| http://www.w3.org/ns/prov#value | - A method of measuring concentration of chlorine ions or calcium ions in a sample, said method comprising the steps of:(a) contacting in the presence of amylase a sample containing chlorine ions or calcium ions with a reagent of the formula: ##STR3## wherein X is a phenyl or substituted phenyl chromophore, whereby chlorine or calcium ions hydrolyze said reagent and release said chromophore; (b) det
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