A novel thermal-assisted ultra-violet (UV) photocatalysis digestion method for the determination of total phosphorus (TP) in water sampleswas introduced in thiswork. The photocatalytic experiments for TP digestionwere conducted using a 365 nm wavelength UV light and TiO

2

particles as the photocatalyst. Sodium tripolyphosphate and sodium glycerophosphate were used as the typical components of TP and the digested samples were then determined by spectrophotometry after phosphomolybdenum blue reaction. The effects of operational parameters such as reaction time and temperature were studied for the digestion of TP and the kinetic analysis of two typical components was performed in this paper. The pseudo-first-order rate constants k of two phosphorus compounds at different temperatures were obtained and the Arrhenius equation was employed to explain the effect of temperature on rate constant k. Compared with the conventional thermal digestion method for TP detection

it was found that the temperature was decreased from 120 ℃ to 60 ℃ with same conversion rate and time in this thermal-assisted UV digestion method

which enabled the digestion process work at

normal pressure. Compared with the individual ultra-violet (UV) photocatalysis process

the digestion time was also decreased from several hours to half an hour using the thermal-assisted UV digestion method. This method will not lead to secondary pollution since no oxidant was needed in the thermal-assisted UV photocatalysis digestion process

which made it more compatible with electrochemical detection of TP.