Studies on catalytic kinetic spectrophotometric determination of trace nitrite

Based on the catalytic effect of trace nitrite on the oxidation of chlorophenol red with potassium bromate in the medium of H 3PO 4,a determination of nitrite was established by catalytic kinetic spectrophotometry.The linear range of the determination for nitrite is 0 04～14?mg/L with the detection limit of 0 007?mg/L,and the recoveries are between 98 7%～102%.This method is simple,fast,with good selectivity,and has been applied to the determination of trace nitrite in water,foods and soil samples with satisfactory results.