It was found that the inhibition and enhancement by phloroglucinol of the chemiluminescence from the luminol-K3Fe(CN)6 system were dependent on the pH of luminol solution and the concentration of phloroglucinol. In Na2CO(3)-NaHCO3 buffer, phloroglucinol exhibited strong chemiluminescent enhancement at pH 9.4. On this basis, a flow injection method was developed for the determination of phloroglucinol. The method was simple, rapid, convenient and sensitive, with a detection limit of 2.0 x 10(-9) mol/L. It is effective for determining phloroglucinol in the range of 1.0 x 10(-5)-5.0 x 10(-9) mol/L. The relative standard deviation is 1.3% within one day and 3.2% between days for the determination of 5.0 x 10(-7) mol/L phloroglucinol. The method has been successfully used to determine phloroglucinol in environmental water, with satisfactory results.
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