Table 1 Instrumentation and methods to identify the physico-chemical variables with their ranges in the Samalpatti-Sevathur carbonatite complexes.
Variables | Instrument & Methods45,29 | Min | Max | Mean | WHO, 2022 | BIS, 2012 | % of samples crossed WHO | % of samples crossed BIS |
|---|---|---|---|---|---|---|---|---|
pH | PCS Testr 35-probe | 7 | 8.72 | 7.65 | 7–8.5.5 | 6.5–8.5 | 1.33 | 1.33 |
TDS (mg/L) | PCS Testr 35-probe | 477.14 | 1692.86 | 936.6 | 1500 | 2000 | 6.7 | 0 |
HCO₃⁻ (mg/L) | Titration - H2SO4 | 268.4 | 988.2 | 571.45 | 600 | 600 | 37.3 | 37.3 |
CO₃²⁻ (mg/L) | Titration - H2SO4 | 0 | 78 | 1.65 | -- | -- | -- | -- |
Ca²⁺ (mg/L) | Titration against EDTA | 32 | 140 | 67.04 | 200 | 200 | 0 | 0 |
Mg²⁺ (mg/L) | From TH and Ca²⁺ | 29.2 | 128.9 | 61.16 | 150 | 100 | 0 | 6.67 |
K⁺ (mg/L) | Flame Photometer– KCl stock | 1.62 | 31.5 | 9.34 | 12 | 12 | 32 | 32 |
Na⁺ (mg/L) | Flame Photometer – NaCl stock | 6.3 | 344.6 | 113.3 | 200 | 200 | 20 | 20 |
TH (mg/L) | Titration against EDTA | 230 | 690 | 419 | 500 | 600 | 20 | 8 |
Cl⁻ (mg/L) | Argentometric Titration | 28.36 | 709 | 138.2 | 600 | 1000 | 1.33 | 0 |
SO₄²⁻ in mg/L | UV-visible Spectrophotometer (Conditioning reagent with BaCl & Merck SO₄²⁻ standard) | 0.5 | 143.5 | 31.7 | 400 | 400 | 0 | 0 |
NO₃⁻ in mg/L | UV-vis Spectrophotometer (NO₃⁻ Standard-Merck) | 4.99 | 182.55 | 54.09 | 45 | 45 | 42.3 | 42.3 |
F⁻ (mg/L) | Ion meter (Merck - F⁻ standard and TISAB II) | 0.18 | 4.6 | 1.76 | 1.5 | 1.5 | 66.67 | 66.67 |
