Research Article

Study of Physico-Chemical Characteristics of Wastewater in an Urban Agglomeration in Romania

Table 2

Correlation coefficients calculated for station S1 to S5. Significant correlations at each type of stations are identified as follows: boldface italicized fonts for industrial station (S5), italicized fonts for domestic stations (S1 and S3) and boldface fonts for mixed stations (S2 and S4).

Correlation factorCODpHN-NO3P-PO4AlFeCd

S10,21
S20,00
pHS3−0,30
S4−0,15
S50,41

S10,360,40
S20,200,53
N-NO3S3−0,760,61
S40,280,49
S5−0,22−0,30

S10,140,120,01
S20,52−0,060,00
P-PO4S30,61−0,18−0,54
S40,60−0,420,05
S50,570,31−0,28

S1−0,11−0,21−0,370,03
S20,66−0,260,000,51
AlS30,380,180,000,01
S4−0,260,050,33−0,04
S50,080,02−0,090,54

S10,480,130,030,550,00
S2−0,060,100,11−0,16−0,09
FeS30,60−0,55−0,540,520,04
S4−0,210,240,21−0,100,15
S5−0,13−0,16−0,12−0,02−0,33

S10,370,670,400,61−0,290,46
S2−0,02−0,49−0,100,180,21−0,64
CdS30,48−0,79−0,550,200,090,69
S40,39−0,150,290,430,200,40
S50,03−0,11−0,54−0,04−0,32−0,10