OH-radical reactivity and direct photolysis of triphenyltin hydroxide in aqueous solution
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In: Journal of Photochemistry and Photobiology, Vol. 156, No. 1-3, 20.03.2003, p. 105-114.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - OH-radical reactivity and direct photolysis of triphenyltin hydroxide in aqueous solution
AU - Palm, Wolf-Ulrich
AU - Kopetzky, Raimo
AU - Ruck, Wolfgang
PY - 2003/3/20
Y1 - 2003/3/20
N2 - Photolytic degradation reactions in aqueous solution of the fungicide triphenyltin hydroxide (TPT), a compound with typical physicochemical properties of a persistent organic pollutant (POP) were investigated. The quantum yield is found to be close to unity, Φ TPT,254 ±2σ=1.25±0.26 at 254 nm (T=295-298 K). Using nitrobenzene as reference compound the OH-rate constant of TPT was found to be k OH,TPT ±2σ=(9.4±3)×10 9 M -1 s -1 at T=295 K. Although the quantum yield of TPT is among the highest values found for a pesticide, the degradation by sunlight is negligible due to a lack of overlap with the UV-spectrum of TPT. Adopting OH-levels of c OH =2.5 × 10 -16 M the OH-rate constant of dissolved TPT leads to a lifetime of about 1 week in surface waters. However, the lifetime found is assumed to be a minimum value and the influence of the adsorption of TPT on particles on degradation reactions in the environment should be investigated.
AB - Photolytic degradation reactions in aqueous solution of the fungicide triphenyltin hydroxide (TPT), a compound with typical physicochemical properties of a persistent organic pollutant (POP) were investigated. The quantum yield is found to be close to unity, Φ TPT,254 ±2σ=1.25±0.26 at 254 nm (T=295-298 K). Using nitrobenzene as reference compound the OH-rate constant of TPT was found to be k OH,TPT ±2σ=(9.4±3)×10 9 M -1 s -1 at T=295 K. Although the quantum yield of TPT is among the highest values found for a pesticide, the degradation by sunlight is negligible due to a lack of overlap with the UV-spectrum of TPT. Adopting OH-levels of c OH =2.5 × 10 -16 M the OH-rate constant of dissolved TPT leads to a lifetime of about 1 week in surface waters. However, the lifetime found is assumed to be a minimum value and the influence of the adsorption of TPT on particles on degradation reactions in the environment should be investigated.
KW - Chemistry
KW - Triphenyltin hydroxide
KW - Fentin hydroxide
KW - Quantum yield
KW - OH-rate constant
KW - Biology
UR - http://www.scopus.com/inward/record.url?scp=0037456626&partnerID=8YFLogxK
U2 - 10.1016/S1010-6030(02)00426-4
DO - 10.1016/S1010-6030(02)00426-4
M3 - Journal articles
VL - 156
SP - 105
EP - 114
JO - Journal of Photochemistry and Photobiology
JF - Journal of Photochemistry and Photobiology
SN - 1010-6030
IS - 1-3
ER -