Updated determination of trace amounts of zinc with dibromo-O-nitrophenylflurone by primary-secondary wavelength spectrophotometry

摘要

The reaction between zinc (Zn~(2+)) and dibromo-o-nitrophenylflurone (DBNPF) was studied at pH 9. It was sensitive and selective in the presence of fluoride and triethanolamine. Because of the effect of excess of DBNPF the new method named as primary-secondary wavelength spectrophotometry (PSWS) was applied instead of the ordinary spectrophotometry for the determination of trace amounts of zinc. Results showed that such a method gave out the better precision and higher accuracy than the ordinary method. By analyzing several samples, the relative standard deviations were less than 7.8% and the recovery rate of Zn between 93.3 and 110%.