Here are some notes from two Technical Service Reports (124-475 & 138-378) written by Applied Biochemists the sellers of Cutrine and Cutrine Plus. In summary bound forms of copper from chelated algacides do end up in the algae, rooted plants, suspended organic materials and the sediments.
Report 138-378.
A test pond in WI, max depth 7ft, with filamentous algae Rhizoclonium was treated with 2.6 gal /ac of Cutrine Plus. Copper concentrations in the water at 3 locations after treatment were: Immediate after treatment 0.24-1.58ppm, 24 hrs 0.21-0.28, 48hrs 0.20-0.23, 72 hrs 0.19-0.20, 8 days 0.07ppm, 12 days 0.01ppm. Tests showed Cu maintained a presence for 12 days after treatment. Sources of Cu uptake of Cutrine Plus include being tied up with suspended organic materials, higher vascular plants, and bottom sediments.
Report 123-475.
Copper loss from the water column with Cutrine and Cutrine Plus was studied over 3 different sediment types 1. Heavy silty clay loam, 2. Mucky peat, 3. Dark brown loam. Initial doses of copper from Cutrine were 5 and 10ppm. Rapid copper losses occurred over all soil types within 4 hrs of application. Concentrations after the 2nd day were about 10 times les than the initial application concentration. Concentrations of Cu in the deionized water of the control without any sediment remained high and near the applied dosage for entire 22 days of the study period. Quickest Cu loss was in water over highly organic soils. Slightly lower rates of Cu loss occurred with Curine-Plus vs Cutrine but the difference was not significant. In general, rates and amount of Cu uptake increased with higher organic and clay fractions in the sediment.
Last edited by Bill Cody; 03/11/13 08:04 PM.
