Analysis of Water Samples
- Total concentration of soluble salts assessed through EC.
- Relative proportion of Na to other Cations such as Ca and Mg, referred to as the Sodium Adsorption Ratio (SAR).
- Concentration of B and other elements that may be toxic to plants.
- Concentration of Carbonates and Bicarbonates as related to the concentration.
- Ca plus Mg, referred to as residual Sodium Carbonate (RSC).
- Content of anions such as chloride and sulphate.
|1||pH||Acidic , Neutral or Basic|
|2||Electrical Conductivity||Ideal value is less than 0.75 mS/cm|
|3||Available S||Precipitation Method|
|4||Calcium||EDTA Titration Method|
|5||Magnesium||EDTA Titration Method|
|6||Sodium adsorption ratio||safe: < 10 And unsafe: > 26|
|7||Sodium||Flame Photometer Method|
|8||Carbonates and bicarbonates||Simple acidimetric titration|
|9||Chloride||Mohr’s Titration Method|
|10||Residual Sodium Carbonate||safe: < 1.25 And unsafe: > 2.5|
The limits can vary depending on the type of soil, rainfall and climate conditions. Higher RSC values can be considered safe for sandy soils in a high rainfall area (> 600 mm/year).