TABLE 3.

Detection of methamphetamine in dust using an SPR sensor chip.

No.	Theoretical concentration (g/ml)	Initial detection value (g/ml)	Addition amount (g/ml)	Detection data after adding (g/ml)	Recovery rate/%
1	1.6 × 10−10	2.17 × 10−10	3.98 × 10−10	6.22 × 10−10	101.7
2	1.6 × 10−11	2.32 × 10−11	4.53 × 10−11	6.73 × 10−11	97.3
3	1.6 × 10−12	2.04 × 10−12	4.12 × 10−12	6.14 × 10−12	99.6