Care should be observed to avoid inhalation of the fumes during the collection and analysis process. Uine collection methods vary depending on the analyte being tested. Dugs differ in the way in which they are metabolized in the body, icluding the components that are excreted through the urine. Dpending on the analyte being investigated, uine samples can be collected during different times to minimise interference. Aalysis of urine samples is usually done using the high-performance liquid chromatographMetal contents of a bullet should be collected carefully to avoid picking other contaminants.
Rmnants 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. Ater collection analysis is done to identify and quantify the major, mnor and trace elements in the bullets. Te results can then be interpreted to determine the possibility of a common origin. Cromatography is essential in analysing urine samples for drugs because it is capable of separating very complex mixtures containing drugs and other substances accuracy and precision.
I addition, i requires very small sample sizes, ad the identified components can be collected independently. Uine samples usually contain metabolites of the drugs or remnants of the drugs, tus it is the preferred choice of sample when using chromatography. Tere are several differences between packed columns and capillary columns. Pcked columns have a higher durability, icreased phased selectivity, hgher sample capacity, ad are relatively less expensive. Hwever, tey are also characterised by larger amounts of bleed, icreased loss of particles into the detector and smaller of theoretical plates or efficiency.
Cpillary columns, o the other hand, hve the advantage of larger numbers of theoretical plates, eficiency and higher resolution and inertness. Tey are best used in low ppm to ppt levels of analysis. Athough their phase selectivity options are limited, teir low bleed characteristics and low carrier gas use to the detector allows sensitive detectors such as mass spectroscopy to be used effectively. Oing to its usefulness in identifying individual components of a mixture, gs chromatography has been utilised in forensic. ..
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