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. 2012 Aug 30;7(8):e44458. doi: 10.1371/journal.pone.0044458

Table 4. Hazardous concentration (HC5 and HC50) values extrapolated from SSD curves based on EC5 or EC50 of diatoms for 5 herbicides.

SSD-EC5 SSD-EC50
Herbicide HC5 (µg/l) HC50 (µg/l) HC5 (µg/l) HC50 (µg/l)
Diuron 0.09 24.83 1.43 188.21
Isoproturon 1.38 73.46 13.90 332.24
Atrazine 29.90 283.52 202.91 1020.88
Terbutryn 0.21 16.48 3.33 195.2
Metolachlor 14.93 787.69 1784.36 6312.69