Table 4.
Analytical characteristics of colorimetric sensors for mercury determination in water, published between 2007 and 2009.
| λab (nm) | Chromophore | Tested sample | LoD (μg/L) | RSD (%) | Ref. |
|---|---|---|---|---|---|
| 650 | 2-Mercapto-2-thiazoline and chromo-ionophore/PVC membrane | River waters | 0.01 | 0.76 | [71] |
| 580 | 4-Phenyl-2,6-bis(2,3,5,6-tetrahydrobenzo[b] [1,4,7]-trioxononin-9-yl)pyrylium perchlorate/PVC membrane, (turn-on) | Shaft & fountain waters | 0.02 | 0.04 | [72] |
| 663 | 2-Mercaptopyrimidine in PVC membrane (turn-off) | River waters | 0.08 | 0.42 | [73] |
| 405 | 3,30,5,50-Tetramethylbenzidine on DNA probe (turn off) | Spiked creek waters | 0.2 | nr | [74] |
| 520 | 4(2-Pyridylazo)resorcinol | Spiked water | 0.22 | 5 | [75] |
| 450 | Tetraphenylporphinetetrasulfonic acid on mesoporous monolith | Buffer pH 9 | 1.2 | 0.4 | [76] |
| 557 | Tetrapyridine on “dip-sticks (turn-off) | Standards | 5 | nr | [77] |
| 400/530 | Spiropyran probe (turn on). | Spiked tap water | 20 | nr | [78] |
| 429 | 4-Hydroxysalophen | Tap & river water | 26 | 1.8 | [79] |
| 665 | Hexathiacyclooctadecane | Tap & river water | 40 | 2.4 | [80] |
| 642 | Squaraine dye derivatives | Standards | 100 | nr | [81] |
| 560 | 1-[2-Pyridylazo]-2-naphthol in triacetyl cellulose | River & waste waters | 160 | 3.1 | [82] |
| 254 | Hydrophobic acid fraction in DOC used as proxy of dissolved Hg | River & lake water | 300 | [69] | |
| 520/300 | Naphthalimide derivative on gold nanoparticles | Standard | 500 | nr | [83] |
| 490 | Cyclotriveratrylene derivative | River water | 1,000 | 0.9 | [84] |
| 530 | Sensitised alumina cladding and PLS model | Standards | 1,000 | [85] | |
| 542 | Azo-coupled macrocyclic dye, on a silica nanotube | Standards | 20,000 | nr | [86] |
*
LoD: Limit of Detection; RSD: Relative Standard Deviation; nr: not reported.