Table 4.
Maximum arsenic concentration in the water column, average (±1 standard deviation) arsenic concentration in the oxic portion of the water column (>1 O2 mg L−1), average phytoplankton arsenic, and average zooplankton arsenic in summer months (May–Oct) on all sampling dates (n=47).
| stratification | stratification | max [As] (µg L−1) |
oxic [As] (µg L−1) |
phytoplankton [As] (µg g−1) |
zooplanktona [As] (µg g−1) |
|---|---|---|---|---|---|
| strongly stratified | Angle Lake | 56.3 | 2.3 (±1.4) | 54 (±39) | 11 (±4) |
| weakly stratified | Lake Killarney | 52.7 | 17.3 (±6.1) | 366 (±270) | 32 (±22) |
| strongly stratified | North Lake | 11.2 | 1.3 (±0.7) | 18 (±18) | 5 (±1) |
| weakly stratified | Steel Lake | 7.7 | 3.2 (±1.7) | 61 (±52) | 16 (±22) |
a
zooplankton data set excludes one outlying data point that had poor reproducibility between duplicate samples and an average arsenic concentration more than twice as high as any other sample in the dataset; collected from Lake Killarney on September 1, 2015.