According to a little googling [1] mustard gas breaks down in water (although slower in salt water) and doesn't bioconcentrate as well. 1: https://books.google

According to a little googling [1] mustard gas breaks down in water (although slower in salt water) and doesn't bioconcentrate as well. 1: https://books.google.com/books?id=G8O4KUEyIXAC&pg=PA35&lpg=PA35&dq=mustard+gas+salt+water&source=bl&ots=ctfNiPH8Zp&sig=MxBNyqhioW-ulmHaCZC9q-NsN98&hl=en&sa=X&ei=mP-_VPu1IILjsATW_IH4Dg&ved=0CF4Q6AEwCQ#v=onepage&q=mustard%20gas%20salt%20water&f=false https://books.google.com/books?id=G8O4KUEyIXAC&pg=PA35&lpg=P...