Sodium Hazard 0.25 0.75 2.25 1 2 3 4 Class Salinity Hazard EC(dS/m) at 25 o C C1-S4 C1-S3 C1-S2 C1-S1 C2-S4 C2-S3 C2-S2 C2-S1 C3-S4 C3-S3 C3-S2 C3-S1 C4-S4 C4-S3 C4-S2 C4-S1
Sodicity A measure of the sodium [Na + ] concentration in relation to the calcium [Ca +2 ] and magnesium [Mg +2 ] concentrations of water
Sodicity Measurement Measured as the sodium absorption ratio of water (SAR w ) Expressed as the ratio: Na + / ([Ca +2 + Mg +2 ]/2) 1/2 Where the concentration of each ion is expressed in milliequivalents per liter (meq/L)
Problem With a water-quality report providing sodium, calcium, and magnesium concentrations as 76, 146, and 39 mg/L, how do we express these in meq/L?
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