Table 2.

Cu ion concentration together with standard deviation (SD) and relative standard deviation (RSD) for the measurement made on each token. Note that ‘*’ denotes the thickness of the tokens.

Name	Cu Concentration (mg/L)	Standard Deviation (%)	RSD (%)
99.5% Cu-200um *	2.632	0.0922	3.5
99.5% Cu-200um *	2.902	0.0204	0.7
99.5% Cu-220um *	2.72	0.0006	0.02
TiCu-10-630um *	0.07	0.0012	1.69
TiCu-10-590um *	0.072	0.001	1.41
TiCu-10-525um *	0.063	0.0012	1.94