test kit model hyp 1 available from hach company of loveland colo the results shown in table 1 correlate to the amount of peroxide present at the specific time interval expressed as ppm of hydrogen peroxide the results show that dmdmh provides superior peroxide stabilization compared to glutaraldehyde on a ppm product basis the dmdmh surpassed the performance of the glutaraldehyde see table 1 dmdmh surpasses the performance of glutaraldehyde when added at 38 lower concentrations when considered on a molar aldehyde basis it is demonstrated that dmdmh surpasses the performance of glutaraldehyde when added at a concentration 73 lower in aldehyde equivalents dmdmh hydrogen peroxide stabilization was demonstrated in a sample of white water obtained from a paperboard mill using recycled paper 50 mix 15 corrugated 15 news and 20 other as follows the white water sample was diluted with 10 parts of sterilized tap water for every part of white water into three separate pyrex u00ae beakers 100 ml of the diluted white water was added one beaker was retained as a control 250 and 500 ppm of an aqueous solution containing 40 by weight of dmdmh available as dantogard u00ae from lonza inc i e 100 ppm of dmdmh and 200 ppm of dmdmh were added to the remaining two beakers respectively the solutions were tested at 37 u00b0 c and a ph of 7 8 hydrogen peroxide was added to the white water in quantities sufficient to achieve a concentration of 300 ppm h 2 o 2 aliquots were taken at the indicated times and analyzed for residual peroxide with a thiosulfate titration kit hach test kit model hyp 1 the results are shown in table 2.