Publikationsdatum:
2021-07-16
Beschreibung:
The ecological situation of Maharloo Lake is of a great importance in the province, especially in relation with continuous addition of a reasonable volume of municipal and industrial effluents to it; one major point being a source for different life cycle stages of the crustacean Artemia, which is used in aquaculture as natural food. In order to improve our knowledge about lake's pollution, we investigate mineral nutrients and heavy metal concentration, among some other physical and chemical characteristics. Three stations were selected in the lake, sampling trips were made, and the concentration of selected factors were measured monthly from January 2000 to December 2001. Using ANOVA, results were used to compare means of monthly factors between three stations, and means of three stations between 12 months. The yearly means for pH, dissolved oxygen, salinity, electrical conductivity, water temperature, nitrite, nitrate, free ammonia, carbonate, bicarbonate, dissolved CO_2, phosphate, alkalinity, chloride, calcium, magnesium, total hardness, total dissolved solids, and total particulate matter were 7.95 (SD=0.558), 2.92ppm (SD=2.11), 290.73ppt (SD=168.08), 375.52ms/cm (SD=232.72), 20.8 C (SD=7.4), 0.051ppm (SD=0.058), 0.111ppm (SD=0.089), 3.342ppm (SD=2.894), 67.75ppm (SD=66.84), 270.88ppm (SD=190.91), 63.57ppm (SD=37.94), 0.018ppm (SD=0.026), 328.97ppm (SD=216.14), 128.05ppt (SD=76.65), 3334.90ppm (SD=4769.87), 22719.22ppm (SD=45204.82), 18059.73ppm (SD=12513.54), 203.20ppt (SD=132.40), and 8.65ppm (SD=5.49), respectively. Heavy metals' highest concentrations were as: As=23ppb, Co=303ppb, Cd=970ppb, Pb=8510ppb and Hg=25ppb, while no value was recorded in several months. Our results showed no significant differences between stations' means for most of the factors, but different months were significantly different in many factors (P〈0.05). Maharloo Lake demonstrated various levels of pollution regarding to nutrient minerals and heavy metals, but special attention to the relations of water- precipitations is needed for a more concise understanding of its pollution. Results of this investigation can serve as a good record of the lake situation in drought conditions.
Schlagwort(e):
Pollution
;
Iran
;
Maharloo
;
Maharloo salt lake
;
Saline lakes
;
Pollution
;
Nutrients
;
Heavy metals
;
Artemia
Repository-Name:
AquaDocs
Materialart:
monograph
Format:
application/pdf
Format:
application/pdf
Format:
64
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