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EC number: 201-557-4
CAS number: 84-74-2
Table 1 lists the indiviuals LC50 values and 95% confidence intervals
for the 44 chemicals tested in the contact tests, their slubility and
vapor pressure. Table 2 lists the combined values lists the combined
values for 6 groups of chemicals evaluated in the contact tests, in the
order of the most toxic group (phenols) to the least toxic group
Table 3 identifies the 10 most toxic and the 10 least toxic organic
chemicals as determined by the contact tests. The 10 least toxic
chemicals included five phthalates.
The phthalates, the least toxic chemical group tested, are very low in
solubility and vapor pressure. A brief comparison of the tested
chemicals suggests that compounds, that have the least toxicity to
earthworms, are those that are not very soluble in water or have a high
The lower the molecular weight of the phthalate compound, the greater
toxicity in the contact tests (Table 1). Toxicity could be related to
solubility, since the more soluble phthalates were the more toxic
In the artificial soil tests the phthalates were one of the least toxic
Two test methods, the 2d contact test and the 14d artificial soil test,
were used to evaluate the impact of six major classes of organic
chemicals on the earthworm (eisenia fetida). Of the organic chemicals
tested phenols and amines were the most toxic to the worm, followed in
descending order of toxicity by the substituted aromatics, halogenated
aluphaties, polycyclic aromatic hydrocarbons and phthalates.
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