Table 2.

Detection results of six negative real samples with SH addition.

Samples	Theoretical/mg	Detection/mg	ω%/SERS	ϖ%/SERS
1	0.500	0.473	94.9	99.5
	0.500	0.548	109.6
	0.500	0.470	94.1
2	0.500	0.467	93.3	93.8
	0.500	0.489	97.9
	0.500	0.452	90.3
3	0.500	0.471	94.1	96.3
	0.500	0.468	93.5
	0.500	0.507	101.3
4	0.500	0.483	96.6	101.1
	0.500	0.483	96.7
	0.500	0.548	109.5
5	0.500	0.549	109.8	104.8
	0.500	0.507	101.3
	0.500	0.516	103.1
6	0.500	0.484	96.8	95.6
	0.500	0.486	97.1
	0.500	0.466	93.1