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The Natural Mineral Water, Spring Water and Bottled Drinking Water (Scotland) (No. 2) Regulations 2007

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Regulation 7(2)

SCHEDULE 7Performance characteristics for analysing the constituents in Schedule 6

This schedule has no associated Executive Note
ConstituentAccuracy of parametric value in %Precision of parametric valueDetection limit of parametric value in %

Notes:

1.

The method of analysis used to measure the concentration of the constituents in Schedule 6 shall be able to measure at least concentrations equal to the parametric value with the specified accuracy, precision and detection limits.

2.

Regardless of the sensitivity of the method of analysis, the result must be expressed to the same number of decimal places as the maximum limit set out in Schedule 6 for the particular constituent being analysed.

3.

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

4.

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.

5.

Acceptable precision is equal to twice the relative standard deviation.

6.

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.

7.

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

Antimony252525
Arsenic101010
Barium252525
Cadmium101010
Chromium101010
Copper101010
Cyanide101010
Fluoride101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Selenium101010

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