pH

Buffer

THAM

MES

4.0

Appearance of TiO₂ film

Weight gain

0.3 mg

0.3 mg

6.0

Appearance of TiO₂ film

Weight gain

0.7 mg

0.4 mg

7.0

Appearance of TiO₂ film

Weight gain

0.7 mg

0.5 mg

8.5

Appearance of TiO₂ film

Weight gain

1.1 mg

0.7 mg