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Comparing ecological risks of pesticides on unicellular freshwater green alga; pseudokirchneriella subcapitata using a risk quotient ranking approach [electronic resource].

By:

Abd-Allah, Salwa M

Contributor(s):

Gouda, Neama A

Language: English Summary language: Arabic Description: P.1001- 1011Other title:

مقارنة المخاطر البيئية للمبيدات علي طحالب المياه العذبة الأخضر وحيد الخلية pseudokirchneriella subcapitata بأستخدام منهج تصنيفي لمحصلة الخطر [Added title page title]

Uniform titles:

Mansoura University journal of plant protection and pathology, 2012 v. 3 (9) [electronic resource].

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Full Text Article.

In: Mansoura University Journal of Plant Protection and Pathology 2012.v.3(9)Summary: Environmental risk assessment of pesticides often uses the Risk Quotient (RQ) method to characterize risk quantitatively. Toxicological effects of pesticides (for 5 fungicides, 4 herbicides and 6 insecticides formulations) were assessed on the green alga Pseudokirchneriella subcapitata. For each tested pesticide, 96-h acute toxicity test was conducted and toxicity end-points and RQ values based on refinement of exposure concentrations were evaluated. Risk presumptions were presented along with the corresponding level of concern (LOC). Toxicity data indicated differential numerical ranking of pesticides within each pesticide category. For fungicides; mancozeb was found to be the most toxic and difenoconazole was the least toxic (3006 and 93 fold of toxicity; respectively). As related to herbicides, metribuzin was the most effective (1349 fold of toxicity), while cryomazine was practically non-toxic. Moreover, abamectin proved to be the extremely toxic insecticide (5511 fold of toxicity).

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Environmental risk assessment of pesticides often uses the Risk Quotient (RQ) method to characterize risk quantitatively. Toxicological effects of pesticides (for 5 fungicides, 4 herbicides and 6 insecticides formulations) were assessed on the green alga Pseudokirchneriella subcapitata. For each tested pesticide, 96-h acute toxicity test was conducted and toxicity end-points and RQ values based on refinement of exposure concentrations were evaluated. Risk presumptions were presented along with the corresponding level of concern (LOC). Toxicity data indicated differential numerical ranking of pesticides within each pesticide category. For fungicides; mancozeb was found to be the most toxic and difenoconazole was the least toxic (3006 and 93 fold of toxicity; respectively). As related to herbicides, metribuzin was the most effective (1349 fold of toxicity), while cryomazine was practically non-toxic. Moreover, abamectin proved to be the extremely toxic insecticide (5511 fold of toxicity).

Summary in Arabic.

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