Description
The sonochemical decomposition of alachlor in a batch reactor was investigated.Alachlor was irradiated with ultrasound at an input power of 128 Watts with oxygen or ozone (1mg-L<sup>-1</sup> in solution) as a sparge gas. The frequency of ultrasonic irradiation was varied between205, 358, 618, and 1071 kHz. A frequency of 358 kHz gave the highest degradation rateconstant (0.098 ± 0.003 min<sup>-1</sup>) with oxygen as the sparge gas. Ozone alone decomposed alachloras quickly as sonication at 1071 kHz (k ozone = 0.045 ± 0.004 min<sup>-1</sup>). The fastest decompositionachieved was with the combination of ozone and sonication at either 358 or 618 kHz (average k= 0.229 ± 0.006 min<sup>-1</sup>). The addition of humic acids to the system slightly inhibited thedecomposition of alachlor. Several organic intermediates of alachlor sonolysis were identifiedby GC/MS, including 2,6-diethylaniline and 2-chloro-2′,6′-diethylacetanilide. Chlorine recoverywas approximately 70 % when sonication and ozonation were combined, indicating thatmineralization of the chlorinated portion of alachlor was faster than with either technology alone. Includes 35 references, table, figures.
Product Details
- Edition:
- Vol. – No.
- Published:
- 11/15/2004
- Number of Pages:
- 19
- File Size:
- 1 file
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
