Table 2. Physicochemical parameters of water samples before (C0) and after adding calcium chloride dihydrate in increased amounts (C1- C6).
| C0 | C1 | C2 | C3 | C4 | C5 | C6 | |
|---|---|---|---|---|---|---|---|
| Added calcium chloride
(g CaCl 2.2H 2O/L water) |
- | 0.0980 ±
0.0028 |
0.1656 ±
0.0023 |
0.2358 ±
0.0042 |
0.3072 ±
0.0006 |
0.3834 ±
0.0008 |
0.4554 ±
0.0071 |
| Calcium added(g/L) | - | 0.0267 ±
0.0008 |
0.0451 ±
0.0006 |
0.0642 ±
0.0012 |
0.0837 ±
0.0002 |
0.1044 ±
0.0002 |
0.1241 ±
0.0019 |
| Parameter | |||||||
| Hardness (mg/L CaCO 3) | 90.0±1.4 | 151.0±1.4 | 197.0±1.4 | 236.5±5.0 | 280.0 ± 1.4 | 311.0± 1.4 | 355.0 ± 7.1 |
| Calcium (mg/L Ca +2) | 22.00±1.41 | 48.50±0.71 | 67.30±3.18 | 91.00±2.83 | 108.00 ± 2.83 | 128.50 ± 2.12 | 140.50 ± 2.12 |
| pH | 6.990±0.014 | 7.095±0.007 | 7.125±0.035 | 7.140±0.014 | 7.090 ± 0.014 | 7.145 ± 0.007 | 7.115 ± 0.021 |
| Temperature (°C) | 22.60±0.14 | 22.85±0.07 | 22.90±0.14 | 22.85±0.07 | 22.85 ± 0.07 | 22.80 ± 0.14 | 22.75 ± 0.07 |
| Conductivity (mS/cm) | 0.615±0.021 | 0.765±0.007 | 0.860±0.004 | 0.965±0.007 | 1.060 ± 0.004 | 1.165 ± 0.007 | 1.265 ± 0.007 |
| Turbidity (NTU) | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 | <1.0 |
| Total alkalinity (mg/L CaCO 3) | 73.0±0.7 | 73.0±0.7 | 74.0±1.41 | 73.0±0.7 | 74.0 ± 1.4 | 73.0 ± 0.7 | 75.0 ± 0.7 |
| Bicarbonates (mEq/L HCO 3 - ) | 1.40±0.04 | 1.40±0.04 | 1.45±0.07 | 1.40±0.04 | 1.45 ± 0.07 | 1.40 ± 0.04 | 1.50 ± 0.04 |
| Carbonates (mEq/L CO 3 = ) | <0.08 | <0.08 | <0.08 | <0.08 | <0.08 | <0.08 | <0.08 |
| Total dissolved solids (mg/L) | 396.5±2.1 | 492.5±3.5 | 562.0±4.2 | 628.0±4.2 | 697.0 ± 5.7 | 767.5 ± 3.5 | 839.0 ± 1.4 |
| Chloride ion (mg/L Cl-) | 106.0±1.4 | 148.7±1.8 | 179.7±1.8 | 216.2±7.1 | 248.8 ± 3.4 | 292.8 ± 1.7 | 316.7 ± 7.1 |
| Colour (scale Pt-Co) | <2.5 | <2.5 | <2.5 | <2.5 | <2.5 | <2.5 | <2.5 |
| Langelier Index (LI) | -1.40±0.01 | -0.97±0.01 | -0.80±0.01 | -0.70±0.01 | -0.67 ± 0.01 | -0.56 ± 0.01 | -0.53 ± 0.02 |
Data are expressed in mean ± SD. NTU: nephelometric turbidity units