This test paper allows the easy detection of arsine (AsH3) in the gas phase. Arsenic in solutions has to be converted into AsH3 with zinc / acid and purged from the solution. The arsine is detected directly at the boundary layer between water and air. Arsenic test paper is used for the easy determination of arsenic in grape must and wine. For the determination of arsine in compartment air the test paper is moistened with acetic anhydride. This test paper allows the easy detection of arsine (AsH3) in the gas phase. Arsenic in solutions has to be converted into AsH3 with zinc / acid and purged from the solution. The arsine is detected directly at the boundary layer between water and air. Arsenic test paper is used for the easy determination of arsenic in grape must and wine. For the determination of arsine in compartment air the test paper is moistened with acetic anhydride.