Sensitive and Simultaneous Determination of Hydroquinone and Catechol in Water Using an Anodized Glassy Carbon Electrode with Polymerized 2-(Phenylazo) Chromotropic Acid

Table 3

Estimation of HQ and CT in local tap water and lake water samples.

	Sample no.	HQ and CT added (μM)		HQ and CT found (μM)		Recovery (%)
		HQ	CT	HQ	CT	HQ	CT
Tap water	1	20	20	19.97	19.3	99.8	96.5
	2	40	40	40.12	41.7	100.3	104.2
	3	60	60	58.42	59.76	97.3	99.6
Lake water	1	20	20	19.89	19.91	99.4	99.5
	2	40	40	39.92	39.77	99.8	99.4
	3	60	60	59.8	58.13	99.6	96.8