. 2018 Feb 14;8(13):7243–7251. doi: 10.1039/c7ra11896a

The determination and recovery of Co(ii) in vitamin B₁₂ samples by the proposed method and FAAS (n = 3).

Sample	Spiked (mg g⁻¹)	VALS-DLLME			FAAS
Sample	Spiked (mg g⁻¹)	Found (mg g⁻¹)	Recovery (%)	RSD (%)	Found (mg g⁻¹)	Recovery (%)	RSD (%)
No. I (1 tablet = 0.1509 g)	0.000	0.729	—	—	0.762	—	—
	0.165	0.868	94.1	1.24	0.888	94.0	2.49
	0.331	1.054	99.6	2.43	1.067	101.8	1.57
	0.994	1.736	101.1	1.09	1.749	102.3	0.98
No. II (1 tablet = 0.1374 g)	0.000	0.699	—	—	0.706	—	—
	0.182	0.859	86.0	1.54	0.888	99.0	1.26
	0.364	1.077	102.7	0.98	1.084	103.0	2.37
	1.092	1.776	99.7	2.32	1.849	104.3	1.57
No. III (1 tablet = 0.1270 g)	0.000	0.701	—	—	0.702	—	—
	0.197	0.882	92.0	1.43	0.898	98.0	1.43
	0.394	1.087	99.5	1.57	1.118	104.5	1.89
	1.181	1.882	100.7	0.69	1.953	105.7	0.94
No. IV (1 tablet = 0.3056 g)	0.000	0.111	—	—	0.115	—	—
	0.081	0.187	92.0	2.12	0.193	93.1	2.31
	0.164	0.272	97.0	3.45	0.275	99.0	1.54
	0.491	0.605	100.7	1.34	0.612	101.0	0.92
No. V (1 tablet = 0.3924 g)	0.000	0.036	—	—	0.038	—	—
	0.064	0.097	96.0	1.57	0.092	84.0	1.27
	0.127	0.163	98.5	2.58	0.168	102.4	0.93
	0.382	0.415	99.3	2.63	0.426	101.3	1.38

The determination and recovery of Co(ii) in vitamin B12 samples by the proposed method and FAAS (n = 3).