SCHEDULE 10Sampling and analysis for parameters other than radioactive substances in water bottled and labelled as “spring water” and bottled drinking water

PART 1General

Analysis of samples1

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—

    1. a

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

    2. 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.

Authorisation of alternative methods of analysis2

1

The Agency may authorise a method different from that set out in Part 2 if satisfied that it is at least as reliable.

2

An authorisation may be time-limited and may be revoked at any time.

Sampling and analysis by persons other than district councils3

1

A district council may enter into an arrangement for any person to take and analyse samples on its behalf.

2

A district council must not enter into an arrangement under paragraph (1) unless—

a

it is satisfied that the task will be carried out promptly by a person competent to perform it; and

b

it has made arrangements that ensure that any breach of these Regulations is communicated to it immediately, and any other result is communicated to it within 28 days.