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THESIS APPROVAL

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Probit Analysis of Autotomy<br />

Equation : Y = aX + b<br />

while; Y : Probit value at 50% autotomy = 5<br />

X : Log concentration<br />

a : slope<br />

b : intercept<br />

Appendix Table C11 Probit analysis of autotomy of L. hoffmeisteri exposed to<br />

naphthalene contaminated-sediment.<br />

Concentration Log Duration (h)<br />

(µg/g wwt) concentration 24 48 72 96<br />

% probit % probit % probit % probit<br />

6.25 0.796 0 0 0 0<br />

12.5 1.097 0 0 2 2.95 3.8 3.12<br />

25 1.398 0 4 3.25 7.8 3.52 12.8 3.82<br />

50 1.699 10 3.72 19.4 4.12 33.4 4.56 54.8 5.1<br />

100 2.000 32.2 4.53 62.4 5.31 97.4 6.88 99.8 7.88<br />

intercept -0.69 -1.49 -2.07 -2.96<br />

slope 2.61 3.38 4.24 5.15<br />

Calculation Log EC50 2.18 1.92 1.67 1.55<br />

EC50 151.35 83.17 46.77 35.48<br />

SD 0.573 1.031 1.660 2.013<br />

CI 0.789 1.166 1.627 1.969<br />

189

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