Study of the Effect of Mercury Salt on the Presence of Annelida (Lumbricus terrestris) in Soil and the Histological Changes on the Skin Tissue

Table 1

Number of worm deaths exposed to different concentrations of mercury chloride (HgCl2).

Concentrations	The number of worms	Deaths after 24 hours	Deaths after 48 hours	Deaths after 72 hours	Count the worms surviving after 21 days
1 ppm	36	0	0	0	36
5 ppm	36	0	0	0	36
10 ppm	36	0	0	0	36
50 ppm	36	0	0	0	35
100 ppm	36	6	18	30	0

One of the worms was killed after 14 days.