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

Table 5

Results of variance analysis.

Factor			FR	Significance
pH	101.40	2	107.42
IS	787.43	2	795.38
NOM	108.41	2	109.51
pH × IS	8.73	4	4.41
pH × NOM	3.73	4	1.88	—
IS × NOM	12.37	4	6.25
Error	5.94	12

is the sum of square of deviations, is the degree of freedom, and “×” represents the interactions between two factors.