since h2s is both toxic and flammable, i usually address h2s limit (to human) dispersion extent, h2s flammable limit dispersion extent, and consequence if h2s is ignited. just do it like another vessel leak. insert material (h2s), and get the dispersion extent of h2s limit as well as flame radiation extent.
criteria for h2s limit and heat radiation (impact to human) refer to OGP Report No. 434-14.1 Vulnerability of Human (google it, it's free)
hope that helps.
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