SU0013740 - Laserfiche WebLink

Home Browse Search

interact with the other phase to differing degrees due to differences in adsorption, ion-exchange, partitioning or size. These differences allow the mixture components to be separated from each other by using these differences to determine the transit time of the solutes through a column. Gas Chromatography- Carrier gas The choice of carrier gas depends on the type of detector that is used and the components that are to be determined. Carrier gases for chromatographs must be of high purity and chemically inert towards the sample such as: 1. Helium(He); 2. Argon(Ar),Nitrogen(N2); 3. Carbon Dioxide (CO2); and 4. Hydrogen(H2). The carrier gas system can contain a molecular sieve to remove water or other impurities. High Performance Liquid Chromotography High Performance Liquid Chromatography(HPLC) is a form of column chromatography that pumps a sample mixture or analyte in a solvent(known as the mobile phase) at high pressure through a column with chromatographic packing material (stationary phase). The sample is carried by a moving carrier gas stream of helium or nitrogen. HPLC has the ability to separate, and identify compounds that are present in any sample that can be dissolved in a liquid in trace concentrations as low as parts per trillion. Because of this versatility, HPLC is used in a variety of industrial and scientific applications, such as pharmaceutical, environmental, forensics, and chemicals. Sample retention time will vary depending on the interaction between the stationary phase, the molecules being analyzed, and the solvent, or solvents used. As the sample passes through the column it interacts between the two phases at different rate, primarily due to different polarities in the analytes. Analytes that have the least amount of interaction with the stationary phase or the most amount of interaction with the mobile phase will exit the column faster. Facility Security: The facility at which the lab premises is located shall be under the oversight of 24-hour surveillance monitoring as well as the supervision of an armed guard. There shall be no public access to the facility. Facility doors shall remained closed and locked except as necessary for personnel access. Prior to exiting a transportation vehicle and transferring cannabis samples into the facility following sample collection, the Lab Director and Sample Technician/Courier shall coordinate with site security personnel to ensure there are no security threats present. Samples shall not be removed from the transport vehicle for transfer into the lab testing premises until the site's access gates are closed and locked.