Solution number pH Components of solution 1 <28 a)   1% Succ b)   3% Succ 2 <28 a)    1% Succ + 0.1% Cit b)    3% Succ + 0.3% Cit 3 <2.8 a) 1% Succ + 0.1% Ac 4 <28 a)      1% Succ + 0.1% Cit ÷ 0.1% Ac b)      3% Succ + 0.3% Cit + 0.3% Ac 5 >10 a)    1% Na2Succ b)    3% Na2Succ 6 >10 a)      1% Na2Succ + 0.1% Na3Cit b)      3% Na2Succ + 0.3% Na3Cit 7 >10 a) 1% Na2Succ + 0.1% NaAc 8 > 10 a)          1% Na2Succ + 0.1% Na3Cit + 0.1% NaAc b)         3% Na2Succ + 0.3% Na3Cit + 0.3% NaAc

Table 2: Characterization of the solutions used for the NF tests [1].