Table 2.
Phthalate metabolite characteristics and measurements.
| Phthalate | Abbreviation | Molecular weight (g/mol) | High/low MW | Parent compound | LOD (μg/L) | GM (μg/L) | GM (mol/L) | % above LOD |
|---|---|---|---|---|---|---|---|---|
| Mono(2-ethyl-5-carboxypentyl) phthalate | MECPP | 308.33 | High | Di(2-ethylhexyl) phthalate (DEHP) | 0.6 | 41.78 | 133.56 | 100 |
| Mono(2-ethyl-5-hydroxyhexyl) phthalate | MEHHP | 294.34 | High | DEHP | 0.7 | 29.87 | 99.73 | 98.87 |
| Mono(2-ethyl-5-oxohexyl) phthalate | MEOHP | 292.32 | High | DEHP | 0.7 | 18.39 | 61.54 | 97.74 |
| Mono(2-ethylhexyl) phthalate | MEHP | 278.34 | High | DEHP | 1.2 | 4.38 | 15.70 | 68.36 |
| Mono(3-carboxypropyl) phthalate | MCPP | 252.22 | High | Dioctyl phthalate (DOP) | 0.2 | 1.40 | 5.45 | 84.75 |
| Mono(2,6-dimethyl-6-carboxyhexyl) phthalate | MCOP | 322.35 | High | Diisononyl phthalate (DiNP) | 0.7 | 6.85 | 20.08 | 94.92 |
| Mono(2,7-dimethyl-7-carboxyheptyl) phthalate | MCNP | 336.38 | High | Diisodecyl phthalate (DiDP) | 0.6 | 2.01 | 5.82 | 80.23 |
| Monobenzyl phthalate | MBzP | 256.25 | High | Benzylbutyl phthalate (BzBP) | 0.3 | 5.34 | 20.14 | 97.18 |
| Mono-isobutyl phthalate | MiBP | 222.24 | Low | Diisobutyl phthalate (DiBP) | 0.6 | 5.74 | 24.84 | 94.92 |
| Mono-n-butyl phthalate | MnBP | 222.23 | Low | Dibutyl phthalate (DnBP) | 0.6 | 13.05 | 57.25 | 97.18 |
| Monoethyl phthalate | MEP | 194.18 | Low | Diethyl phthalate (DEP) | 0.8 | 85.00 | 432.68 | 100 |
| Abbreviations: GM, geometric mean; LOD, limit of detection; MW, molecular weight. Concentrations < LOD were assigned a value equal to one-half the LOD. Correction factors of 0.66 for MEP and 0.72 for MBzP were applied due to analytic standards of inadequate purity. Summed HMW phthalates include all phthalates listed as “high”; summed LMW phthalates include all phthalates listed as “low”; and summed DEHP metabolites include all phthalates with DEHP listed as the parent compound. | ||||||||