Dominating Role of Ionic Strength in the Sedimentation of Nano-TiO₂ in Aquatic Environments

Table 1

Factors and levels of the orthogonal experiment.

Factors	Levels
	1	2	3
pH	6.0	7.0	8.0
IS (mM)	0.5	2.5	25
NOM (mg L^−1)	0.5	1.0	5.0