Publication Date:
2021-05-19
Description:
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 CO2, 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.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Saline lakes
;
Pollution
;
Nutrients
;
Heavy metals
;
Artemia
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
64pp.
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