Vacuum manifold

Samples were prepared by using a vacuum manifold to fill the gas cell. After measuring the total pressure, the absorbance of the sample at 2170 cm- was measured. Results are reported as %CO (Pco/ftot)- Five exhaust samples were obtained from a 1973 coupe, yielding the following results... 

Connect a vacuum manifold to a vacuum source not to exceed 20 in Hg, and place a 1-L waste liquid trap between the manifold and the vacuum source. To use the manifold, remove the cover, and place a Luer hub solvent guide needle on the male Luer fitting of each flow control valve. Remove the collecting vessel rack, and replace the cover. Close all control valves on the manifold cover. 

Place the Cig SPE column on the vacuum manifold, and prepare for extraction by washing the column sequentially three times with approximately 3-mL volumes of methanol and Optima water, respectively. Following the final water wash, allow a volume of liquid to remain on top of the resin bed, and avoid allowing the column to become dry before sample addition. 

SPE purification was carried out continually after the SEE procedure. The SPE tube was mounted on a vacuum manifold and preconditioned with 2 mL acetone and 2 mL of acetone-water (2 1, v/v) successively. The tube was connected with a 25-mL reservoir into which the extract was transferred. After percolation, the tube was rinsed with 10 mL of water-acetone (2 1, v/v) and the sorbent was dried under vacuum for 15 min. The residue was eluted with 5 mL of acetone into a volumetric flask. As well as water-acetone (2 1, v/v), 2 mL of acetonitrile-water (1 1, v/v) were also used for rinsing. ... 

Silica gel mini column, Sep-Pak Plus Silica To set up, attach a Sep-Pak Plus Silica column to a vacuum manifold and rinse with 10 mL of ethyl acetate Empore Cig extraction disks (3M) To set up, attach Cig extraction disks to a two-piece Alter funnel and load 30 g of Filter Aid 400 on its surface. Wash the Alter with 20 mL of acetoniAile and 20 mL of 0.01 M acetate buffer (pH 4) in that order Filter Aid 400 (3M)... 

Visidry vacuum manifold drying attachment, Supelco... 

Reversed-phase Cig chromatography column. Keystone Scientific Betasil, 100 x 2.0-mm i.d., 5-pm particle size, 100 A, Part No. 105-701-2-CPF TSQ 7000 LC/MS/MS system with electrospray ionization (ESI) or atmospheric pressure chemical ionization (APCI) interface and gradient high-performance liquid chromatography (HPLC) unit, or equivalent Vacuum manifold for use with SPE cartridges (Varian Vac Elut 10 or equivalent)... 

Place a silica gel cartridge (1-g, J.T. Baker) on a vacuum manifold and condition the cartridge with 6 mL of ethyl acetate followed by 6 mL of hexane. Do not allow the... 

In the last several years, on-line extraction systems have become a popular way to deal with the analysis of large numbers of water samples. Vacuum manifolds and computerized SPE stations were all considered to be off-line systems, i.e., the tubes had to be placed in the system rack and the sample eluate collected in a test-tube or other appropriate vessel. Then, the eluted sample had to be collected and the extract concentrated and eventually transferred to an autosampler vial for instrumental analyses. Robotics systems were designed to aid in these steps of sample preparation, but some manual sample manipulation was still required. Operation and programming of the robotic system could be cumbersome and time consuming when changing methods. 

Syringe-barrel cartridges, disk-holders, plastic pipette-tips, well plates vacuum manifolds for semiautomatic batch processing fully automated autosamplers, xyz liquid handlers and robot-controlled work stations. 

Vacuum filtration at 18 to 20 in. Hg was performed on a Multiscreen HTS vacuum manifold with a deep well collar. For the SPE, the extraction plate was conditioned first with 100 /.iL of methanol... 

The substituted styrene monomer and azo-Wr-isobutyronitrile initiator were placed in a glass reactor which then was attached to a vacuum manifold. The reactor was evacuated and cooled in a dry-ice-acetone bath. The appropriate quantity of SO2 monomer was distilled into the reactor, the reactor was then sealed under vacuum and placed in a constant temperature bath for three to eight hours. After the... 

Isobutylene (Philips Research Grade) was purified as described [17] by distillation on a vacuum line through a trap containing sodium at 350 °C. It was stored as liquid on a sodium mirror. Solutions in methyl bromide were made up by distilling the required quantities of solvent and isobutylene from hanging burettes along a vacuum line into a reservoir with Teflon tap, which was subsequently cut from the vacuum line and fused to a burette with Teflon tap which was then fused to the main vacuum manifold as shown in Figure 1. 

Apparatus The polymerisation experiments were done in a conductivity cell of the type described [9], which was attached to a vacuum manifold as shown in Figure 1. The measurement of conductivity and the temperature control were done as described [9]. 

Load vacuum manifold ports with DE-81 filters (Whatman). 

A vacuum manifold can be used for conducting multiple extractions... 

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