Fig. 6

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Changes in the viscosity and absorbance of the HPAM/Al3+ systems with reaction time. (a) The system 1 under the salinity of 10 000 mg/L NaCl; (b) The system 2 under the salinity of 20 000 mg/L NaCl; (c) The system 3 under the salinity of 30 000 mg/L NaCl.