Anomalous Fluctuation of Halogens in Relation to the Pollution Status along Lake Mariout, Egypt

Table 5

The multiple regression analyses of each halogen as dependent variable and other tested variables in the surface water, pore water, and sediment partitions, besides the precipitated salts in surface water along Lake Mariout.

Dependent variable	Multiple regression equation	R^2
Fluoride
Lake water	FW = 31.62 + 0.92 Zn F2 − 0.33 SiP + 0.21 CuI − 0.17 S‰P	0.9911
Pore water	Fp = −25.67 − 1.17 SiW − 0.33 LiP − 0.62 CuCl − 0.28 IS + 0.23 TDSW + 0.17 KIO4 − 0.12 BrW − 0.04 porosity + 0.04 PW	1.0000
Sediment	FS = 0.88 CAP − 0.49 MgS − 0.46 DOW + 0.39MgW + 0.27 Mn(IO3)2 + 0.15 Cu3(PO4)2 + 0.04 HAP + 0.02 pHP	1.0000
Chloride
Lake water	No relation	0.0000
Pore water	No relation	0.0000
Sediment	ClS = −1.16 + 0.46 MgP + 0.77 Kp − 0.49 dolomite + 0.17 TDSW − 0.11 CuI + 0.05 NaS + 0.02 BS + 0.01 FeF2	1.0000
Bromide
Lake water	BrW = 156.3 + 1.10 CuBr − 0.57 CuCl − 0.21 KS − 0.14 pHP − 0.11 TPS + 0.14 FeW + 0.07 ZnS − 0.02 PP + 0.01 turbidity	1.0000
Pore water	BrP = −15.16 − 0.55 FeS − 0.73 BS + 0.61 MnW + 0.83 SiP + 0.49 NaS − 0.31MnS − 0.15 CuBr + 0.11 pHW − 0.01 CaW	1.0000
Sediment	BrS = 0.15 SiP + 1.95 CFAP + 0.02 FP − 0.45 IS + 1.92 sand% + 0.37 MnW − 0.29 MgS − 0.12 LiP + 0.05 Ca3(PO4)2 − 0.02 ZnF2	1.0000
Iodide
Lake water	IW = 0.99 Ca(IO3).6H2O	0.9999
Pore water	IP = −0.97 ZnF2 − 0.57 Li3PO4 − 0.53 BP + 0.34 FAP + 0.15 Ca(IO3)2 + MnW + 0.05 KS − 0.09 turbidity + 0.55 CaS	0.9999
Sediment	IS = −0.72 + 1.35 SO4P + 0.23 Mn(IO3)2 + 0.63 FeW + 0.31 TPS − 0.35 MgP − 0.12 Zn(CO3)2.2H2O	0.9993