percent by volume of the liquid present of acetonitrile with the balance of the liquid being present being water and with the liquid of the composition being in contact with more than 0 001 preferably more than about 0 01 milliequivalents of an acid ion exchange resin per milliter of total solution this invention will be further described by the following illustrative embodiments which are provided for illustration and are not to be construed as limiting the invention into a 50 ml flask was placed 10 ml of 20 hydrogen peroxide and 1 ml of a solution made from 0 15g feso 4 in 100 ml water ferric sulfate titration indicated that just after the addition of the iron solution 17 27 h 2 o 2 was present after 10 minutes at room temperature 15 22 h 2 o 2 was present 88 1 of original amount after 60 minutes at room temperature 4 98 h 2 o 2 was found 28 8 of original amount the above procedure was repeated except that 0 1g of rohm and haas xn1010 h ion exchange resin macroreticular sulfonated styrene divinyl benzene hydrogen form was added initial h 2 o 2 titration indicated 15 50 was present and after 60 minutes 14 50 was present 93 5 of original amount.