Toxic Metal Recovery from Waste Printed Circuit Boards: A Review of Advanced Approaches for Sustainable Treatment Methodology

Table 1

Metal composition present in printed circuit boards reported in previous literature.

Metals elements in PCBs	Metals presents in PCBs according to previous reports (Wt %)
	[6] %	[7] %	[12] %	[13] %	[14] %	[15] %	[16] %	[17] %	[18] %
Pd				0.025	0.021	0.022		0.003
Pb	3	2		4.19	0.3	2.96	2.50	1.3
AI	7	2	4.7	4.78	1
Sn		4	1			5.62	4.79	3.8
Au	0.011	0.1	0.008	0.725	0.035	0.025	0.014	0.0068
Mg									0.12
Ni	2	2	1.5	0.95	0.1	1.65	0.41		0.61
Cr						0.356
Zn	0.4	1	0.45	2.17			0.18
Sb		4	0.06				0.05
Cd							0.1183
Cu	24	20	26.8	6.5	13	14.6	14.2	28.7	24.2
Ag	0.028		0.33	0.223	0.134	0.045		0.0079
Fe	12	8	5.3	0.11	5	4.79	3.08	0.6	0.18