Table 1.

DA concentrations tabulated for the eluted samples from the SERS calibration curve.

S. No	Spiking Concentration (ppm)	Concentration (ppm) Tabulated from SERS	Tabulated Elution Efficiency (%)
1.	1000	998	~78–90%
2.	500	390
3.	100	80
4.	50	42
5.	25	27
6.	10	6.9
7.	1	0.92
8.	Control	<5 ppm