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General, reproductive, developmental, and endocrine toxicity of boronated compounds
P A Fail1, R E Chapin, C J Price
1Center for Life Sciences and Toxicology, Research Triangle Institute, NC 27709-2194, USA.
Reproductive Toxicology (Elmsford, N.Y.)
|February 7, 1998
Summary
Boric acid and borates can cause reproductive and developmental toxicity in animal studies. However, human exposure from typical activities poses a remote risk of toxicity due to wide safety margins.
Area of Science:
- Toxicology
- Environmental Health
- Reproductive Science
Background:
- Boric acid and inorganic borates are widely utilized across industrial, agricultural, and cosmetic sectors.
- While toxic at high doses, these compounds are not carcinogenic or mutagenic.
- Reproductive and developmental effects are the primary toxicological concerns.
Purpose of the Study:
- To evaluate the reproductive and developmental toxicity of boric acid and inorganic borates.
- To assess potential endocrine-disrupting effects.
- To determine the risk to humans based on estimated exposure levels.
Main Methods:
- Animal studies were conducted to identify toxicological endpoints.
- Dose-response relationships for testicular effects and prenatal development were established.
- No Observed Adverse Effect Levels (NOAELs) were determined for rat fetal development.
Main Results:
- Testicular toxicity was observed at approximately 26 mg boron equivalents/kg body weight/day.
- Prenatal growth and morphologic development were most sensitive, with effects at 12.9 mg BE/kg bw/d.
- The NOAEL for rat fetal development was 9.6 mg/kg BE, and hormonal changes were noted but deemed secondary to testicular toxicity.
Conclusions:
- Borates are not considered endocrine disruptors.
- Estimated human exposure levels, considering safety factors, indicate a low risk of reproductive failure.
- The margin of exposure suggests human toxicity from boric acid and borates during normal activities is unlikely.