| Sl. No. | Reagent | Media | λmax nm | ε, L∙mol−1∙cm−1 | Linearity µg mL−1 | LOD µg∙mL−1 | Applications | Ref. Vol. page, year |
| 1 | 6-hdroxy-3-(2-oxoindolin-3-lideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one | Britton-Robinson (B-R) buffer (pH 4 - 6) | 505 | 4 × 104 | 0.3 - 3.0 | 0.026 | Dental unit wastewater, fertilizer samples | J. Hazardous Mat. 178, 287, 2010 |
| 2 | Anthrone phenylhydrazone | pH 7 | 367 | 1.267 × 104 | 0.815 - 8.146 | 0.0939 | spiked water samples | Analele Uni. Bucuresti 20 (1), 57, 2011 |
| 3 | 5-5(p-aminobenzylidene) -rhodanine | SPE, eluent-DMF | 540 | 1.16 × 105 | 0.01 - 3.0 | N.R. | Tobacco additives | J. Chinese Chem. Soc. 51, 297, 2004 |
| 4 | 2-(2-thiazolylazo)-p-cresol | Cetylpyridinium chloride, at pH 9.5 | 548 | 4.69 × 104 | 0.02 - 0.112 | 0.006 | Tap water, dental wastewater | Turk J Chem 36, 159, 2012 |
| 5 | Diacetyl monoxime isonicotinoyl hydrazone | acidic buffer pH 5.5 | 351 | 2.23 × 104 | 1.00 - 12.03 | N.R. | Synthetic samples of alloy | Int. J. Chem. 3(2), 227, 2011 |
| 6 | O-carboxyphenyl diazoamino p-azobenzene | alkaline medium | 540 | 2.22 × 105 | 0.08 - 0.8 | N.R. | Air, water, soil, fungicide samples | Talanta 57, 461, 2002 |
| 7 | Diphenylthiocarbazone (dithizone) | 50% aqueous 1,4-dioxane | 488 | 2.5 × 104 | 0.1 - 25 | 20 | Biological, soil, plant samples | Spectroscopy 17, 45, 2003 |
| 8 | 1,5-diphenylthiocarbazone | Sodium dodecyl sulphate | 490 | 5.02 × 104 | 0.5 - 10 | 1.0 | Biological, food, pharm. samples | Anal. Sci. 21, 507, 2005 |
| 9 | Isonitriso p-isopropyl Acetophenone Phenyl Hydrazone | Methyl isobutyl ketone | 395 | 2.678 × 10−3 | 1.0 - 20 | sewage wastespiked water | Int. J. Life Sci. Pharm. Res. 1(1), 75, 2011 | |
| 10 | Iodide and Rhodamine B | dichloromethane benzene | 565 | 17.68 × 104 | 0.25 - 2.7 | 0.10 | Sains Malaysiana 41(2), 213, 2012 | |
| 11 | *Cold vapor AAS | ultrasonic assisted extraction | 0.721 - 1.41 mg/kg | 0.133 | muscle tissues of marine fish | Pak. J. Anal. Environ. Chem. 11(2), 12, 2010 | ||
| 12 | *Flow injection-cold vapor-ICPOES | Cloud point extraction | 4 ng∙L−1 | tap water | Spectrochimica Acta Part B 57, 365, 2002 | |||
| 13 | *Electrothermal-atomic absorption spectrometry | Ultrasound separation, back-extraction- dithizone and cyclohexane | 0.27 µg∙L−1 | human urine | Talanta, 64, 217, 2004 | |||
| 14 | Hydentoin, 5-amino1, 3,4-thiadizole-2-thiol | sodium acetate-acetic acid buffer | 490 | 6.45 × 104 | 2.2 | Beef and sheep liver and kidney | Int J Curr Pharm Res, 3(2), 102, 2011 | |
| 15 | 2-mercaptobenzo thiazole | 0.001% CTAB at pH 10.0 | 1.0 × 10−7 - 1.0 × 10−5 M∙L−1 | 6.2 ng∙mL−1 | Waste water | Bull. Korean Chem. Soc. 25(12), 1877, 2004 | ||
| 16 | *Thio-Michler’s Ketone | cloud point extraction using the nonionic surfactant Triton X-114 | 570 | 5.0 - 80.0 ng∙mL−1 | 0.83 ng∙mL−1 | Tap, river, well, waste water | J. Hazardous Materials 165, 1200, 2009 | |
| 17 | Ion-associate of HgI42− and ferroin aqueous and n-heptane interface at pH 5 | CH2Cl2 | 6.53×106 | 8.0 × 10−9 - 1.6 × 10−7 M∙L−1 | 5.0 × 10−10 M | Environmental, waste water | Talanta 67, 555, 2005 | |
| 18 | 2,4-dihydroxy propio-phenone benzoic acid hydrazone | pH 3, ferrocyanide solution | 430 | N.R. | 0.108 - 0.977 | 0.041 | Environmental water | Chem. Sci. Journal CSJ-14, 1, 2010 |
| 19 | 4-hydroxy-3,5-dimethoxybenz-aldehyde-4-hydroxy benzoylhydrazone | Basic surfactant SDBS (5%) | 420 | 4.56 × 104 | 0.300 - 3.09 | N.R. | Environmental water, biological samples | Int. J. Green Chem. Bioprocess 1(1), 10, 2011 |
| 20 | Sodium diethyl-dithiocarbamate | CCl4 | 435 | 1.5 × 105 | 0.02- 15 | 0.29 | Biological, soil, water, vegetable and fish samples | P. M. |