Stabilized aquous diazo solutions

摘要

A stabilized aqueous solution of a diazo compound has the formula: <CHEM> where X<1> is selected from nitro and chloro, X<2> is selected from nitro, chloro and nothing, and Y is an acid-derived anion. The solution has a pH of about 1.5 or below and a diazo concentration of about 2 wt% or less. The solution is useful as an extractant/developer for petroleum fuel markers.