Quantitative Fractal Evaluation of Herbicide Effects on the Water-Absorbing Capacity of Superabsorbent Polymers

Table 5

Multifractal characteristic parameter Δ𝑎 of SAP hydrogel microtopography at different swelling times.

Swelling time/min	Atrazine mass concentration/mg·L^−1						Relative discrimination/%
	0			2
	𝑎(𝑞)max	𝑎(𝑞)min	Δ𝑎	𝑎(𝑞)max	𝑎(𝑞)min	Δ𝑎
10	2.491	1.898	0.593	2.254	1.800	0.454	23.44
40	2.616	1.980	0.636	2.306	1.814	0.492	22.64
70	2.671	1.982	0.689	2.470	1.932	0.538	21.92
100	2.775	2.052	0.723	2.582	2.001	0.581	19.64
150	2.834	2.066	0.768	2.646	2.004	0.642	16.54
Accumulated relative discrimination/%			25.02			33.04