Lab Report Gas Chromatography

The mobile phase and stationary phase in the HPLC will involve in the mechanism. The stationary phase in HPLC normally will be the silica gel. The silica gel will help to separate the components in the liquid sample as its particle size, surface properties and pore structure will lead to good separation results of solvent by minimize the length of diffusion path. The silica gel is also inert to most solvent so it can separate various type of chemical compound with high reproducibility. During the separation, the component in sample will interact with the adsorbent material within the pores of the stationary phase.

WCOT columns are capillary tubes that have a thin layer of the stationary phase coated along the column walls. The column walls of SCOT are first coated with a thin layer of adsorbant solid, such as diatomaceous earth and then treated with the liquid stationary phase. SCOT columns are able to hold a greater volume of stationary phase than a WCOT column due to its greater sample

During the process a mixture is separated into several parts called fractions. Mixtures contain different substance with different boiling points, the differences in boiling points is the main reason fractional distillation is effective. The temperature at which a phase change occurs from liquid to vapor is the boiling point. Fractional distillation Column Fractional distillation column is a fractionating column used for separating a mixture into its various

Dalton’s law, as described before, states that the sum of the partial pressures of each component in a solution – two or more volatile compounds – is equal to the total pressure. As this now includes more than one compound when separating volatile substances from each other, fractional distillation must be used. Fractional distillation, which can be viewed as a series of simple distillations, is a method used to separate volatile impurities from its solvent. The main difference is that a column is introduced between distillation flask and head to separate the liquids from each other. This column – of a large surface area with glass or ceramic – provides ample contact between the vapor and liquid phases.

Complex mixtures can be separated and analyze using physical methods. One of it is chromatography. Two components in a mixture are separated by using the different distribution between two non- miscible phases which is stationary phase and mobile phase. The stationary phase exists as liquid or solid and it is fixed in a system. The mobile phase is a fluid which streams through the chromatographic system.

It depends upon chemical reactions in the gas phase in which sample molecules are consumed during the formation of ionic and neutral species. The ion source or the ionizer converts a portion of the sample into ions. There is a wide variety of ionization techniques depending on the state (solid, liquid, gas). An extraction system removes ions from the sample, which are then targeted through the mass analyzer and onto the detector. The mass analyzer sorts the ions by their mass to charge ratio.

INTRODUCTION A gas chromatograph (GC) can be utilized to analyze the contents of a sample quantitatively or in certain circumstances also qualitatively. In the case of preparative chromatography, a pure compound can be extracted from a mixture. The principle of gas chromatography can be explained as following: A micro syringe is used to inject a known volume of vaporous or liquid analyte into the head or entrance of a column whereby a stream of an inert gas acts a carrier (mobile phase). The column acts as a separator of individual or chemically similar components. A column is typically packed with a stationary non-volatile matter (stationary phase).

That being said, in the fractional distillation, the rings act as the trials in the simple distillation (Gilbert 126). The rings increase surface area therefore it is a lot easier for the less volatile compound (acetone) to flow down the column with a greater level of separation (Gilbert

In general, the concept of chromatography is to separate compounds in a mixture, where there is a stationary phase and a mobile phase. The process of obtaining borrelidin starts with column chromatography using silica gel. Column chromatography is a technique that separates chemical from a mixture of substances. The stationary phase is silica gel, and the

Samples separates into the stationary liquid phase, based on their solubilities at the given temperature. The components of the sample called solutes or analytes separate from one another based on their relative vapour. This chromatographic process is called elution.