Teflon Immersion Coils

Teflon Immersion Coils Immersion coils made of Teflon fluorocarbon resin are available with 2.5-mm (0.10-in) ID tubes to... 

In the other method (h), the effluent from the HPLC column was mixed with a mixture of concentrated H2S04, glacial acetic acid, and KI solution, and the mixture was passed through a Teflon reaction coil kept immersed in a 70-80°C water bath. As before, the carrier gas, introduced after denitrosation, carried the liberated NO through a series of cold traps into the TEA. The system worked well with aqueous mobile phases but not with normal-phase solvents. Response for NPRO was linear from 3.5 to 900 ng injection, with a coefficient of variation of 3-5%. The temperature of the reaction coil seemed to be critical for the determination of A-nitro-samines, which are difficult to denitrosate with HI. While a temperature of 23°C was adequate for the denitrosation of NPRO and several A-nitrosoureas, a much higher temperature (up to 70°C) was required for comparable response from NDMA or NPYR. 

Teflon Immersion Coils Immersion coils made of Teflon fluorocarbon resin are available with 2.5-mm (0.10-in) ID tubes to increase overall heat-transfer efficiency. The flexible bundles are available with 100, 160, 280, 500, and 650 tubes with standard lengths... 

Experiments were carried out in a cell filled with electrolyte into which a platinum wire of 0.2 mm diameter and of 1.1 m length was immersed. A 1 mm pitch spiral-shaped wire was coiled on a teflon core of 14 mm diameter. A special device allowed us to change the length of the immersed part of the platinum conductor. 

Proteins 0.08 mol IA1 Na2S04, pH 7 0.26-1.05 Spectrophotometry 10-m coiled reactor (Teflon tubing, 0.5 mm i.d., 1 cm winding diameter) immersed into a 20°C thermostatic water bath. [70]... 

Chemical reactions are usually accelerated by heating. According to van t Hoffs rule, a temperature increase of 10 K increases the reaction speed by a factor of 2. The reaction coil may be heated by immersion in a thermostated bath or by inserting a regulated heating core into the centre of the coil thermally insulated on the outside. In capillary systems the mixing and reaction coil (preferably Teflon) may be wrapped around a temperature controlled electrically heater. 

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