T1 Tributyltin Compounds - Environmental Health Criteria 116 A1 United Nations Environment Programme, A1 World Health Organization, A1 International Labour Organisation, K1 environmental health K1 chemical K1 aquatic ecology K1 terrestrial ecosystem K1 toxic substance SN 92 4 157116 0 YR 1990 FD 1990 LK https://wedocs.unep.org/handle/20.500.11822/29456 UL https://wedocs.unep.org/handle/20.500.11822/29456 NO Tributyltin (TBT) compounds are organic derivatives of tetravalent tin. They are characterized by the presence of covalent bonds between carbon atoms and a tin atom and have the general formula (n-C4H9)3Sn-X (where X isan anion). The purity of commercial tributyltin oxide (TBTO) is generally above 96%; the principal impurities are dibutyltin derivatives and, to a lesser extent, tetrabutyltin and other trialkyltin compounds. TBTO is a colourless liquid with a characteristic odour and a relative density of 1.17 to 1.18. DS UN Environment Document Repository RD Sep 23, 2026