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

Regulation 10

SCHEDULE 5N.I.Constituents of natural mineral water

This Atodlen has no associated Memorandwm Esboniadol

PART 1 N.I.Maximum limits for constituents of natural mineral water

1 The constituents described above refer to constituents naturally present in the water at source and not to substances present as the result of contamination.

Constituents1Maximum limits (mg/l)
Antimony0.0050
Arsenic0.010 (as total)
Barium1.0
Cadmium0.003
Chromium0.050
Copper1.0
Cyanide0.070
Fluoride5.0
Lead0.010
Manganese0.50
Mercury0.0010
Nickel0.020
Nitrate50
Nitrite0.1
Selenium0.010

PART 2 N.I.Performance characteristics for analysing the constituents in Part 1

1 The method of analysis used to measure the concentration of the constituents in Part 1 must be capable of measuring concentrations equal to the parametric value with the specified accuracy, precision and detection limits. Regardless of the sensitivity of the method of analysis, the result must be expressed to at least the same number of decimal places as the maximum limit set out in Part 1 for the particular constituent being analysed.

2 Accuracy is the systematic error and represents the difference between the average value of a large number of repeated measurements and the exact value.

3 Precision represents the random error and is expressed in general as the standard deviation (within a batch and between batches) of a sample of results from the average. Acceptable precision is equal to twice the relative standard deviation.

4 The detection limit is—

(a) three times the relative standard deviation within a batch of a natural sample containing a low concentration of the constituent; or

(b) five times the relative standard deviation within a batch of a virgin sample.

5 The method should make it possible to determine cyanide in all its forms.

Constituents1Accuracy of parametric value in %2Precision of parametric value3Detection limit of parametric value in %4
Antimony252525
Arsenic101010
Barium252525
Cadmium101010
Chromium101010
Copper101010
Cyanide 5101010
Fluoride101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Selenium101010