[Distinction between sodium chlorite and sodium hypochlorite by ion-chromatography].

A new method to distinguish between sodium chlorite and sodium hypochlorite by ion-chromatography is described. Under the operating condition (TSK-gel DEAE-5PW glass column 8.0 mm ID x 7.5 cm with an aqueous solution containing 20 mM sodium carbonate, 10 mM sodium hydroxide and 4 mM ethylenediamine) and electrochemical detector (Toso EC-8000, -200 mV, Ag-electrode), chlorite and hypochlorite anions were clearly separated and detected and the retention times (tR) were 6.0 and 4.6 min, respectively.

[Modified method for the identification of sodium chlorite and sodium hypochlorite as food additives].

New methods for the identification of sodium chlorite and sodium hypochlorite were proposed. Especially, spectrophotometric method was found to be especially distinctive and effective for the identification of both food additives (Figs. 1-3).