Table 2.
Half-life of OP in aqueous solution
| OP | pH | t½, days | °C | Solvent | Reference | |
|---|---|---|---|---|---|---|
| Chlorpyrifos CAS 2921-88-2 |
 |
1 1.2 1.2 5.9 6.1 9.8 9.8 9.7 9.7 10.3 10.3 10.3 10.7 11 11 11.2 11.2 11.9 12.4 12.4 12.9 12.9 |
89.1 123.4 54.7 53.5 141.5 10.1 10.2 10.5 10 1.6 1.4 1.6 0.8 0.5 0.5 0.4 0.4 0.2 0.04 0.04 0.01 0.01 |
25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 |
Sterile water or carbonate buffer | (Macalady and Wolfe, 1983) |
| Chlorpyrifos | 5 7 9 |
73 72 16 |
25 25 25 |
Not specified | (Solomon et al., 2014 | |
| Chlorpyrifos | 4.5 5 6 7 8 |
77 77 49 29.4 18.9 |
25 25 25 25 25 |
Sterile 0.2 M phosphate | (Chapman and Cole, 1982) | |
| Chlorpyrifos | 4.7 6.9 8.1 |
63 35 23 |
25 25 25 |
0.02 M phosphate | (Meikle and Youngson, 1978) | |
| Chlorpyrifos | 6.9 7.3 |
51.8 76.6 |
22 22 |
Pond water | (Lu et al., 2006) | |
| Chlorpyrifos | 7.1 | 110 | 22 | water | (Mansour et al., 1999) | |
| Chlorpyrifos | 7.1 | 70 | 21 | Distilled water | (Sharom et al., 1980) | |
| Chlorpyrifos | 6.1 7.4 |
120 53 |
20 20 |
Phosphate buffer | (Freed et al., 1979) | |
| Chlorpyrifos | 5.7 7.66 7.93 7.99 8.15 |
45.9 56 126 26 24 |
Deionized water River water |
(Liu et al., 2001) | ||
| Chlorpyrifos | 6 8.5 8.7 6 8.5 8.7 |
16.8 2.5 9.7 1 0.1 0.2 |
28 28 28 28 28 28 |
Tap water River water Brackish water Aerated tap Aerated river Aerated brackish |
(Thomas and Mansingh, 2002) | |
| Chlorpyrifos | 8 | 62 | 29 | Sterile 0.02 M phosphate | (Noblet et al., 1996) | |
| Chlorpyrifos oxon CAS 5598-15-2 |
 |
8 9 |
20.9 6.7 |
23 23 |
20 mM TrisCl, 0.01% NaN | Present report |
| Chlorpyrifos oxon | 11.8 | 0.01 | 23 | 10 mM NaOH for pH 11.8 | Present work | |
| Diazinon CAS 333-41-5 |
 |
3.1 5.0 7.4 9.0 10.4 |
0.5 31 185 136 6 |
20 20 20 20 20 |
0.02 M phosphate | (Gomaa et al., 1969) |
| Diazinon | 5 7 9 |
12 138 77 |
Not specified | (EPA, 2006) | ||
| Diazinon | 7.3 | 171 | 21 | Not specified | (Mansour et al., 1999) | |
| Diazinon | 7.1 | 70 | 21 | Distilled water | (Sharom et al., 1980) | |
| Diazinon | 6.1 7.3 |
69 52 |
22 22 |
MilliQ water filtered river water | (Lartiges and Garrigues, 1995) | |
| Diazinon | 6.9 7.3 |
69.5 134.4 |
22 22 |
Pond water Pond water |
(Lu et al., 2006) | |
| Diazinon | 4.5 5 6 7 8 |
3.1 14 54.6 70 53.9 |
25 25 25 25 25 |
Sterile 0.2 M phosphate | (Chapman and Cole, 1982) | |
| Diazinon | 2.2 3.2 4.2 5.2 7.5 |
0.25 0.5 8 16.6 16.6 16.6 |
28 28 28 28 28 28 |
Mineral growth medium | (Drufovka et al., 2008) | |
| Diazinon | 8 | 130 | 29 | Sterile 0.02 M phosphate | (Noblet et al., 1996) | |
| Diazoxon CAS 962-58-3 |
 |
3.1 5.0 7.4 9.0 10.4 |
0.017 1.27 29 18 0.42 |
20 20 20 20 20 |
0.02 M phosphate | (Gomaa et al., 1969) |
| Diazoxon | 13 | 0.002 | 23 | 100 mM NaOH | Present report | |
| Dichlorvos CAS 62-73-7 |
 |
5 7 9 |
12 5 0.9 |
25 25 25 |
Buffered water | (Lim, 1996) |
| Dichlorvos | 2.6 5.6 7.0 9.0 |
>1.7 0.31 0.07 0.40 |
25 25 25 25 |
Water Cacodylate Cacodylate Tetraborate |
(Benoit-Marquié et al., 2004) | |
| Dichlorvos | 6.1 | <81 | 22 | Not specified | (Lartiges and Garrigues, 1995) | |
| Dichlorvos | 6 7 8.5 |
12.7 13.6 |
25 25 25 |
Well water near Ljubljana | (Druzina and Stegu, 2007) | |
| Dichlorvos | 4.0 6.9 9.3 11.5 |
30 4.5 0.9 0.03 |
25 25 25 25 |
Buffered water | (Grechko et al., 1983) | |
| Methamido phos CAS 10265-92-6 |
 |
7 9 |
5 2.9 |
22 22 |
Not specified | (Tomlin, 1997) |
| Monocrotop hos CAS 6923-22-4 |
 |
5 7 9 |
96 66 17 |
20 20 20 |
Not specified | (Tomlin, 1997) |
| Parathion ethyl CAS 56-38-2 |
 |
3.1 5 7.4 9 10.4 |
174 153 108 22 1.4 |
20 20 20 20 20 |
0.2 M phosphate | (Gomaa and Faust, 1972) |
| Parathion ethyl | 6.1 7.4 |
170 130 |
20 20 |
Phosphate buffer | (Freed et al., 1979) | |
| Parathion ethyl | 7.2 | 60 | 20 | Not specified | (Mansour et al., 1999) | |
| Parathion ethyl | 4 7 9 |
272 260 130 |
22 22 22 |
Not specified | (Tomlin, 1997) | |
| Parathion ethyl | 6.1 7.3 |
84 33 |
22 22 |
Milli-Q water Filtered river water |
(Lartiges and Garrigues, 1995) | |
| Parathion ethyl | 4.5 5 6 7 8 |
273 301 231 168 105 |
25 25 25 25 25 |
Sterile 0.2 M phosphate | (Chapman and Cole, 1982) | |
| Parathion ethyl | 7 | 120 | 25 | Not specified | (Coates, 1949) | |
| Parathion ethyl | 6 7 8.5 |
23.9 33.5 31.4 |
25 25 25 |
Well water near Ljubljana | (Druzina and Stegu, 2007) | |
| Parathion-methyl CAS 298-00-0 |
 |
6 7 8.5 |
45.5 47.2 47.6 |
25 25 25 |
Well water near Ljubljana | (Druzina and Stegu, 2007) |
| Paraoxon ethyl CAS 311-45-5 |
 |
3.1 5 7.4 9 10.4 |
197 173 144 2.9 0.25 |
20 20 20 20 20 |
0.2 M phosphate | (Gomaa and Faust, 1972) |
| Paraoxon ethyl | 7 | 87 | 25 | Not specified | (Coates, 1949) | |
| Paraoxon ethyl | 13 | 0.008 | 23 | 100 mM NaOH | Present report | |
| Paraoxon-methyl CAS 950-35-6 |
 |
13 | 0.002 | 23 | 100 mM NaOH | Present report |
| Sarin CAS 107-44-8 |
 |
2.0 4.0 6.5 7.0 7.5 8.0 9.0 |
0.1 19.2 19.2 6.1 1.9 0.6 0.06 |
20 20 20 20 20 20 20 |
Buffered water | (Epstein, 1974) |
| Soman CAS 96-64-0 |
 |
2 3 4 5 6 7 7.6 9 10 |
0.1 1 6 6 6 3.3 0.28 0.02 0.02 |
20 20 20 20 20 20 20 20 20 |
Buffered water | (Clark, 1989) |
| Soman | 4.5 4.5 4.5 |
18.5 15.9 2.6 |
25 25 25 |
Dilute acid Water Acetate |
(Ellin et al., 1981) | |
| Soman | 6.4 8.0 8.6 |
6-14 0.3 0.1 0.1 |
27 27 27 27 |
0.15 M NaCl 0.02 M phosphate 0.02 M phosphate 0.02 M phosphate |
(Broomfield et al., 1986) | |
| Tabun CAS 77-81-6 |
 |
7 | 0.35 | 20 | water | (Clark, 1989) |
| VX CAS 50782-69-9 |
 |
7 | 16-42 | 25 | Not specified | (National.Research.Council.US, 1999) |