A WATER QUALITY ISSUES ANALYSIS FOR THE JOHNSTONE RIVER BASIN
Report No. 11/05
for Terrain NRM
Stephen Lewis and Jon Brodie
Australian Centre for Tropical Freshwater Research, James Cook University
Final report April 2011
… Diuron, atrazine, hexazinone and tebuthiuron residues were detected in ‘grab’ samples collected along a transect from the Johnstone River to Russell Island (Kapernick et al., 2006). While herbicide residues detected were at relatively low levels (~5 ng/L diuron; others at 1-2 ng/L) compared to guidelines and effect concentrations, this sampling was conducted 2 weeks after Tropical Cyclone Larry had crossed the coast and so concentrations may have been much higher in the earlier stages of the plume.