Separation/Preconcentration and Speciation Analysis of Trace Amounts of Arsenate and Arsenite in Water Samples Using Modified Magnetite Nanoparticles and Molybdenum Blue Method

Table 1

Application of the proposed method to the speciation of As in different water samples (sample volume: 50 mL, 𝑛=7). The results are mean of seven measurements ± standard deviation.

Sample	Added, As(III); (𝜇g mL^−1)	Added, As(V); (𝜇g mL^−1)	Found, As(III); (𝜇g mL^−1)	Found, As(V); (𝜇g mL^−1)	Found, total As; (𝜇g mL^−1)	Recovery (%)
						As(III)	As(V)	Total As
Tap water from Kerman city	—	—	—	—	—	—	—	—
	4.0	—	4.06±0.18	—	4.06±0.18	101.5±2.1	—	101.5±2.0
	—	4.0	—	4.15±0.22	4.15±0.22	—	103.7±2.0	103.7±2.7
	4.0	4.0	4.10±0.10	4.20±0.24	8.30±0.20	102.5±2.3	105.0±2.8	103.7±2.4
River water from Hajiabad river	—	—	—	0.25±0.02	0.25±0.02	—	—	—
	4.0	—	4.24±0.09	0.28±0.05	4.52±0.08	106.0±1.8	—	105.6±2.2
	—	4.0	—	4.30±0.18	4.30±0.18	—	101.2±2.0	101.2±2.0
	4.0	4.0	4.20±0.12	4.35±0.20	8.55±0.20	105.0±1.8	102.5±2.2	103.4±2.0
Spring water from Bandar Abbas city	—	—	0.36±0.03	0.61±0.03	0.97±0.03	—	—	—
	4.0	—	4.48±0.11	0.58±0.06	5.06±0.12	103.0±1.8	—	102.2±2.0
	—	4.0	0.34±0.03	4.66±0.20	5.00±0.15	—	100.2±2.0	100.6±2.2
	4.0	4.0	4.45±0.14	4.66±0.18	9.11±0.22	102.2±2.4	101.7±2.7	101.5±2.2