Table 2. Determination of Carbaryl Concentration in Vegetable Samples Using Three Types of SPCE-Modified AuNRs Using a Standard Addition Technique.

sample	electrode	amount added (μM)	amount found (μM)	recovery (%)	RSD (%)
cabbage	SPCE-A400	15	14.64	102.21 ± 2.72	3.44
		25	27.06	101.22 ± 3.20	3.63
		35	34.33	99.69 ± 2.86	2.72
	SPCE-A600	15	14.45	97.24 ± 3.19	3.29
		25	24.24	99.16 ± 3.25	3.63
		35	35.22	98.68 ± 2.91	3.52
	SPCE-A800	15	15.51	103.69 ± 3.89	2.05
		25	23.95	96.23 ± 1.29	4.50
		35	36.06	102.87 ± 4.27	1.95
cucumber	SPCE-A400	15	15.18	98.52 ± 3.42	4.28
		25	24.22	99.41 ± 3.65	2.25
		35	35.30	103.60 ± 3.67	2.72
	SPCE-A600	15	15.25	98.39 ± 3.29	1.00
		25	25.87	107.39 ± 3.49	1.69
		35	34.93	108.14 ± 3.62	3.12
	SPCE-A800	15	14.89	101.60 ± 4.38	2.32
		25	26.07	95.57 ± 3.26	2.51
		35	35.94	97.65 ± 4.31	3.55
Chinese cabbage	SPCE-A400	15	15.74	109.28 ± 3.69	2.62
		25	26.93	102.63 ± 5.25	3.95
		35	35.41	99.34 ± 3.75	3.71
	SPCE-A600	15	14.45	106.60 ± 3.69	4.54
		25	26.31	104.99 ± 3.50	2.20
		35	35.32	104.80 ± 4.68	1.44
	SPCE-A800	15	15.44	103.31 ± 4.17	1.33
		25	26.11	97.56 ± 4.13	1.47
		35	33.96	104.11 ± 5.12	2.01