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2299859 
Technical Report 
Antifouling Paints Based on Organotin Compounds. Part I. Colorimetric Determination of Microgram Amounts of Organotin Compounds in Aqueous Solutions 
Chromy, L; Uhacz, K 
1968 
NIOSH/00129716 
51 
494-498 
A method for the direct quantitative determination of organotin compounds in aqueous solutions was developed. The compounds tested by this method were bis-(tri-n-butyltin)oxide (56359) (TBTO) and tri-n-butyltin-acetate (56360) (TBTA). Fifty milliliters (ml) of aqueous organotin solution was tracted twice with 5ml of carbon-tetrachloride (CCl4). The extracts were combined and were added drop by drop to 5ml of dithizone solution at a concentration of 0.02 milligrams per ml until a slight change of green color was noted. The sample was diluted to 10ml with CCl4 and the absorption of the sample was determined colorimetrically at a wavelength of 570 nanometers using a Number 7 filter. This method was able to determine 0.01mg of TBTA and TBTO. In a test solution of 1 part per million (ppm) TBTO, this method detected 0.93ppm. A 1ppm test solution of TBTA gave results of 0.95ppm detected. Concentrations of 50 and 200ppm TBTA were also satisfactorily determined; however, at 50 and 200ppm TBTO, a dispersion formed and the determination was not possible. The authors conclude that this method can be used to follow the leaching of organotin compounds from antifouling paint films.