Table B.25 Variability in measured concentrations. Average relative standard deviations are given with maximum values in parenthesis. Substance Sediment Conc. n Between centrifuge tubes (test tubes) Cw n Between test tubes Cw n Between test tubes Cs Pendimethalin pond low 16 1.4% (2.6%) 8 1.3% (2.4%) 8 9.5% (32%) Pendimethalin pond high 16 1.3% (2.4%) 8 1.9% (5.2%) 8 8.3% (21%) Pendimethalin Lillebæk low 2 8.1% 2 7.1% Pendimethalin Lillebæk medium 2 3.1% 2 13% Pendimethalin Lillebæk high 8 6.1% (8.5%) 2 1.8% Pendimethalin Odderbæk low 4.7% 2 25% Pendimethalin Odderbæk medium 2 2.2% 5.3% Pendimethalin Odderbæk high 8 6.2% (12%) 2 52% Ioxynil Lillebæk low 2 4.5% 2 5.0% Ioxynil Lillebæk medium 8 5.5% (14%) 8 25%(75%) Ioxynil Lillebæk high 2 0.5% 2 34% Ioxynil Odderbæk low 2 0.4% 2 3.8% Ioxynil Odderbæk medium 8 3.0% (6.5%) 8 22% (29%) Ioxynil Odderbæk high 2 9.4% 2 14% Bentazone Lillebæk low 2 0.0% 2 13% Bentazone Lillebæk medium 2 0.7% 2 72.57% Bentazone Lillebæk high 2 1.2% 2 92.93% Bentazone Odderbæk low 2 0.5% 2 29.28% Bentazone Odderbæk medium 2 0.2% 2 26.81% Bentazone Odderbæk high 2 0.8% 2 22.73%