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In the latter case, SI traceability suggests the notion of values that are independent from the location and the time. It is hardly possible to trace results back to the mole since, strictly speaking, there is no ‘standard mole’ in chemistry, and we hence rely on the kg unit (which is necessary to define the mole). g. in mol kg-’ (de Bi2vre and Taylor, 1997). g. g kg-*. Def iri ition s 43 A recent example illustrates the discrepancy between theory and reality. The maximum authorized concentration of nitrates (after the Drinking Water EC Directive) in water for human consumption is 50 mg 1-I.

Freseiiius’ Z. Aiial. , 359, 473-475. Valchcel, M. , 1999. ‘Traceability in chemical measurements for the end user’. Trerids Anal. , 18, 570-584. , Maier. , Walsh, M. , Rius, F. , Adams, F. and Albus. , 1998. Metrology in Chemist? and Biology: A Practical Approach, EUR 18405 EN. European Commission: Brussels, Belgium. Walsh. ,1999. ‘Moving from official to traceable methods’. Trends Arurl. , 18, 616-623. Wells, D. E. and Kelly, A. , 1991. ‘Progress in the quality assurance of environmental trace organic analysis’.

G. specificity, sensitivity, linearity, detection and determination (or quantification) limits, trueness, precision, robustness, etc. 1 Units of the ‘Systkme International’ (SI) The SI system is the international reference for physical and chemical measurements. The following sections recall the basic units which are relevant to chemical analyses. Historical aspects leading to the establishment of the units described below are described in detail by Wilson and Weir (1995). The metre Following the establishment of the metric system at the end of the 18th Century and the adoption of the metre length first as the ten-millionth part of the quadrant of a meridian of the earth, and then as the length of a pendulum with a periodic time of one second, it was decided to make a metre standard (platinum bar) 28 Cerieral Concepts of QMQC which was deposited in the French National Archives.

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