Glyphosate persistence in seawater. - GreenMedInfo Summary
Glyphosate persistence in seawater.
Mar Pollut Bull. 2014 Jan 24. Epub 2014 Jan 24. PMID: 24467857
Glyphosate is one of the most widely applied herbicides globally but its persistence in seawater has not been reported. Here we quantify the biodegradation of glyphosate using standard"simulation"flask tests with native bacterial populations and coastal seawater from the Great Barrier Reef. The half-life for glyphosate at 25°C in low-light was 47days, extending to 267days in the dark at 25°C and 315days in the dark at 31°C, which is the longest persistence reported for this herbicide. AMPA, the microbial transformation product of glyphosate, was detected under all conditions, confirming that degradation was mediatedby the native microbial community. This study demonstrates glyphosate is moderately persistent in the marine water under low light conditions and is highly persistent in the dark. Little degradation would be expected during flood plumes in the tropics, which could potentially deliver dissolved andsediment-bound glyphosate far from shore.