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Table 1. Biological and abiotic degradation times of selected organotins. <br />Degradation route, organism or Time for 50% degradation and <br />compartment, and tin compound other variables (reference) <br />BIOLOGICAL <br />Microorganisms <br />Tributyltin 1 to 2 weeks in aerated medium <br />in dark, 6 to 13 weeks in aerated <br />medium in light, >1 year in <br />anaerobic medium (Cardwell <br />and Sheldon 1986). <br />Triphenyltin 60 to 140 days under aerobic, <br />light conditions (Smith 1981b). <br />Algae, Ankistrodesmus falcatus <br />Tributyltin 25 days (Maguire et al. 1984). <br />Bivalve molluscs, 3 species <br />Tributyltin 10 to 14 days (Cardwell and Sheldon <br />1986; Laughlin et al. 1986a). <br />Sheepshead minnow, Cyurinodon <br />variegatus <br />Tributyltin 14 to 28 days (Cardwell and Sheldon <br />1986). <br />ABIOTIC <br />Distilled water <br />Tributyltin >89 days at initial concentration <br />of 0.7 mg Sn/1, 18 days at 2.0 <br />to 4.0 mg Sn/l (Walsh et al. <br />1986a). <br />Freshwater <br />Tributyltin 3 to 89 days (Duncan 1980; Smith <br />1981b; Ward et al. 1981; Maguire <br />and Tkacz 1985; Walsh et al. <br />1985). <br />6