Table 6. Effect of ZnO and CuO NPs on Accumulation of Metals in B. nigra Seeds^a.

treatment (mg/kg)		Zn	Cu	Ni	Mg	Co	Cd	Ca
ZnO NPs	control	2.3 ± 0.8d	0.29 ± 0.04a	ND	111.1 ± 2.9a	ND	ND	221.6 ± 6.2d
	Z200	10.7 ± 1.5c	0.28 ± 0.02a	ND	110.1 ± 3.4a	0.17 ± 0.02b	ND	262.3 ± 3.8b
	Z400	18.3 ± 1.1b	0.17 ± 0.02b	ND	107.1 ± 2.8b	0.2 ± 0.02a	ND	234.5 ± 5.1c
	Z600	21.4 ± 1.3a	0.21 ± 0.01c	ND	111.1 ± 3.1a	0.17 ± 0.01b	ND	273.9 ± 5.7a
CuO NPs	control	2.2 ± 0.1bc	0.3 ± 0.03d	ND	110.5 ± 2.5a	ND	ND	119.8 ± 4.2d
	C12.5	1.9 ± 0.2c	3.2 ± 0.7c	ND	110.1 ± 2.8a	0.02 ± 0.01b	ND	231.6 ± 5.6c
	C25	2.6 ± 0.2a	5.5 ± 0.6b	ND	112.1 ± 2.1a	0.02 ± 0.01b	0.06	278.6 ± 4.9a
	C50	2.2 ± 0.1b	6.8 ± 0.4a	ND	111.9 ± 3.0a	0.06 ± 0.02a	ND	256.6 ± 5.3b

^aThe results are presented as mean (n = 3). The similar letters within the column mean no statistical difference between treatments in Turkey’s test (p ≤ 0.05). (ND = not detected).