US 8,393,724 B2  50  49  The addition amount of hydrochloric acid corresponds to  about 0.2 equivalents of imidazole in an acid equivalent.  The addition amount of hydrochloric acid corresponds to  about 0.2 equivalents of imidazole in an acid equivalent.  The addition amount of hydrochloric acid corresponds to  about 0.8 equivalents oftrishydroxymethylaminomethane in  an acid equivalent.  The addition amount of hydrochloric acid corresponds to  about 0.2 equivalents of imidazole in an acid equivalent.  The addition amount of hydrochloric acid corresponds to  about 0.2 equivalents of imidazole in an acid equivalent.  The addition amount of hydrochloric acid corresponds to  about 0.8 equivalents oftriethanol amine in an acid equiva› lent.  The addition amount  of  hydrochloric acid corresponds to  about 0.8 equivalents oftrishydroxymethylaminomethane in  an acid equivalent.  Maintenance Liquid for Comparison  DEGmBE  Irnidazole  Maintenance Liquid 6  25%  0.136%  0.32%  74.54%  lN  hydrochloric acid  Ion exchange water  (pH 7.49)  DEGmBE  Irnidazole  Maintenance Liqiuid 7  lN hydrochloric acid  Ion exchange water  (pH 7.49)  25%  0.102%  0.24%  74.66%  Maintenance Liquid 8  TEGmBE  Trishydroxymethylaminomethane  lN hydrochloric acid  Ion exchange water  (pH 7.38)  25%  0.12%  0.8%  74.08%  DEGmEE  Irnidazole  Maintenance Liquid 9  lN  hydrochloric acid  Ion exchange water  (pH 7.28)  25%  0.068%  0.16%  74.77%  TPGmME  Irnidazole  Maintenance Liquid 10  lN  hydrochloric acid  Ion exchange water  (pH 7.40)  25%  0.068%  0.16%  74.77%  Maintenance Liquid 11  TEG  Trishydroxymethylaminomethane  1  N  hydrochloric acid  Ion exchange water  (pH 7.35)  25%  0.12%  0.8%  74.08%  Maintenance Liquid 12  DEGmBE  Triethanol amine  1 N hydrochloric acid  Ion exchange water  (pH 7.23)  25%  0.3%  1.5%  73.85%  Maintenance Liquid  A  DEGmBE  Ion exchange water  (pH 4.83)  25%  75%  Maintenance Liquid B  DEGmBE  1  N  sodium hydroxide  Ion exchange water  (pH 10.22)  25%  0.006%  74.99%  Maintenance Liquid C  DEGmBE  Triethanol amine  Ion exchange water  (pH 8.44)  25%  0.3%  74.7%  Maintenance Liquid D  Triethylene glycol  Ethylene glycol  Ethanol  Ion exchange water  (pH6.31)  10%  25%  45%  20%  The addition amount of hydrochloric acid corresponds to 55  about 0.2 equivalents of imidazole in an acid equivalent. 