WATER HARDNESS DETERMINING METHOD Russian patent published in 2010 - IPC G01N33/18 G01N31/22 

FIELD: chemistry.

SUBSTANCE: invention refers to analytical chemistry relative to water hardness determination. Method is characterised by the fact that sample is taken and subsequently passed through indicator and reagent; at that, as indicator and reagent, there used is calmagite and silica gel modified with monoethanolamine respectively. Clear container is filled with the above substances without their being mixed. Sample is added to container from indicator side, and water hardness degree is assessed as per length of coloured section by using the following equation: H = 0.0001*L²+0.0012*L, where H - water hardness, mol eqv/l; L - length of coloured reagent section, mm.

EFFECT: simplifying the determining method with possibility of its being performed in field conditions.

1 dwg