This document specifies a method for determining the total content of the following cyclosiloxanes in chemicals for the leather tanning industry:

—     octamethylcyclotetrasiloxane (D4);

—     decamethylcyclopentasiloxane (D5);

—     dodecamethylcyclohexasiloxane (D6);

This method requires the use of gas chromatography (GC) equipped with a single quadrupole mass spectrometer (MS) to identify and quantify the cyclosiloxanes.