Argonauta n. 1-6 2010

Table 3: Toxicity (LC₅₀) of different solvent extracts of bark of Euphorbia hirta plant against freshwater vector snails Lymnaea acuminata and Indoplanorbis exustus at different time intervals.

Solvents	Exposure periods	Effective dose (LC₅₀, mg/L)	Limits (mg/L)		Slope value	‘g’ factor	‘t’ ratio	Hetero-geneity
Solvents	Exposure periods	Effective dose (LC₅₀, mg/L)	LCL	UCL	Slope value	‘g’ factor	‘t’ ratio	Hetero-geneity
*Lymnaea acuminata*
Chloroform	24h	55.14	47.13	75.33	3.47±0.71	0.16	4.90	0.19
Chloroform	96h	26.36	22.36	29.58	3.47±0.59	0.11	5.86	0.15
Carbon tetrachloride	24h	55.23	45.97	82.83	2.82±0.64	0.20	4.38	0.10
Carbon tetrachloride	96h	23.32	17.96	27.04	2.92±0.59	0.16	4.98	0.23
Diethyl ether	24h	57.09	46.96	89.61	2.75±0.65	0.21	4.26	0.09
Diethyl ether	96h	21.53	12.70	26.53	2.10±0.57	0.29	3.67	0.18
Ethyl alcohol	24h	59.86	47.55	91.03	2.37±0.62	0.27	3.80	0.14
Ethyl alcohol	96h	20.65	15.39	24.18	3.18±0.62	0.15	5.13	0.40
Acetone	24h	61.75	55.12	66.18	2.38±0.64	0.18	4.28	0.12
Acetone	96h	13.43	10.42	15.67	2.46±0.60	0.21	4.33	0.13
*Indoplanorbis exustus*
Chloroform	24h	53.87	44.46	84.03	2.55±0.62	0.23	4.12	0.13
Chloroform	96h	19.91	14.58	23.45	3.21±0.63	0.15	5.10	0.45
Carbon tetrachloride	24h	55.98	46.24	86.65	2.73±0.06	0.21	4.26	0.11
Carbon tetrachloride	96h	21.35	16.10	24.91	3.12±0.61	0.15	5.14	0.26
Diethyl ether	24h	56.68	48.02	79.51	3.39±0.70	0.17	4.83	0.17
Diethyl ether	96h	26.24	20.88	30.26	2.72±0.58	0.17	4.73	0.31
Ethyl alcohol	24h	57.74	49.52	78.43	3.94±0.79	0.15	5.01	0.27
Ethyl alcohol	96h	27.96	22.06	32.64	2.43±0.57	0.21	4.29	0.16
Acetone	24h	58.29	49.22	82.57	3.49±0.72	0.16	4.84	0.26
Acetone	96h	25.97	20.19	30.18	2.58±0.57	0.19	4.51	0.26

Details are as given in Table 2.