[F1PART 5E+W+SMethods of analysis relating to chemical parameters
Textual Amendments
F1Sch. 12 inserted (6.4.2018) by The Natural Mineral Water, Spring Water and Bottled Drinking Water (England) (Amendment) Regulations 2018 (S.I. 2018/352), reg. 1(1), Sch. 2
SECTION 1E+W+SMethods of analysis
Method of analysisE+W+S
17. In relation to a parameter specified in the first column of the table in Part 3 of Schedule 2 (chemical parameters)—
(a)where there is a method of analysis that meets minimum performance characteristics that can be used by a food authority to analyse a sample for the purpose of making a determination in relation to that parameter under paragraph 8, the food authority must analyse the sample using that method of analysis (or using any one of them in a case where more than one method of analysis meets minimum performance characteristics);
(b)where there is no such method of analysis, the food authority must analyse a sample under paragraph 8 using the best available technique not entailing excessive cost.
Minimum performance characteristicsE+W+S
18.—(1) For the purpose of paragraph 17(a), a method of analysis for a parameter specified in the first column of the table in Section 2 (minimum performance characteristics for a method of analysis) is a method of analysis that complies with minimum performance characteristics if it is a method of analysis that—
(a)is capable of measuring concentrations equal to the parametric concentration of that parameter with a limit of quantification of 30% or less of the relevant parametric concentration,
(b)has an uncertainty of measurement that does not exceed the percentage of the parametric concentration for the parameter specified in the second column of the table,
(c)in the case of benzo(a)pyrene, complies, where relevant, with the requirement specified in the third column of the table, and
(d)in the case of cyanide, complies with the requirement specified in the fourth column of the table.
(2) In the case of a parameter specified in the first column of the table in Section 2, where a method of analysis that complies with the requirements of sub-paragraph (1) is used to determine whether the concentration of that parameter exceeds the concentration specified for that parameter in the table in Part 3 of Schedule 2, the result of the analysis carried out using that method of analysis must be expressed using at least the same number of significant figures as the number of significant figures used to specify that parametric concentration in the table in Part 3 of Schedule 2.
Minimum performance characteristics: individual pesticidesE+W+S
19.—(1) For the purpose of paragraph 17(a), a method of analysis for an individual pesticide is a method of analysis that complies with minimum performance characteristics if it is a method of analysis that—
(a)is capable of measuring concentrations equal to the parametric concentration for that pesticide with a limit of quantification of 30% or less of the relevant parametric concentration;
(b)has an uncertainty of measurement that does not exceed 30% of the parametric concentration for that pesticide or, where there is no method of analysis for the pesticide that does not exceed 30% of that concentration, an uncertainty of measurement that does not exceed—
(i)where there is a method of analysis for the pesticide that has an uncertainty of measurement of more than 30% but less than 80%—
(aa)the uncertainty of measurement percentage that applies in relation to that method of analysis, or
(bb)where there is more than one such method of analysis for the pesticide, the lowest of those percentages, or
(ii)80%, where there is not a method of analysis for the pesticide that has an uncertainty of measurement of less than 80%.
(2) Where a method of analysis that complies with the requirements of sub-paragraph (1) is used to determine whether the concentration of an individual pesticide exceeds the parametric concentration specified in the table in Part 3 of Schedule 2 that applies to that pesticide, the result of the analysis carried out using that method of analysis must be expressed using at least the same number of significant figures as the number of significant figures used to specify the parametric concentration that applies to that pesticide in the table.
Alternative minimum performance characteristicsE+W+S
20.—(1) For the purpose of paragraph 17(a), until the end of 31st December 2019, a method of analysis for a parameter specified in the first column of the table in Section 3 (alternative minimum performance characteristics for a method of analysis that may be used until the end of 31st December 2019) is a method of analysis that complies with minimum performance characteristics if it is a method of analysis that—
(a)is capable of measuring parametric concentrations with a trueness not less than the percentage of the parametric concentration specified in the second column of the table,
(b)is capable of measuring parametric concentrations with a precision not less than the percentage of the parametric concentration specified in the third column of the table,
(c)has a limit of detection that does not exceed the percentage of the parametric concentration specified in fourth column of the table, and
(d)in the case of cyanide, complies with the requirement specified in the fifth column of the table.
(2) For the purpose of sub-paragraph (1)(b) and the table in Section 3, “precision” (the random error) is twice the relative standard deviation (within a batch and between batches) of the spread of results from the mean as further described in ISO 5725-1:1994(en) entitled “Accuracy (trueness and precision) of measurement methods and results – Part 1: General principles and definitions” published by the International Organization for Standardization on 22nd December 1994, as amended by ISO 5725-1:1994/Cor 1:1998 entitled “Accuracy (trueness and precision) of measurement methods and results – Part 1: General principles and definitions TECHNICAL CORRIGENDUM 1” published by the International Organization for Standardization on 2nd May 1998.
(3) For the purpose of subparagraph (1)(c) and the table in Section 3, the limit of detection is—
(a)three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter, or
(b)five times the standard deviation of a blank sample within a batch.
Uncertainty of measurementE+W+S
21.—(1) For the purpose of paragraph 18(1)(b) and 19(1)(b), the performance criterion for uncertainty of measurement (k = 2) for a parameter specified in the first column of the table in Section 2 is not less than the percentage specified in the second column of the table of the concentration for the parameter specified in the second column of the table in Part 3 of Schedule 2.
(2) Food authorities must estimate uncertainty of measurement for a parameter specified in the first column of the table in Section 2 at the level of the concentration for the parameter specified in the second column of the table in Part 3 of Schedule 2.
SECTION 2E+W+SMinimum performance characteristics for a method of analysis
| Parameters | Uncertainty of measurement - percentage of the parametric concentration | Other requirements relating to the uncertainty of measurement | Other requirements |
|---|---|---|---|
| Antimony | 40 | ||
| Arsenic | 30 | ||
| Benzene | 40 | ||
| Benzo(a)pyrene | 50 | Where there is no method of analysis for benzo(a)pyrene that has an uncertainty of measurement that does not exceed 50%, the best available method of analysis with an uncertainty of measurement not exceeding 60% must be used. | |
| Boron | 25 | ||
| Bromate | 40 | ||
| Cadmium | 25 | ||
| Chromium | 30 | ||
| Copper | 25 | ||
| Cyanide | 30 | The method of analysis must determine total cyanide in all forms. | |
| 1,2-dichloroethane | 40 | ||
| Fluoride | 20 | ||
| Lead | 25 | ||
| Mercury | 30 | ||
| Nickel | 25 | ||
| Nitrate | 15 | ||
| Nitrite | 20 | ||
| Polycyclic aromatic hydrocarbons— | |||
| (a) individual substance | 25 | ||
| (b) total substances | 50 | ||
| Selenium | 40 | ||
| Tetrachloroethenes— | |||
| (a) individual substance | 50 | ||
| (b) total substances | 30 | ||
| Trichloroethenes— | |||
| (a) individual substance | 50 | ||
| (b) total substances | 40 | ||
| Trihalomethanes— | |||
| (a) individual substance | 25 | ||
| (b) total substances | 40 |
SECTION 3E+W+SAlternative minimum performance characteristics for a method of analysis that may be used until the end of 31st December 2019
| Parameters | Trueness - percentage of the parametric concentration | Precision -percentage of the parametric concentration | Limit of detection -percentage of the parametric concentration | Other requirements |
|---|---|---|---|---|
| Antimony | 25 | 25 | 25 | |
| Arsenic | 10 | 10 | 10 | |
| Benzene | 25 | 25 | 25 | |
| Benzo(a)pyrene | 25 | 25 | 25 | |
| Boron | 10 | 10 | 10 | |
| Bromate | 25 | 25 | 25 | |
| Cadmium | 10 | 10 | 10 | |
| Chromium | 10 | 10 | 10 | |
| Copper | 10 | 10 | 10 | |
| Cyanide | 10 | 10 | 10 | The method of analysis must determine total cyanide in all forms. |
| 1,2-dichloroethane | 25 | 25 | 10 | |
| Fluoride | 10 | 10 | 10 | |
| Lead | 10 | 10 | 10 | |
| Mercury | 20 | 10 | 20 | |
| Nickel | 10 | 10 | 10 | |
| Nitrate | 10 | 10 | 10 | |
| Nitrite | 10 | 10 | 10 | |
| Pesticide – individual substance | 25 | 25 | 25 | |
| Polycyclic aromatic hydrocarbons— | ||||
| (a) individual substance | 25 | 25 | 25 | |
| (b) total substances | 25 | 25 | 25 | |
| Selenium | 10 | 10 | 10 | |
| Tetrachloroethenes— | ||||
| (a) individual substance | 50 | 50 | 50 | |
| (b) total substances | 25 | 25 | 10 | |
| Trichloroethenes— | ||||
| (a) individual substance | 50 | 50 | 50 | |
| (b) total substances | 25 | 25 | 10 | |
| Trihalomethanes— | ||||
| (a) individual substance | 25 | 25 | 25 | |
| (b) total substances | 25 | 25 | 10] |