Research Article
Extractive Spectrophotometric Method for Determination of Molybdenum in Steels and Environmental Samples
Table 2
Comparison of the proposed method with the existing methods of molybdenum determination.
| | Sr. no. | Aqueous conditions (initial) | (i) Solvent | (i) Molar absorptivity (L mol−1cm−1) | Beer’s law range (μg Mo mL−1) | Reference no. | | (ii) (nm) | (ii) Sandell’s sensitivity (μg Mo cm−2) |
| | (1) | Mo(VI), pH 1.5, 3–hydroxyflavone | (i) C6H6 | (i) 3.7 × 104 | 0.05–2.2 | [10] | | (ii) 400 | (ii) 0.0026 | | | (2) | Mo(VI), acetic acid, pH 4.2–2.9, 2-(2′-furyl)-3-hydroxy-4H-chromen-4-one | (i) CHCl3 | (i) 4.99 × 104 | 0–2.9 | [12] | | (ii) 414 | (ii) 0.0019 | | | (3) | Mo(VI), HCl, α-benzoinoxime, quercetin | (i) CHCl3 | (i) 3.6 × 104 | 0.6–1.8 | [14] | | (ii) 420 | (ii) 0.0027 | | | (4) | Mo(VI), pH 3–5, 3,4-dihydroxy-benzaldehyde thiosemicarbazone | (i) — | (i) 3.85 × 104 | 0.19–1.34 | [9] | | (ii) 365 | (ii) 0.0025 | | | (5) | Mo(V), SCN−, HCl, chloroquine and Mo(V), SCN−, HCl, pyrimethamine | (i) CH2Cl2 | (i) 6.16 × 103 and 5.8 × 103 | 2.0–2.2 | [19] | | (ii) 467 and 471 | (ii) 0.027 and 0.042 | 2.0–25 | | (6) | Mo(VI), 1 M H2SO4, Ascorbic acid, CHHB | (i) Toluene | (i) 5.26 × 104 | 0–2.31 | Proposed method | | (ii) 404 | (ii) 0.0016 | |
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