Geothermal water as a nutrient medium source on the biomass productivity and biochemical composition of Spirulina (Arthrospira platensis) under the greenhouse conditions

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Table 1

Physicochemical properties of experimental mediums.

		SM	GW25	GW50	GW75	GW100
Physical parameters
Turbidity	NTU	2.00	13.10	18.40	19.10	17.90
Physicochemical parameters
pH	pH	9.27	9.14	8.93	8.57	8.23
Electrical Conductivity	EC (μS/cm)	21.75	17.27	12.27	7.54	2.83
Density	Density (g/cmᶟ)	1.02	1.01	1.01	1.00	1.00
Chemical parameters
Salinity	Salinity (‰)	13.00	10.10	7.20	4.20	1.50
Hardness	Hardness (Fr°)	13.60	17.40	18.90	21.60	83.60
Anions (mg/L)
Carbonate	CO₃⁻²	558.00	393.00	246.00	65.40	184.80
Bicarbonate	HCO₃⁻	14945.00	11437.50	7442.00	3464.80	579.50
Nitrate	NO₃⁻	66.00	70.40	162.80	250.80	18.92
Nitrite	NO₂⁻	0.89	0.09	0.06	0.07	0.03
Sulphate	SO₄⁻²	640.00	630.00	680.00	620.00	840.00
Phosphate	HPO₄⁻²	0.09	10.00	0.19	10.50	0.74
Chloride	Cl⁻	760.40	622.48	506.94	435.04	256.23
Fluoride	F⁻	18.70	17.70	5.75	3.30	3.25
Bromide	Br⁻	3.00	3.70	3.00	2.80	1.90
Iodide	I⁻	0.41	0.02	0.02	0.03	0.02
Cations (mg/L)
Sodium	Na⁺	6322.25	4919.86	3149.63	1839.20	390.83
Potassium	K⁺	136.85	136.85	113.39	91.89	11.73
Magnesium	Mg⁺²	27.35	37.68	40.72	46.80	196.91
Calcium	Ca⁺²	9.32	7.46	8.39	9.32	10.25
Manganese	Mn⁺²	0.01	0.02	0.01	0.02	0.23
Iron	Fe⁺²	2.20	0.53	0.22	0.09	0.31
Insoluble Matters
Metasilicic acid	H₂SiO₃	3.90	2.60	22.09	83.17	116.96
Total Mineralization		22936.00	17891.60	11635.20	6857.82	2427.81
Trace Elements
Arsenic	H₃AsO₄⁻²	0	0	0	0	0
Cadmium	Cd⁺²	0.0002	0.0011	0.0009	0.0007	0.012
Chromium	Cr⁺³	0.02	0.01	0.01	0.01	0.02
Mercury	Hg⁺²	0	0	0	0	0
Nickel	Ni⁺²	0.003	0.002	0.001	0.005	0.004
Lead	Pb⁺²	0.042	0.029	0.033	0.021	0.009
Antimony	Sb⁺⁵	0	0	0	0	0
Selenium	Se⁻²	0.5	0.01	0	0	0
Barium	Ba⁺²	<2	<2	<2	<2	<2
Copper	Cu⁺²	0.10	0.21	0.02	0.12	0.24
Zinc	Zn⁺²	0.18	0.20	0.28	0.36	0.24
Aluminum	Al⁺³	0	0	0	0	0
Molybdenum	Mo⁺⁶	0	0	0	0	0
Argent	Ag⁺	0	0	0	0	0
Cyanide	CN^–	0.012	0.003	0.002	0.004	0.004

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