Table 1.

Min, max, and average ± standard deviation of physicochemical parameters and surfactant concentration of El-Max Bay waters

Parameters		Spring	Summer	Autumn	Winter
Temperature (°C)	S	19.20–25.10	28.90–31.45	20.00–22.00	18.00–20.00
		21.81 ± 2.13	29.93 ± 0.95	21.21 ± 0.85	18.82 ± 0.88
	B	18.00–25.10	29.20–31.45	20.00–22.00	17.00–20.00
		20.92 ± 2.35	29.85 ± 0.82	21.17 ± 0.78	18.34 ± 1.14
pH value	S	7.74–8.48	7.52–8.55	7.28–8.15	7.75–8.45
	B	7.71–8.14	7.41–8.05	7.30–8.10	7.72–8.25
D O(mg/l)	S	2.98–8.27	1.45–5.17	1.17–6.83	3.58–8.45
		4.91 ± 2.04	4.36 ± 1.81	4.19 ± 2.11	5.79 ± 2.40
	B	2.14–4.32	1.42–5.08	1.18–5.46	2.90–9.47
		3.37 ± 1.07	3.08 ± 1.68	4.07 ± 1.91	5.90 ± 2.65
OOM (mg/l)	S	0.96–3.84	3.00–7.49	1.20–8.40	2.00–6.38
		2.11 ± 1.18	4.33 ± 1.78	3.53 ± 2.68	3.67 ± 1.78
	B	0.12–3.12	0.60–7.33	0.60–6.89	0.52–6.11
		1.21 ± 1.17	3.32 ± 3.56	2.39 ± 2.47	2.32 ± 2.36
Salinity (PSU)	S	3.89–32.38	3.71–29.61	4.60–38.66	4.51–40.09
		20.84 ± 11.30	19.32 ± 10.59	23.26 ± 15.35	20.34 ± 13.80
	B	3.91–41.34	4.25–38.86	5.22–39.18	5.31–42.73
		29.79 ± 16.67	28.34 ± 15.59	28.96 ± 15.45	28.68 ± 15.97
Total Hardness (mg CaCO3/l)	S	1.39–6.44	1.39–7.77	1.48–8.41	1.74–8.99
		4.04 ± 2.10	4.72 ± 2.67	4.91 ± 2.83	5.00 ± 2.88
	B	2.31–8.41	2.54–8.47	2.47–8.87	2.50–8.90
		5.79 ± 2.69	6.48 ± 2.56	6.35 ± 2.99	5.50 ± 2.30
Total Alkalinity (g/l)	S	0.31–0.48	0.33–0.48	0.27–0.47	0.27–0.48
		0.38 ± 0.07	0.39 ± 0.05	0.36 ± 0.09	0.38 ± 0.08
	B	0.25–0.31	0.26–0.41	0.27–0.41	0.25–0.46
		0.26 ± 0.03	0.30 ± 0.06	0.31 ± 0.06	0.33 ± 0.09
Surfactant (mg LAS/l)	S	0.05–0.41	0.09–0.48	0.06–0.29	0.03–0.27
		0.16 ± 0.14	0.18 ± 0.11	0.15 ± 0.09	0.13 ± 0.07
	B	0.04–0.31	0.06–0.26	0.06–0.21	0.03–0.17
		0.13 ± 0.10	0.12 ± 0.08	0.11 ± 0.06	0.07 ± 0.06

S surface, B bottom