| abstract |
REAGENT AND PROCEDURE FOR DETERMINING CATIONS ABSTRACT OF THE DISCLOSURE The invention is reagents and procedures for determining an amount of cations present in a sample, the reagent comprising (a) one or more chromogenic cryptand compounds of formula I (I) wherein k and j, either same or different, are equal to 1 to about 5; m and n, either same or different, are equal to 0 to about 4; a and e, either same or different, are equal to 0 to about 2; b and d, either same or different, are equal to 0 to about 5; R, either same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl, or aryl; and -Q- is , , or wherein X is CH, N, or COH; and Y includes , , , , , , , , , , and and (b) one or more interfering cation complexing compound masks. |