Table B.4 The mass balance for pendimethalin (high concentration) sorption to pond sediment Time Water Sediment Test glass Centrifuge tubes Total Theoretical total Control hours dpm dpm dpm dpm dpm dpm dpm Balance theoretical Balance control 3 4056 147122 41 18 151237 194279 158467 80% 95% 3 3769 109759 24 11 113563 194279 158467 60% 72% 24 3393 140830 23 10 144255 194279 153598 76% 94% 24 3405 132904 8 3 136320 194279 153598 72% 89% 168 3099 119298 22 10 122430 194279 155309 65% 79% 168 3138 124296 16 7 127456 194279 155309 68% 82% 480 3155 138413 20 9 141597 194279 145631 75% 97% 480 3098 150081 8 3 153190 194279 145631 81% 105% Average 72% 89%