Overview
Thiazophos is an organophosphorus compound developed as a broad-spectrum insecticide and acaricide. Its systemic action makes it effective against sucking pests like aphids and mites in crops such as cotton, vegetables, and fruit trees. The bulk packaging form (typically 200L drums or IBC totes) caters to agricultural enterprises and formulators requiring large quantities for commercial pest control programs. First introduced in the 1970s, thiazophos remains relevant in integrated pest management (IPM) systems despite stricter regulations in some markets. Its mode of action involves acetylcholinesterase inhibition, disrupting nervous systems in target organisms. Bulk purchases require careful handling due to its toxicity profile.
Physical and Chemical Properties
As a phosphorothioate compound, thiazophos exhibits moderate persistence in soil (half-life 2-4 weeks) and plant tissues. The technical grade material is typically 90-98% pure with a characteristic pungent odor. Its vapor pressure is low (1.5×10⁻⁵ mmHg at 25°C), reducing volatility risks during storage. Chemically, it undergoes hydrolysis in alkaline conditions (pH>7), necessitating pH-controlled formulations. The compound shows stability in neutral and slightly acidic environments. Compatibility testing is essential when tank-mixing with other agrochemicals to avoid decomposition or precipitation.
Main Applications
Thiazophos is primarily applied as a foliar spray or soil treatment against pests in cotton (bollworms, whiteflies), vegetables (leaf miners, thrips), and deciduous fruits (mites, scales). Application rates typically range 300-600g active ingredient per hectare, with pre-harvest intervals (PHI) of 14-21 days depending on crop and regulation. In some regions, it's used in seed treatment formulations for early-season pest protection. Resistance management strategies recommend alternating with non-organophosphate insecticides to delay pest resistance development. Always follow local label instructions and maximum residue limits (MRLs).
Safety and Storage
As a WHO Class II (moderately hazardous) compound, thiazophos requires strict safety protocols. Storage areas must have secondary containment, fire suppression systems, and restricted access. Bulk containers should be inspected regularly for leaks and kept away from food/feed storage. Personnel handling bulk material need chemical-resistant gloves (nitrile or neoprene), goggles, respirators with organic vapor cartridges, and protective suits. Emergency equipment (eye wash stations, absorbents) must be accessible. First aid measures include atropine sulfate injection (antidote) for accidental poisoning cases.
B2B Procurement Guide
When sourcing bulk thiazophos, prioritize suppliers with ISO 9001 certification and REACH/EPA compliance documentation. Key procurement considerations include batch analysis certificates (purity, impurities), formulation compatibility data, and transport classifications (usually UN 3018, Packing Group II). Logistics planning should account for hazmat shipping requirements - bulk shipments typically move via chemical tankers or UN-certified IBCs. Incoterms clarification (especially for international trade) and liability insurance are critical. Some markets require import permits for organophosphates, so verify regulatory status beforehand.
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