Health & Environmental Research Online (HERO)

Print Feedback Export to File
Technical Report 
On The Degradation Of Organotin Compounds By Ultraviolet Rays 
Akagi, H; Sakagami, Y 
The effects of ultraviolet light (UV) on organic tin compounds used in agricultural fungicides and polyvinyl-chloride (9002862) (PVC) food containers were studied. Triphenyltin monochloride (639587) (TPTC), dioctyltin dichloride (3542367) (DOTC), and dibutyltin-dichloride (683181) (DBTC) were exposed to UV at a distance of 10 centimeters for up to 420 hours. At intervals, samples were analyzed by thin layer chromatography for degradation products. Hardened PVC film containing DBTC was similarly tested. During TPTC exposure to UV, degradation products appeared after 6 hours. Diphenyltin dichloride (1135995) and monophenyltin-trichloride (1124192) peaked at 45 and 135 hours, respectively. The former compound began to decline at 325 hours, as did TPTC, while the inorganic compound tin tetrachloride (7646788) (TC) increased with time. During UV exposure of the two dialkyltins, degradation products appeared after 6 hours. DOTC and DBTC were undetected after 370 and 135 hours, respectively, as were their monoalkyl derivatives, leaving only TC. Virtually all the tin compounds in PVC film decomposed into TC within 45 hours, while the film itself changed from transparent to greenish brown. The authors conclude that the organic tin compounds in PVC food containers undergo a similar decomposition and that the decomposition products migrate into the stored foodstuffs. (Japanese)