Table 3.

Recovery study of Al³⁺ by Eu(III)-(3-NTA)₃ probe in water samples

Sample	[Al3+] (μM) added	[Al3+] (μM) found meana ± SD	Recovery rate (%)	RSD (% n = 3)
Mineral water	10	10.30 ± 0.1	103.0	5.23
	20	19.28 ± 0.3	96.25	2.60
	30	29.53 ± 0.2	98.42	3.74
Tap water	10	9.94 ± 0.08	99.44	6.45
	20	21.35 ± 0.3	106.75	5.69
	30	29.51 ± 0.5	98.37	4.56
Sea water 1	10	10.53 ± 0.4	105.30	2.14
	20	21.50 ± 0.2	107.50	7.56
	30	28.69 ± 0.6	95.65	6.23
Sea water 2	10	10.27 ± 0.1	102.70	4.25
	20	18.90 ± 0.7	94.50	6.26
	30	28.99 ± 0.3	96.63	7.89

SD Standard Deviation, RSD Relative Standard Deviation

^aMean for three determination