Table 3.
Properties of principal CWA degradation products (commercial compounds are provided for comparison).
| Degradation producta | Acute toxicity | Toxicity | Vapor pressured | Water solubilitya | ||
| (formula; CAS number) | Parent CWA | Persistenceb | (oral LD50) (mg/kg) | ratingc | (mm Hg) | (mg/L) |
| MPA (solid) (CH5O3P; | GB, GD, GF, VX | High | 5000 (rat) | Slightly toxic (#2) | 2 × 10−6 | > 1.0 × 106 |
| 993-13-5) | hydrolysis | >5000 (mouse)a | ||||
| EMPA (liquid) | VX hydrolysis | Moderate | Considered similar to | Slightly toxic (#2) | 3.6 × 10−4 | 1.8 × 105 |
| (C3H9PO3; 1832-53-7) | IMPAa | |||||
| EA 2192 (solid) | VX hydrolysis | Moderate | 0.630 (rat)a | Supertoxic (#6) | Not detectable; | Infinitely soluble |
| (C9H22NPO2S; | (pH 7-10) | 5.1 × 10−6 | ||||
| 73207-98-4) | (est.) | |||||
| IMPA (liquid) | GB hydrolysis | High | 6070-7650 (rat) | Slightly toxic (#2) | 1.2 × 10−2 (est.) | 5.0 × 104 |
| (C4H11PO3; | 5620-6550 (mouse)a | |||||
| 1832-54-8) | ||||||
| Thiodiglycol (liquid) | HD hydrolysis | Moderate | 6610 (rat)a | Slightly toxic (#2) | 2 × 10−5 | Miscible |
| (C4H10O2S; 111-48-8) | ||||||
| Aspirin (50-78-2) | Not applicable | — | 50-500e | Very toxic (#4)e | 2.5 × 10−5 (calc.) | 4.6 × 103 |
| Table salt (NaCl; | Not applicable | — | 3750 (rat)e | Moderately toxic | 1.0 at 865°C | 3.6 × 105 |
| 7647-14-5) | (#3)e | |||||
| Saccharin (soluble) | Not applicable | — | 5000-15000e | Slightly toxic | Sublimes in | 4.3 × 103 |
| (128-44-9) | (#2)e | vacuum |
aDegradation products selected on the basis of environmental persistence, toxicity, or both from Talmage et al. (2007a, Table 1, Ch. 4); Munro et al. (1999); Reddy et al. (2005); Capacio et al. (2008, Table 19.2, Ch. 19);
bPersistence ranking based on chemical/physical properties and degradation data/estimates; mod = weeks to months, high = months to years (Talmage et al. 2007a).
cKlaassen et al. (1986, Table 2-2, p. 13);
dMunro et al. (1999); Howard and Meylan (1997); Michel et al. (1962); Rosenblatt et al. (1995); Hazardous Substances Data Bank, U.S. National Library of Medicine, Bethesda, available at www.toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?index.html;