Elements for analysis of calcium

Details Elements for analysis of calcium Elements for analysis of calcium

1985-09-13

1986-06-10

Lacey, David L.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

422 57, 436 79, 436170, G01N 2178, G01N 3352

Patent

active

045942250

ABSTRACT:
An improved multilayer analytical element for the determination of calcium comprising a liquid impermeable, optically transparent support; at least one reagent layer positioned with a first side on said support and containing at least one reagent capable of reacting with a calcium component in a fluid sample; and at least one porous developing layer on the second side of said reagent layer, said porous developing layer being permeable to calcium from said fluid sample thereby transporting said calcium to said reagent layer. The improvement comprises at least one of said reagent layer and developing layer containing a basic substance of the formula M.sub.v H.sub.w PO.sub.4 .multidot.ZH.sub.2 O wherein M is lithium, sodium or potassium; v is an integer of 2 or 3 and w is an integer of 0 or 1 provided that v plus w equals 3; and Z is 1/2 when M is lithium, 0, 2 or 12 when M is sodium and 0 or 8 when M is potassium; and said reagent layer contains (i) 3,3'-bis[N,N-di(carboxymethyl)aminomethyl]-o-cresolphthalein and (ii) 8-hydroxyquinoline or a derivative thereof.

REFERENCES:
patent: 3798000 (1974-03-01), Helger
patent: 3934977 (1976-01-01), Cleaver
patent: 3938954 (1976-02-01), Stavropoulos et al.
patent: 3992158 (1976-11-01), Przybylowicz et al.
patent: 4050945 (1977-09-01), Suzuki
patent: 4066403 (1978-01-01), Bruschi
patent: 4144306 (1979-03-01), Figueras
patent: 4166093 (1979-08-01), Smith-Lewis et al.
CRC Handbook of Chemistry and Physics, 1966-1967 47th Edition, p. D-80.

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