OXYGEN Sodium hydrogen sulphate

HTAC cationic micelles also markedly enhance the CL intensity of fluorescein (FL) in the oxidation of hydrogen peroxide catalyzed by horseradish peroxidase (HRP) [39], However, no CL enhancement was observed when anionic micelles of sodium dodecyl sulphate (SDS) or nonionic micelles of polyoxyethylene (23) dodecanol (Brij-35) were used (Fig. 9). CL enhancement is attributed to the electrostatic interaction of the anionic fluorescein with the HTAC micelles. The local concentration of fluorescein on the surface of the micelle increases the efficiency of the energy transferred from the singlet oxygen (which is produced in the peroxidation catalyzed by the HRP) to fluorescein. This chemiluminescent enhancement was applied to the determination of traces of hydrogen peroxide. The detection limit was three times smaller than that obtained in aqueous solution. 

Detection Dry Tests.—Chromium compounds when reduced on charcoal leave a dark green residue if the substance be first mixed with sodium carbonate, the fused mass obtained gives a yellow solution with water, the tint of which deepens on addition of sulphuric acid in the presence of zinc, zinc chromate, which is insoluble in the alkaline solution, is formed. On heating a chromate in a dry tube with a little potassium hydrogen sulphate, a red or green liquid may be formed with evolution of oxygen. Some chromates evolve oxygen when... 

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