التراكم الحيوي لبعض العناصر الثقيلة و تأثيره في الدودة Namalycastis indica (الديدان الحلقية : عديدة الأهلاب)‎

الملخص EN

The present study was conducted to investigate the ability of the worm Namalycastis indica to accumulate some heavy metals in its tissues.

The heavy metals measured were Cadmium (Cd), copper (Cu), nickel (Ni), and cobalt (Co) after the exposure period for (14) days.

Further more the study included, the effect of these metals on the growth of N.

indica.

The worms were grown in media containing different concentrations of the above heavy metals.

These concentrations ranged from (5 to 250) ppm.

A flame atomic absorption spectrophotometer was used to measure the concentration of the heavy metals in the tissues of worm.

The worms showed high ability to accumulate Cd, Ni, Cu and Co.

An increase of heavy metals concentrations in the worm tissues were associated with the increase of these metals in media.

The maximum concentration of Cd, Ni, Cu, and Co in the worm tissues were (28.31, 12.22, 22.63, 10.67) ppm respectively.

At a concentration (250 ppm) in the media.

Different concentrations of Ca, Ni, and Cu resulted significant loss of weight of the worms .The Co showed the lowest effect on weight decrease of the worms, compared with the other metals.

It was also clear, the increasing effect of heavy metals on worms growth, with concentration increasing showed the maximum effect on weight loss Ca followed by Ni, Cu and Co, when worms grown in media contained (250 ppm) of the metals.