. 2019 Mar 29;5(3):e01416. doi: 10.1016/j.heliyon.2019.e01416

Table 8.

Concentration of NH₄⁺ (mg/kg) liberated with time (hours) at different copolymer contents.

Sample code	6 h	20 h	40 h	60 h	80 h	100 h	168 h	216 h	288 h
AM	0.5 (0.1)	1.1 (0.1)	1.5 (0.3)	1.9 (0.2)	20.9 (2.0)	54.8 (1.9)	95.8 (3.3)	112.2 (4.2)	93.9 (3.0)
P1	6.7 (1.6)^a	11.1 (0.2)^a	19.4 (1.4)^a	17.4 (1.0)^a	20.9 (1.9)^a	34.6 (1.6)^a	21.7 (2.4)^a	21.1 (1.2)^a	22.7 (0.6)^a
P2	10.6 (2.3)^ab	14.7 (1.5)^ab	31.6 (2.4)^b	26.4 (1.8)^b	37.8 (0.4)^c	50.4 (2.2)^c	33.8 (2.9)^a	33.8 (1.7)^b	34.3 (3.1)^b
P3	11.7 (2.5)^b	22.2 (2.8)^cd	41.6 (1.7)^c	56.0 (0.9)^d	62.8 (1.4)^e	66.9 (0.5)^d	63.3 (1.6)^bc	67.2 (7.4)^d	64.1 (1.0)^de
P4	12.3 (1.6)^b	28.3 (1.7)^d	56.9 (1.5)^cd	61.9 (2.6)^e	64.3 (0.8)^e	80.3 (1.9)^e	80.3 (3.2)^d	64.3 (0.6)^d	52.3 (2.1)^c
CP1	12.8 (1.7)^b	13.3 (0.5)^ab	30.6 (2.4)^b	24.1 (1.5)^b	34.3 (1.5)^b	42.0 (3.7)^b	27.7 (3.8)^a	28.3 (1.0)^ab	32.3 (3.2)^b
CP2	13.9 (1.2)^b	19.2 (1.0)^bc	41.8 (1.6)^c	38.9 (1.8)^c	47.0 (1.0)^d	60.7 (1.8)^d	53.3 (2.0)^b	49.8 (2.6)^c	56.3 (3.2)^cd
CP3	13.5 (1.9)^b	21.1 (2.4)^c	56.1 (2.1)^d	51.8 (2.0)^d	64.6 (0.5)^e	81.1 (2.5)^e	57.4 (10.3)^bc	58.2 (0.8)^cd	61.7 (3.8)^de
CP4	14.1 (1.9)^b	20.7 (3.3)^c	52.5 (2.0)^d	53.9 (0.8)^d	63.3 (1.6)^e	81.7 (2.5)^e	68.0 (3.7)^cd	66.6 (4.6)^d	65.6 (3.4)^e

Notes: The values in parentheses are standard deviations (n = 3), different letters in the same column are significantly different (Tukey test; P ≤ 0.05 level).

Key: AM = Acrylamide monomer, 10 mM {0.07 % (w/v)}, P = PAM-co-AA; P1 = 0.02, P2 = 0.04, P3 = 0.05 & P4 = 0.06 (%w/v), CP = Cellulose-g-PAM-co-AA; CP1 = 0.02, CP2 = 0.04, CP3 = 0.05 & CP4 = 0.06 % (w/v).