Diagnosis of the Diatom Community upon Biofilm Development on Stainless Steels in Natural Freshwater

Table 2

Mean parameters of freshwater (Verberie site, Oise river, France).

Parameter	Unit	Data	Standard deviation
pH	—	7.96	0.19
Temperature	°C	13.72	5.87
Conductivity at 25°C	μS·cm^−1	617.64	59.38
Turbidity	NTU	21.92	21.84
Total suspended matter	mg·L^−1	27.88	26.95
COD	mg·L^−1	15.67	6.82
Redox potential	mV	160.17	26.57
BOD5 at 20°C	mg·L^−1	2.08	0.83
Dissolved oxygen	mg·L^−1	10.36	1.55
Chloride [Cl^−]	mg·L^−1	29.00	7.38
Bicarbonate []	mg·L^−1	280.17	25.90
Carbonate []	mg·L^−1	2.62	0.49
Phosphate []	mg·L^−1	0.5	—
Nitrate []	mg·L^−1	17.14	3.71
Nitrite []	mg·L^−1	0	0
Sulfate []	mg·L^−1	38.17	6.18
Na	mg·L^−1	17.00	5.87
Mg	mg·L^−1	7.50	1.38
Silica (SiO2)	mg·L^−1	11.13	0.99
Chlorophyll a	µg·L^−1	4.25	4.10

Data based on three-year average from the French Water Agency for Seine-Normandy Water (http://www.eau-seine-normandie.fr).