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diphenylarsinous chloride

Diphenylchloroarsine (DA) is an organoarsenic compound developed near the conclusion of World War I. The chemical warfare compound is solid when pure, and has been used as an aerosol dispersed by thermal grenades or smoke generators. Its effect are: severe irritation of the eyes, nose, and throat. If the agent is inhaled for 1-2 minutes, tightness of the chest and headache are experienced. The headache develops into general nausea, which can result in vomiting in approximately three minutes. Under concentrations expected to occur under combat conditions, fatalities are not expected; however, these compounds can be fatal at higher concentrations.
DA was used by German troops in 1917 and was considered a significant development because it penetrated the activated carbon gas mask filters deployed in World War I. Its irritant behavior was considered more important than its lethality. DA was used in combination with phosgene and diphosgene; DA caused victims to remove their masks to sneeze, cough, or vomit, rendering them vulnerable to the toxic effects of the other agents. DA alone saw some use as a riot-control agent up to the 1930s.
Names:  diphenylarsinous chloride, diphenylchloroarsine, Clark-1
Molecular formula:  C12H10AsCl
CAS Registry Number:  712-48-1


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