Open Access

Table 8

PPR changes over time. Sample S1 (HPAM/PEI gel system with 15 000 ppm HPAM and 8000 ppm PEI); Sample S3 (HPAM/PEI gel system with 7000 ppm HPAM and 4000 ppm PEI).

Time (days) PPR
S1 S3
1 94.82 99.24
7 75.45 97.42
30 97.29

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