Table 7. Determination of CC, HQ, and RC Simultaneously in Real Water Samples at PdDAN/GCE.

			CC				HQ				RC
sample	added μM	found recovery μM	(%)	SD	RSD	found recovery μM	(%)	SD	RSD	found recovery μM	(%)	SD	RSD
river stream water	50	50	100	0.52	1.03	50	100	0.57	1.15	50.8	101.7	0.51	1.01
tap water	50	48.9	97.8	0.53	1.06	50	100	0.58	1.18	50	100	0.52	1.02
underground water	50	47.5	95	0.53	1.08	49	98	0.58	1.22	50	100	0.52	1.02