# The Materials and Articles in Contact with Food (Wales) Regulations 2012, Paragraph 4


Performance criteria of the instrumental method of analysis
(a) The detection limit for lead and cadmium must be equal to or lower than— 0,1 mg/litre for lead, 0,01 mg/litre for cadmium.
The detection limit is defined as the concentration of the element in the 4 % acetic acid solution, as referred to in paragraph 3(a), which gives a signal equal to twice the background noise of the instrument.
(b) The limit of quantification for lead and cadmium must be equal to or lower than— 0,2 mg/litre for lead, 0,02 mg/litre for cadmium.
(c) Recovery. The recovery of lead and cadmium added to the 4 % acetic acid solution, as referred to in paragraph 3(a), must lie within 80-120 % of the added amount.
(d) Specificity. The instrumental method of analysis used must be free from matrix and spectral interferences.

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Source: https://www.legislation.gov.uk/wsi/2012/2705/schedule/4/paragraph/4 (the official version)
Page: https://openlegislation.uk/materials-and-articles-in-contact-with-food-wales-regulations-2012/schedule-4/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.