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Reagents | (nm) | Linear range (g mL−1) | (L mol−1 cm−1) | LOD (g mL−1) | Remarks | Ref. |
|
Phenol red Chlorophenol red | 393 405 | 8.72–104.64 3.27–49.05 | 4.212 × 103 9.624 × 103 | | Less sensitive, involves pH control, extraction step | [12] |
Iron(III)-potassium ferricyanide Iron(III)-o-phenanthroline Iron(III)-bipyridyl | 750 510 520 | 3.0–15 0.5–8.0 2.0–16 | 2.581 × 104 7.91 × 104 3.24 × 104 | 0.37 0.21 0.45 | Less sensitive, heating required. Multistep reaction | [14] |
Cobalt(II)-thiocyanate Molybdenum(V)-thiocyanate | 625 467 | 20–280 4.0–36 | 0.1973 × 104 1.42 × 104 | 0.68 0.26 | Less sensitive, involves pH control, extraction step | [15] |
Chromotrope 2B Chromotrope 2R | 528 526 | 4.36–52.32 4.36–39.24 | 1.023 × 104 0.9062 × 104 | 0.07 0.114 | Less sensitive, extraction step | [16] |
KMnO4-amaranth KMnO4-acid orange II KMnO4-indigo carmine KMnO4-methylene blue | 522 485 610 664 | 2.0–16 2.0–14 2.0–14 2.0–10 | 1.062 × 104 1.193 × 104 1.37 × 104 1.484 × 104 | 0.30 0.16 0.21 0.18 | Less sensitive | [17] |
Alizarin red sulphonate Ammonium metavanadate | 428 759 | 2.0–20 100–600 | 1.819 × 104 0.7076 × 103 | 0.21 21 | Less sensitive, involves pH control, extraction step Heating required | [18] |
Bromate-methyl orange Bromate-indigo carmine Bromate-thymol blue Bromate-1,10-phenanthroline Bromate-Fe(III)-thiocyanate | 520 610 550 510 480 | 0.5–3.0 0.5–5.0 1.0–8.0 0.5–4.0 0.5–3.5 | 1.1114 × 105 0.6242 × 105 0.3658 × 105 1.0152 × 105 1.2558 × 105 | 0.094 0.086 0.25 0.072 0.102 | Simple, highly sensitive, and no heating step. No use of organic solvent. Use of an eco-friendly brominating reagent. | Present work |
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