Table 1.
Overview of precursor ion, product ions and limit of detection for not validated microcystin congeners. Additionally, the table also includes the detection frequency of the congeners in the analyzed samples at different total microcystin concentrations.
| Toxins | MC-HtyR | dm MC-LR/D-asp MC-LR | D-asp-Dhb MC-RR/dm MC-RR | MC-HilR |
|---|---|---|---|---|
| Precursor ion | 1059.5 | 981.14 | 512.7 | 505.3 |
| Product ions | 106.9; 135.27 |
106.8; 135.07 |
103.2; 135.13 |
126.99; 134.92 |
| Limit of Detection (µg L−1) | 0.1 | 0.1 | 0.1 | 0.1 |
| All samples | 13.92% | 53.16% | 77.22% | 34.18% |
| Samples < 1 µg L−1 total microcystin | 0.00% | 9.38% | 50.00% | 0.00% |
| Samples > 1 µg L−1 total microcystin | 23.40% | 82.98% | 95.74% | 57.45% |
| Samples < 24 µg L−1 total microcystin | 25.00% | 100.00% | 100.00% | 100.00% |