... .0 Reducing substance (Fe2+), max 0.10 PH (1% aqueous solution) 1.0-2.0 Arsenic(As) ,%,max 0.0008 Ferric ... % min21.0-27.0Reducing substance (Fe2+) max0.10PH (1% aqueous solution) 1.0-2.0Arsenic(As) %max0.0008Plurnbous(Pb) %max0.0015insoluble ... ;4. Under the same concentration, the shade of the aqueous solution is lighter than Polymer Ferric Sulphate, and water cannot change ...