Analytical Methods in The Food Industry by Matchett J.R., et al. (eds.)

By Matchett J.R., et al. (eds.)

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C) Milligram. (d) Megagram. N. (1990) Statistics for analytical chemistry, 3rd edition, Horwood (Ellis), UK. A. and Dent, N. (eds) (1994) Good laboratory and clinical practices: Techniques for the quality assurance professional, Butterworth-Heinemann, Canada. c. (1989) Statistics for biologists, 3rd edition, Cambridge University Press, UK. T. and Jackson, R. (1995) Exploring probability and statistics with spreadsheets, Prentice-Hall, UK. A. ) (1991) Improving safety in the chemical laboratory, 2nd edition, John Wiley, UK.

Atomic absorption Individual atoms cannot rotate or vibrate in the same manner as molecules and as a result the absorption of energy is only associated with electronic transitions that are limited in number and associated with very narrow ranges of radiation or absorption lines. The wavelength that is most strongly absorbed usually corresponds to an electronic transition from the ground state to the lowest excited state and is known as the resonance line. The limited number of electronic transitions for any atom results in the fact that excited atoms, when returning to the ground state, emit radiation of the same wavelength as that which was absorbed.

Which of the following actions should be taken? (a) Reject all the test results. (b) Accept all the test results. (c) Re-analyse the control. (d) Re-analyse the test samples. 3. The imprecision of a method can be assessed by determining the standard deviation of replicate analyses BECAUSE precision falls as random error increases. 4. 5% of the values should exceed the mean value by more than 2 SD. The production of results 29 Every analysis is undertaken for a reason and the results of the analysis should be presented in an unambiguous manner to enable valid conclusions to be drawn.

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