# The Sludge (Use in Agriculture) Regulations 1989, Paragraph 6

Extent: E+W+S

The analysis requisite to ascertain the concentration of metals referred to in paragraph 4(b) above shall be carried out following strong acid digestion; the reference method of analysis shall be that of atomic absorption spectrometry, and the limit of detection for each metal shall not exceed 10% of the appropriate limit value specified in the soil table or, in the case of chromium, 25 milligrams per kilogram of dry matter.

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Source: https://www.legislation.gov.uk/uksi/1989/1263/schedule/2/paragraph/6 (the official version)
Page: https://openlegislation.uk/sludge-use-in-agriculture-regulations-1989/schedule-2/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.