Hydrogen sulphide (H2S) detection equipment shall be provided on
board ships carrying bulk liquids prone to H2S formation. It should be noted
that scavengers and biocides, when used, may not be 100% effective in controlling the
formation of H2S. Toxic vapour detection instruments complying with the
requirement in 13.2.1 of the Code for testing for H2S may be used to satisfy
this requirement.