Overview
Fipronil is a phenylpyrazole insecticide developed by Rhône-Poulenc in the 1980s and commercialized in the 1990s. It operates by blocking GABA-gated chloride channels in the central nervous system of insects, leading to hyperexcitation and death. The compound exhibits high selectivity for insects over mammals due to differences in receptor sensitivity. Fipronil is classified as a WHO Class II moderately hazardous pesticide. Its systemic action makes it effective against a wide range of pests, including coleopteran, lepidopteran, and orthopteran species. The chemical's stability allows for prolonged residual activity in both soil and plant tissues.
Physical and Chemical Properties
As a white crystalline solid, fipronil demonstrates low volatility with a vapor pressure of 3.7×10−7 Pa at 25°C. Its octanol-water partition coefficient (log Kow) of 4.0 indicates moderate lipophilicity, contributing to its bioaccumulation potential in fatty tissues. The compound shows remarkable photostability with a half-life of 34 days in water under sunlight. In soil, aerobic conditions yield a half-life of 122–128 days, while anaerobic conditions accelerate degradation to 27–63 days. Hydrolysis is negligible across pH levels 5–9, ensuring stability in most environmental conditions.
Main Applications
In agriculture, fipronil is predominantly used as a seed treatment (e.g., for corn and sunflower) at 50–200 g active ingredient per 100 kg seeds. Soil applications target pests like wireworms and rootworms at rates of 50–150 g/ha. The chemical's systemic action protects plants for 3–4 weeks post-application. Urban pest control employs fipronil in bait formulations (0.01–0.05% concentration) for cockroach and ant management. Veterinary applications include topical flea treatments for pets (Frontline®) at 9.7–11.1% concentrations. Termiticide uses involve soil trenching at 0.06–0.12% solutions for long-term structural protection.
Safety and Storage
Fipronil requires careful handling due to its acute oral toxicity (LD50 = 97 mg/kg in rats). Always use nitrile gloves, chemical goggles, and NIOSH-approved respirators when handling concentrated formulations. Contaminated PPE should be disposed of as hazardous waste. Store in original containers at temperatures below 30°C, separated from foodstuffs and oxidizing agents. Secondary containment is recommended for bulk storage. Spills should be contained with inert absorbents and disposed of through licensed hazardous waste handlers. Never flush into waterways due to extreme toxicity to aquatic invertebrates (LC50 = 0.13 μg/L for Daphnia magna).
B2B Procurement Guide
When sourcing fipronil, prioritize suppliers with ISO 9001 certification and batch-specific Certificates of Analysis. Technical grade material should assay ≥95% purity by HPLC. For formulation buyers, verify the presence of appropriate stabilizers like BHT (butylated hydroxytoluene) in liquid concentrates. Monitor regulatory updates: The EU banned agricultural uses in 2017, while the US EPA maintains conditional registrations. Exporters should confirm destination country approvals—China's GB 2763-2021 sets a 0.02 mg/kg MRL for cereals. Consider alternatives like chlorantraniliprole for bee-sensitive applications. Bulk shipments (≥1 MT) typically offer 10–15% cost savings versus packaged quantities.
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