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This International Standard specifies a method for the determination of the dissolved cations Li+, Na+ NH4+, K+, Mn2+, Ca2+, Mg2+, Sr2+ and Ba2+ in water (e.g. drinking water, surface water, waste water).

An appropriate pretreatment of the sample (e.g. dilution) and the application of a conductivity detector (CD) make the working ranges given in table 1 feasible.

The applicability of the method for waste water samples should be proved in each case.

Table 1 - Working ranges of the analytical method
CationTypical working range with 10 μl loop mg/l1)
Lithium0,01 to 1
Sodium0,1 to 10
Ammonium0,1 to 10
Potassium0,1 to 10
Manganese0,5 to 50
Calcium0,5 to 50
Magnesium0,5 to 50
Strontium0,5 to 50
Barium1 to 100
1) The working range is limited by the ion-exchange capacity of the separator column.If necessary, the sample shall be diluted to meet the working range, or use a 100 μl loopfor lower working ranges.