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Analytical chemistry assignment 12 questions Essay Example

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Analytical chemistry assignment 12 questions

Care should be observed to avoid inhalation of the fumes during the collection and analysis process.Urine collection methods vary depending on the analyte being tested. Drugs differ in the way in which they are metabolized in the body, including the components that are excreted through the urine. Depending on the analyte being investigated, urine samples can be collected during different times to minimise interference. Analysis of urine samples is usually done using the high-performance liquid chromatographMetal contents of a bullet should be collected carefully to avoid picking up of other contaminants. Remnants of a bullet contents can be found at the scene of the shooting and on other objects that were touched by the bullet such as fabric or bodies of the victims. After collection analysis is done to identify and quantify the major, minor and trace elements in the bullets. The results can then be interpreted to determine the possibility of a common origin.Chromatography is essential in analysing urine samples for drugs because it is capable of separating very complex mixtures containing drugs and other substances with reliable accuracy and precision. In addition, it requires very small sample sizes, and the identified components can be collected independently. Urine samples usually contain metabolites of the drugs or remnants of the drugs, thus it is the preferred choice of sample when using chromatography.There are several differences between packed columns and capillary columns. Packed columns have a higher durability, increased phased selectivity, higher sample capacity, and are relatively less expensive. However, they are also characterised by larger amounts of bleed, increased loss of particles into the detector and a smaller number of theoretical plates or efficiency.Capillary columns, on the other hand, have the advantage of larger numbers of theoretical plates, efficiency and higher resolution and inertness. They are best used in low ppm to ppt levels of analysis. Although their phase selectivity options are limited, their low bleed characteristics and low carrier gas use to the detector allows sensitive detectors such as mass spectroscopy to be used effectively.Owing to its usefulness in identifying individual components of a mixture, gas chromatography has been utilised in forensic

Bibliography

Grob, R. L. & Kaiser, M. A. (2004). “Qualitative and Quantitative Analysis by Gas Chromatography.” In Grob, R. L., & Barry, E. F. (Eds.) Modern practice of gas chromatography. John Wiley & Sons. pp 403-460
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preview essay on Analytical chemistry assignment 12 questions
  • Pages: 5 (1250 words)
  • Document Type: Essay
  • Subject: Chemistry
  • Level: Undergraduate
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