Antimony compounds

Antimony has been used since antiquity — ancient Egyptians used antimony sulfide (stibnite) as a black eye cosmetic (kohl), and tartar emetic was used as an emetic and antiparasitic for centuries [1]. Modern antimony production (primarily from China, which supplies ~80% of world production) supports its largest use as antimony trioxide (Sb₂O₃) — a synergistic flame retardant that dramatically enhances the fire-retardant effect of halogenated compounds in plastics, textiles, and circuit boards [2]. Global production of antimony compounds exceeds 130,000 tonnes annually, mainly as Sb₂O₃ for flame retardant use in children's sleepwear, car seat foam, electronics, and upholstery [1]. Secondary uses include antimony-lead alloys in batteries, antimony sulfide in ammunition primers, and antimonials as antiparasitic drugs (meglumine antimoniate, sodium stibogluconate for leishmaniasis treatment in the developing world) [2].

Occupational inhalation of antimony trioxide dust occurs in flame retardant compounding, antimony smelting, and antimony oxide production [1]. Workers in lead-acid battery manufacturing using antimony-lead alloys face inhalation and ingestion exposure [2]. Flame-retardant treated consumer products (children's sleepwear, foam furniture, circuit boards) release trace antimony by migration, but consumer exposure from intact products is generally low [1]. Antimony leaches from PET plastic bottles into beverages, particularly under heat — studies have found antimony above WHO guidelines in some bottled water stored at elevated temperatures [2]. Communities near antimony mining or smelting operations face air and water contamination pathways [1].

Antimony inhibits a range of thiol-containing enzymes by binding sulfhydryl groups — similar to its arsenic neighbor in the periodic table [1]. It causes liver toxicity, cardiac dysrhythmias (particularly prolongation of the QT interval — a serious concern with antimonial drugs), and skin rashes [2]. Animal studies show lung tumors (adenocarcinomas) after inhalation exposure to antimony trioxide in rats; IARC classifies Sb₂O₃ as Group 2B (possible human carcinogen) [1]. Acute high-level exposure causes 'antimony spots' — small hemorrhagic skin papules in occupationally exposed workers. Gastrointestinal effects (nausea, vomiting) occur from significant ingestion exposure [2].

Antimony oxide compounding workers, smeltery workers, and lead-acid battery workers are the highest-risk occupational groups [1]. People drinking from PET bottles stored in hot cars or warehouses have higher dietary antimony from plastic migration [2]. Workers repairing or manufacturing circuit boards with antimony-flame-retardant components may have incidental exposure [1]. Patients receiving antimonial drug treatment for leishmaniasis face therapeutic doses with cardiac monitoring requirements [2].

1. Don't store bottled water in hot cars or direct sunlight — antimony leaching from PET bottles increases significantly with temperature [1]. 2. Occupational workers in antimony processing must use N95 or P100 respirators, as Sb₂O₃ dust is the primary inhalation hazard [2]. 3. For patients on antimonial drugs, cardiac monitoring (ECG) is required due to QT-prolongation risk [1]. 4. Wash hands before eating if working with antimony flame retardant compounds [2].