قابلية الطحلب الأخضر Cladophora crispata على مراكمة المركبات الهيدروكاربونية و إنتاجها

Abstract EN

Seasonal samples have been collected of a green algae Cladophora crispata to study its capability of accumulation and producing hydrocarbon compounds by measuring the concentration of these compounds in the collection stage (first stage), then they cultured it in a laboratory by using Chu-10 medium during two times after (15 and 30) days to guarantee the purity of algae from hydrocarbon compounds which accumulated from the environment.

The concentrations of these compounds were measured in each period to determine the accumulation from the environment and the production from the alga itself.

The result were showed high concentration of compounds in the first period (directly after collecting time of the sample) which are (137.48, 48.79, 47.44, and 44.44) ng / g in Spring, Summer, Autum, and Winter respectively, and the decrease gradually at the second period (after 15 days) reaches (73.16, 11.33, 43.84, and 15.38) ng / g and at the third period (after 30 days) reaches (52.70, 10.65, 30.22, and 6.34) ng / g in the same sequence of the seasons.

PAHs have been identified by capillary GC and showing a seasonal variation with high concentration were observed during Summer at the first stage 72.04 ng / g wereas low concentration during Spring after one month of sample collecting and planting (1.21) ng / g.

Aliphatic compounds in alga also were determind and shows high concentrations during Winter at the first stage 186.17 ng / g wereas alow concentrations in Summer after 30 days of the collection of the sample 3.32 ng / g.

Carbon Preference Index (CPI) and pristane to phytane ratio were uses to identify the origin of the hydrocarbon compounds which were found to be both biogenic and anthropogenic resources.