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Extra info for Computers in Analytical Chemistry
A simple scheme for discrete sampling from a liquid stream is shown schematically in Fig. 4. In this sketch Ci values denote control signals from the controlling computer to the instrumentation equipment. Suppose ti denotes sequentially increasing values of the time variable. At time t<| signal lines C-| and C 2 are activated thereby enabling the 41 Analytical Techniques 1 sampling valve to become 'purged with sample. A little later, at time t2, the same lines are used to isolate the sample volume containing the material to be analysed.
A variety of gaseous chemicals (ethylene oxide, methyl bromide, proplyene oxide and ozone) have been used for this purpose. Because of the possible health risks government agencies lay down strict regulations relating to the addition and use of chemicals in food processing and so it is important to be able to monitor the residual sterilant in a food product. Furthermore, to ensure appropriate levels of protection it is necessary to check that sterilisation units maintain adequate levels of sterilant.
Often, techniques of analysis are required which can be made automatic and, hence, be included in on-line process control instrumentation. Where this is not feasible, standard manual methods have to be employed. Sampling is also an important consideration in food analysis. This often requires the development of special techniques and procedures in order to gain a representative value for the overall composition of the food. Also, because food can rapidly deteriorate, the time span between sampling and analysis may also be an important factor that is likely to influence the results.