By Philippe P. Quevauviller, Clive Thompson

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For internal routine action, the use of control charts, based on the mean, spiking recovery, and analysis of blanks, is recommended. In addition, the standard recommends the use of a mean and/or a range control chart and the execution of a minimum of six replicate determinations of the test sample for the calculation of the standard deviation for the control of the precision. 3) sets a requirement to be met for the limit of detection (LOD). The determination of the LOD does not follow a standard method.

Use of the inverse calibration function, consideration of blank values). , dimension, number of significant figures). , result, identification data of the sample, applied standard method). JWBK030-01 JWBK030-Quevauviller August 26, 2005 10:17 28 Char Count= 0 Drinking Water Regulations Interlaboratory trial The presentation of statistical results of data from interlaboratory trials can be handled differently in CEN and ISO. CEN presents these data generally in the normative body of the standard, whereas ISO puts them in the informative annex of the standard.

Provided they give reliable results, these alternative methods could be considered for use in drinking water analysis. ISO 17381 (ISO, 2003c) lists criteria and requirements for the producers and for the users of these tests. JWBK030-01 JWBK030-Quevauviller References August 26, 2005 10:17 Char Count= 0 35 REFERENCES Council Directive 98/83/EC, 1998. 2998, L 330, 32-54. DIN, 1998. A Word about DIN, Berlin, 1998. EN Standard, 1995. EN/ISO 10304-1:1995: Water quality – Determination of dissolved fluoride, chloride, nitrite, orthophosphate, bromide, nitrate and sulfate ions, using liquid chromatography of ions, Part 1: Method for water with low contamination (ISO 10304-1:1992) (under revision: ISO/CD 10304:2004-24-11).

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