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The Natural Mineral Water, Spring Water and Bottled Drinking Water Regulations (Northern Ireland) 2015

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Analysis of samples

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1.—(1) The district council must ensure that each sample is analysed in accordance with Annex III to Directive 98/83 and this Schedule.

(2) For each parameter specified in the first column of Table 1 in Part 2 the method of analysis is specified in the second column of that table.

(3) For each parameter specified in the first column of Table 2 in Part 2 the method of analysis is one that is capable of—

(a)measuring concentrations and values with the trueness and precision specified in the second and third columns of that table; and

(b)detecting the parameter at the limit of detection specified in the fourth column of that table.

(4) For hydrogen ion, the method of analysis must be capable of measuring a value with a trueness of 0.2pH unit and a precision of 0.2 pH unit.

(5) The method of analysis used for odour and taste parameters must be capable of measuring values equal to the parametric value with a precision of 1 dilution number at 25 ºC.

(6) For the purpose of this paragraph—

“limit of detection” is—

(a)

three times the relative within-batch standard deviation of a natural sample containing a low concentration of the parameter; or

(b)

five times the relative within-batch standard deviation of a blank sample;

“precision” (the random error) is twice the standard deviation (within a batch and between batches) of the spread of results about the mean;

“trueness” (the systematic error) is the difference between the mean value of the large number of repeated measurements and the true value.

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