Up to 100 grams of liquid nerve agent were used in the attack on former Russian spy Sergei Skripal and his daughter Yulia, the head of the Organisation for the Prohibition of Chemical Weapons (OPCW) has said. . http://www.heraldscotland.com/news/16204467.Up_to_100g_of_nerve_agent_used_on_Skripals__says_chemical_weapons_watchdog_chief/?ref=rss