anx_V__cpt_1__point_a__text_2
the key indicator acid neutralising capacity (ANC) and the supporting indicators acidity (pH), dissolved sulphate (SO_(4)), nitrate (NO_(3)) and dissolved organic carbon: frequency of sampling: from yearly (in lake autumn turnover) to monthly (streams).
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.