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 -