EVALUATION OF SURFACE WATER QUALITY BY MULTIVARIATE STATISTICAL ANALYSES AND WQI: CASE OF COMLEKCI STREAM, (GIRESUN-TURKEY)

摘要

Qomlekqi Stream, Giresun, Turkey has been monitored to measure twenty-one pyhsico - chemical characteristics by taking monthly water samples from three different stations along its course during twelve-month study. The mean and standard deviation of water quality parameters were as follow: WT=13,28±6,5 °C, pH=8,03±0,57, EC= 139±61 pScm-1, Salinity= 0,101±0,04 ppt, TDS=103±37 mgL-1, DO= 11,38±2,39 mgL-1, DOS ()=106±18, SRP= 0,032±0,047 mgL-1, TP= 0,34±0,32 mgL-1, Chll-a= 2,86±2,49 pgL-1, TAN=0,44±0,38 mgL-1, BOD5 = 2,48±1,75 mgL-1, TA=54±17 mgL-1 CaCO3, TH= 81,6±30 mgL-1 CaCO3, Chlorine=0,047±0,026 mgL-1, Si= 4,15±1,2 mgL-1, Phenol= 0,046±0,03 mgL-1, NO2-N= 0,014±0,006 mgL-1, NO3-N= 0,60±0,39 mgL-1, SO4-2 =1,26±1,7 mgL-1, SO3-2= 1,96±0,21 mgL- 1. Water quality standards of WHO, water quality index (WQI) and Turkey’s Surface Water Quality Regulations (SWQR) were used to assess the water quality of the stream. Spatial and temporal variations and similarities, the relation between the sources and parameters of stream pollution were determined by using statistical analysis methods such as One-Way ANOVA, PCA, CA, PCI etc. All measured parameters were below the recommended threshold limit values with the exception of TP and chorine which both were classified as class III according to SWQR. The WQI values of Qomlekqi Stream were ranged between 33,52 and 43,3 with the mean value of 38,46. The water quality of the stream was classified as “good water” for all months and stations according to the these WQI values of the present study.