column eluent. The chain then enters an evaporator tunnel, is heated, and the solvent volatilized leaving the solute deposited on the chain. The chain then exits the tunnel into the actual flame of an FID.

Sample: mineral oil and a surfactant, solvent: n-heptane/ethyl alcohol, column: 2 x 300 mm, column packing: silica gel, flow rate: 0.7 ml/min., chart speed: 24 cm/min., evaporator temperature: 150˚C, nitrogen flow: 30 ml/min., hydrogen flow rate: 25 ml/min., oxygen flow rate: 30 ml/min.

Figure 42. Chromatogram Obtained from the Chain Detector