Determination of 4-AP in water samples (n = 3).

Sample		Added (μM)		Found (μM)		Recovery (%)		RSD (%)
Tap water	1	33	50	33.2	52.1	100.6	104.2	1.92	2.85
	2	33	50	33.9	51.4	102.7	102.8	1.86	2.62
Well water	1	33	50	32.5	48	98.4	98	2.93	1.94
	2	33	50	34.1	51.6	103.3	103.2	1.79	2.74