Bioavailability of 2,4-D sorbed to a chlorite-like complex.
An Al(OH)x-montmorillonite (chlorite) complex (AM18) was prepared and 2,4-dichlorophenoxyacetic acid (2,4-D) sorbed to saturation. After several washing cycles the 'strongly sorbed' 2,4-D was 507 micrograms g-1 AM18. The bioavailability of sorbed 2,4-D was assessed in a minimal salts medium with the AM18-2,4-D as the sole C and energy source. Over a 28-day period a Pseudomonas sp. degraded 23% more of the sorbed 2,4-D than could be accounted for by desorption from AM18 in the non-inoculated controls. Possible explanations for the increase in bioavailability are presented.
McGhee
I
I
Research School of Biosciences, University of Kent, Canterbury, UK.
Sannino
F
F
Gianfreda
L
L
Burns
R G
RG
D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry / Q000378:metabolism*; D000327:Adsorption; D002712:Chlorides / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism
D002712:Chlorides; D006540:Herbicides; D015084:2,4-Dichlorophenoxyacetic Acid; C001599:chlorite