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Table 1 Mean lethal concentrations (50%) (LC 50 ) of chromium and zinc in newborn G. tigrina acute tests for sensitivity assessment

From: Effects of a textile azo dye on mortality, regeneration, and reproductive performance of the planarian, Girardia tigrina

  LC50(mg/L)
Test Cr6+ Zn2+
  24 h 48 h 72 h 96 h 24 h 48 h 72 h 96 h
I 13 11 8 7 2 2 2 2
II 11 11 11 7 1.6 1.6 1.6 1.6
III * 27 20 11 1.6 1.6 1.6 1.6
IV * 29 18 15 1.6 1.6 1.6 1.6
V 18 8 5 3 1.3 1.3 1.3 1.3
VI 15 10 5 4 1.6 1.6 1.6 1.6
VII 14 5 2 5 1.7 1.7 1.7 1.7
Mean 14.2 14.4 9.8 7 1.6 1.6 1.6 1.6
SDa 2.5 9.5 6.8 4.6 0.2 0.2 0.2 0.2
CV (%)b 18 66 69 66 12 12 12 12
  1. Asterisk indicates LC50, not calculable for the statistical method employed. aSD standard deviation of the mean. bCoefficient of variation. The tests indicated as I, II, III, IV, V, VI, and VII correspond to independent experiments.