1962
DOI: 10.1021/ac60193a034
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Alizarin Acid Black SN as a Metallochromic Indicator for Calcium. Nature and Stability of Its Calcium Chelates.

Abstract: nature and stability of the calcium chelates of Alizarin Acid Black SN, an excellent and unusual metallochromic indicator for calcium, are established directly with the aid of calcium buffers. The reaction of the indicator with calcium is complex. Two major complexes exist: a red species, CazZz, stable above pH 11 and pCa 4, and a purple-blue species, CazZ, stable below pCa 4. These account for the dual color change ob-

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Cited by 8 publications
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