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  • Monitoring the sonochemical degradation of phthalate esters in water using solid-phase microextraction.

Monitoring the sonochemical degradation of phthalate esters in water using solid-phase microextraction.

Chemosphere (2003-11-26)
Elefteria Psillakis, Dionissios Mantzavinos, Nicolas Kalogerakis
ABSTRACT

The sonochemical degradation of aqueous solutions containing low concentrations of six phthalate esters at an ultrasonic frequency of 80 kHz has been investigated. Ultrasonic treatment was found capable of removing the four higher molecular mass phthalates (di-n-butyl phthalate, butylbenzyl phthalate, di-(2-ethylhexyl) phthalate and di-n-octyl phthalate) within 30-60 min of irradiation. The rest (dimethyl phthalate and diethyl phthalate) were more recalcitrant and nearly complete removal could be achieved only after prolonged irradiation times. The relative reactivity of phthalates was explained in terms of their hydrophobicity. Experiments were carried out at an overall initial phthalate concentration of 240 microg l(-1), values of electric power of 75 and 150 W, temperatures of 21 and 50 degrees C and in the presence of NaCl to study the effect of various operating conditions on degradation. Solid-phase microextraction (SPME) coupled with GC-MS proved to be a powerful analytical tool to monitor the sonochemical degradation of phthalate esters at low microg l(-1) concentration levels, minimising the risk of secondary contamination during sample preparation, a major parameter to consider during phthalates analysis. The advantages as well as disadvantages of using SPME are also highlighted.

MATERIALS
Product Number
Brand
Product Description

Supelco
Thermogreen® LB-1 Septa, solid discs, diam. 11 mm ( 7/16 in.)
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 11 mm ( 7/16), pkg of 250 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 10 mm ( 13/32 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 10 mm ( 13/32), pkg of 1000 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 11 mm ( 7/16), pkg of 1000 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 10 mm ( 13/32 in.), pkg of 250 ea
Supelco
Thermogreen® LB-1 Septa, cylindrical,

septum type cylindrical with half-hole

, pkg of 100 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 17 mm ( 21/32 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 6 mm ( 1/4 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 9.5 mm ( 3/8 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 11 mm ( 7/16 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 12.5 mm ( 1/2 in.), pkg of 50 ea
Sigma-Aldrich
Thermogreen® LB-2 Septa, solid discs, diam. 5 mm ( 3/16 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 12.5 mm ( 1/2 in.), pkg of 250 ea
Supelco
Thermogreen® LB-1 Septa, solid discs, diam. 12.5 mm ( 1/2 in.)
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 16 mm ( 5/8 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, solid discs, diam. 9.5 mm ( 3/8 in.), pkg of 250 ea
Sigma-Aldrich
Thermogreen® LB-2 Septa, solid discs, diam. 11.5 mm ( 11/24 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, pre-drilled, diam. 11 mm ( 7/16 in.), pkg of 50 ea
Supelco
Thermogreen® LB-2 Septa, plug, Shimadzu plug, pkg of 50 ea
Supelco
Di-n-octyl phthalate, analytical standard
Supelco
Thermogreen® LB-2 Septa, pre-drilled, diam. 11 mm ( 7/16 in.), pkg of 25 ea
Supelco
Thermogreen® LB-2 Septa, plug, Shimadzu plug, pkg of 10 ea