0 ▁M t ▁of ▁sul fur ▁dio x ide . ▁However , ▁Horn ▁and ▁Sch imin cke ▁calculated ▁that ▁only ▁ 2 0 % ▁of ▁the ▁sul fur ▁in ▁the ▁mag ma ▁had ▁been ▁deg ass ed , ▁because ▁ 8 0 % ▁of ▁all ▁anal ys es ▁of ▁inclus ions ▁and ▁matrix ▁fall ▁below ▁the ▁detection ▁limit ▁of ▁an ▁ion ▁pro be . ▁The ▁results ▁of ▁average ▁contents ▁of ▁sul fur ▁in ▁ 1 9 ▁of ▁inclus ions ▁are ▁ 0 . 0 4 5 5 %, ▁Horn ▁assumed ▁the ▁contents ▁of ▁sul fur ▁in ▁matrix ▁glass ▁are ▁ 0 . 0 2 5 % ▁because ▁ 2 5 0 ▁p pm ▁is ▁detection ▁limit ▁of ▁the ▁ion ▁pro be . ▁They ▁concluded ▁that ▁the ▁total ▁sul fur ▁dio x ide ▁released ▁from ▁er u ption ▁was ▁only ▁ 4 ▁ ± ▁ 1 . 2 ▁M t , ▁but ▁Horn ▁suggests ▁that ▁may ▁be ▁excess ▁sul fur ▁accum ulated ▁in ▁the ▁v apor ▁phase . ▁Gu o ▁calculated ▁the ▁average ▁contents ▁of ▁sul fur ▁in ▁nine ▁glass ▁inclus ions ▁and ▁one ▁matrix ▁glass ▁are ▁ 0 . 0 3 % ▁and ▁ 0 . 0 1 7 %, ▁respectively . ▁The ▁results ▁of ▁Gu o ▁are ▁ 2 3 . 1 4 ▁M t ▁of ▁sul fur ▁dio x ide ▁released ▁from ▁er u ption , ▁and ▁ 3 . 3 3 ▁M t ▁of ▁sul fur ▁dio x ide ▁input ▁to ▁str atos phere . ▁The ▁sul fur ▁contents ▁in