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(2) Platinized platinum electrodes (PPEs) are platinum electrodes covered with a thin layer of platinum black. These electrodes are used when wide-range conductivity measurements are required or for measuring conductivity under strongly acidic or alkaline conditions. Both the substitution or elimination of lead in PPEs and the substitution of PPEs with other types of electrodes are scientifically and technically impracticable under these conditions.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-18 · Text as adopted (Official Journal); later amendments are not incorporated in this text.