Overview
Ioxynil is a phenolic herbicide belonging to the benzonitrile class, first introduced in the 1960s. It functions as a photosynthesis inhibitor by blocking electron transport in photosystem II of target weeds. The compound is particularly effective against broadleaf weeds like chickweed, mayweed, and poppy in cereal crops. As a selective herbicide, ioxynil exhibits systemic action when absorbed through leaves, making it suitable for post-emergence applications. Its iodine-containing structure contributes to its mode of action and environmental persistence, typically providing residual control for 2-4 weeks after application.
Physical and Chemical Properties
Ioxynil appears as a white crystalline solid with limited water solubility but good solubility in organic solvents like acetone and ethanol. The compound is relatively stable under normal storage conditions but may decompose at temperatures above 212°C. Its vapor pressure is negligible, reducing volatility concerns during field applications. The presence of two iodine atoms and a nitrile group in its structure makes ioxynil chemically distinct from other herbicides. These functional groups contribute to both its herbicidal activity and environmental persistence, with a soil half-life ranging from 14 to 60 days depending on soil type and climatic conditions.
Main Applications
Ioxynil is primarily formulated as an emulsifiable concentrate (EC) or soluble concentrate (SL) for spray applications in cereal crops. It shows particular efficacy against problematic weeds in wheat and barley fields, often mixed with other herbicides like bromoxynil for broader spectrum control. In addition to cereal crops, some formulations are approved for use in turf management and non-crop areas. Application rates typically range from 0.25-0.75 kg active ingredient per hectare, with timing critical during the early growth stages of target weeds (2-4 leaf stage) for optimal results.
Safety and Storage
Ioxynil is classified as harmful (Xn) under EU classification and requires proper personal protective equipment including gloves, goggles, and respirators during handling. The compound shows moderate acute toxicity (LD50 oral rat: 110 mg/kg) and may cause eye and skin irritation. Storage should be in original containers at temperatures below 30°C, separated from food and feed. Spills should be contained with inert absorbent materials and disposed according to local regulations. Environmental precautions include preventing runoff into water bodies due to potential aquatic toxicity.
B2B Procurement Guide
When sourcing ioxynil, buyers should verify the technical material meets FAO or WHO specifications (typically 95-98% purity). Key procurement considerations include regulatory status in target countries, as approvals vary globally. The EU maintains approvals with restrictions, while some Asian markets allow broader use. Bulk buyers should request full analytical certificates (CoA) including impurity profiles and heavy metal content. Transportation requires hazardous goods documentation for sea freight. For formulation purposes, compatibility testing with other agrochemicals is recommended, especially when creating tank mixes or co-formulations.
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