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                       * Selectivity coefficient is a concentration ratio of the interfering ion 
                          against the target ion, which affects the target ion measurement
                          value. For example, selectivity coefficient of potassium ion against
                          sodium ion is 1×10-2, which means for the same concentration of
                          potassium ion and sodium ion coexisting in a sample, the sodium
                          measurement shows approximately 1×10-2(1%) higher result.