Fused-silica transfer capillary

The transfer line consists of an electrically heated stainless steel tube, through which an uncoated, yet deactivated fused silica transfer capillary is passed until the end of the plasma injector. All parts of the stainless steel transfer tube are heated, including the part inside the torch box. The ICP-MS instrumentation is prone to signal suppressions and/or instrumental drift. These problems can be compensated by the use of internal standards. In the case of GC-ICP-MS the internal standard can be added to the carrier gas of the GC apparatus. A suitable internal standard is Xenon (Xe) [41]. The 126Xe signal is monitored simultaneously with the other isotopes of interest. In this way instrumental drift and signal suppression can be corrected. 

On-Chip Electrospray, Fig. 4 On-chip ESI-MS device employing a fused silica transfer capillary. The electric contact was established through a stainless steel capillary connected to the silica capillary using a poly(tetrafluor-oethylene) sleeve. Another fused silica capillary... 

The analytical HPLC system is connected to the flow probe by stainless steel capillaries the capillary HPLC system is connected by a fused-silica transfer capillary. 

The residue levels of 46 pesticides, including oxyfluorfen in soil, were determined using GC/ITDMS as described in S ection 3.2.1. The conditions for GC/ITDMS were as follows column, fused-silica capillary (30 m x 0.25-mm-i.d.) with a0.25- am bonded phase ofDB-5 column temperature, 50 °C (1 min), 30 °Cmin to 130 °C, 5 °C min to 270 °C inlet and transfer temperature, 270 and 220 °C, respectively He gas with column head pressure, 12psi injection method, splitless mode. The retention time and quantitation ion of oxyfluorfen were 23.9 min and mjz 252, respectively. ... 

R. P. Belardi, J. Pawliszyn, The application of chemically modified fused silica fibers in the extraction of organics from water matrix samples and their rapid transfer to capillary columns, Water Pollut. Res. J. Can., 24, 179 191 (1989). 

In addition to providing highly selective separations, there are a multitude of other desired characteristics that a gas chromatographic stationary phase should possess. These properties include high viscosity, low surface tension allowing for wetting of the fused silica capillary wall, high thermal stability, and low vapor pressure at elevated temperatures. The stationary phase solvent should also not exhibit unusual mass transfer behavior. 

Analytical. Samples were chromatographed on a Hewlett-Packard 5880A gas chromatograph which was fitted with a 30M fused silica capillary column (DBS) and an automatic sampler. The GC was interfaced to a Hewlett-Packard 3354 Laboratory Automation System (LAS). Raw data was automatically transferred to the LAS where peaks were selected by retention time, integrated and stored in a processed file. Processed data was then transferred... 

Figure 12.7 Chromatograms of a polycarbonate sample (a) microcolumn SEC trace (b) capillary GC trace of introduced fractions. SEC conditions fused-silica (30 cm X 250 mm i.d.) packed with PL-GEL (50 A pore size, 5 mm particle diameter) eluent, THF at a Flow rate of 2.0ml/min injection size, 200 NL UV detection at 254 nm x represents the polymer additive fraction transferred to LC system (ca. 6 p,L). GC conditions DB-1 column (15m X 0.25 mm i.d., 0.25 pun film thickness) deactivated fused-silica uncoated inlet (5 m X 0.32 mm i.d.) temperature program, 100 °C for 8 min, rising to 350 °C at a rate of 12°C/min flame ionization detection. Peak identification is as follows 1, 2,4-tert-butylphenol 2, nonylphenol isomers 3, di(4-fert-butylphenyl) carbonate 4, Tinuvin 329 5, solvent impurity 6, Irgaphos 168 (oxidized). Reprinted with permission from Ref. (14).

Active sampling using dual multisorbent (Carbopack C, Carbopack B and Carbosieve Sill) tubes over a period of eight hours was employed. The sampled VOCs were desorbed using an automated TD system and transferred via a heated fused silica line into a GC. The VOCs were separated on a low bleed capillary column, identified and quantified by their retention times and target and three qualifier ions using mass spectrometric procedures. The details of the analytical procedures can be found elsewhere (Zuraimi et al., 2006). 

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