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Lab Report Gas Chromatography

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Introduction Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. The various constituents of the mixture travel at different speeds, causing them to be separated. In fact, the separation is based on differential partitioning between the mobile and stationary phases [1]. Chromatography may be preparative or analytical. The purpose of preparative chromatography is to separate the components of a mixture for later use, and it is a form of purification. For analytical chromatography, it is normally done with smaller amounts of material with the purpose of establishing the …show more content…

It consists of sample injection port, carrier gas cylinder with pressure regulator, column oven, column (open tubular column and packed column), detector and data system.

1. Sample injection port A sample injection port is used to introduce the sample at the head of column. For optimum column efficiency, the sample should not be too large, and should be introduced into the column in vapour form. The slow injection of large samples may results in loss of resolution and band broadening.
The most commonly used method for sample injection is by using a calibrated microsyringe to deliver a sample volume in the range of a few microliters through a rubber septum and then into the vaporization chamber. The temperature of the sample port is usually maintained at about 50°C higher than the boiling point of the least volatile component of the sample.
2. Gas cylinder with pressure …show more content…

Columns vary in length and internal diameter which depends on the application type. There are two general types of column, which are packed column and capillary column (open tubular). Packed columns contain a finely divided, inert, solid support material coated with liquid stationary phase. Most packed columns are 1.5 - 10m in length with an internal diameter of 2-4mm. There are three types of capillary column that commonly used in gas chromatography. These include wall-coated open tubular (WCOT) column, support-coated open tubular (SCOT) column and fused silica open tubular (FSOT) column. In WCOT column, the internal wall of capillary is coated with a very fine film of liquid stationary phase. In SCOT column, capillary tube wall is lined with a thin layer of solid support on to which liquid phase is adsorbed. The separation efficiency of SCOT columns is higher than WCOT columns due to the greater surface area of the stationary phase coating. In FSOT column, the walls of capillary fused silica tubes are strengthened by a polyimide coating. This type of capillary column is flexible and can be wound into coils. All of these three types of capillary column are more efficient than packed

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Coursework Equipment List • Boiling tubes (8) I will use these because this is where I will mix both the sodium carbonate and the strontium nitrate in order to form the precipitate. I need 8 because I am going to add 8 different amounts of strontium nitrate (1-8cm³) to the 8cm³of sodium carbonate. • Measuring cylinder (1) I will use this to measure the 8cm³ of sodium carbonate and the varying amounts of strontium nitrate to put into the test tubes. • Sodium Carbonate (enough to fill 8 boiling tubes with 8cm³/64cm³)

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This addition aids in controlling the reproducibility and retention. Separation of the mixture via RP-HPLC can be done using continuous gradient or stepwise to move out the sample components. For every separation, the ideal gradient and volume must be

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The serial 2-fold dilution were done with a volumetric pipette, its pump, and 10 mL volumetric flasks. Eight different solutions were produced, half of which came from Red 40 and the other half, from Blue 1. These different concentrated solutions were placed in a 10 mL volumetric flask, each labelled with either R for Red 40

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Leah Romero 10/30/2017 Conclusion Lab 3 Chem 102L In lab 3, fundamentals of chromatography, the purpose was to examine how components of mixtures can be separated by taking advantage of different in physical properties. A huge process in this lab was paper chromatography, which was used to isolate food dyes that are found in different drink mixes. The different chromatograms of FD&C dyes were compared to identify which dyes are present in each of the mixes.

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Prior to loading any protein sample, HIC was washed using four different solutions including equilibrium buffer (a highly salt solution 2M (NH4)2SO4), binding buffer (a very high salt solution 4M (NH4)2SO4), Wash buffer (a medium salt solution 1.3M (NH4)2SO4), and TE (elution) buffer (a very low salt solution 10 mM Tris/EDTA). According to the protein chromatography protocol, to prepare the chromatography column, the HIC column shook vigorously to resuspend the beads, the top cap was removed, and the bottom tap was snapped off, allowing the liquid buffer to drain (took 3-5 minutes). Then 2 mL of equilibrium buffer (i.e. 1 mL at a time) was added. The equilibrium buffer was allowed to drain until it reached the 1 mL mark above the white beads, then the column was recapped at each side and stored at room temperature for further

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A small amount of sand was added after the layer of cotton. After that, a layer of silica filled almost 1/3 of the column. Finally, another small amount of sand was added just above the silica. The column was given a little tap with an aspirator to make the silica more compact. Figure 2.

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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.

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