On-line Determination of Formaldehyde in Tannery Effluent by Reverse Reference Flow Injection Analysis with Phenol Reagent

摘要

一种新型的反相参比流动注射法(rrFIA)与酚试剂分光光度法相结合，测定制革废水中的甲醛。经测定选择显色物质的最佳吸收波长为630nm 。优化了影响甲醛测定的反应试剂浓度和rrFIA系统参数。在最优条件下，方法的线性范围是0,005〜1.0mg/L ，检出限是4.01μg/L ，精密度是0.583% 。此法与国标比较误差在±5%范围内，方法简单、方便，可应用于制革废水中甲醛的测定。%A novel reverse reference flow injection analysis (rrFIA) method coupled with spectrophotometric detection is described for the determination of formaldehyde in tannery effluent. The absorbance of the complex is measured at 630nm. Chemical factors and rrFIA variables affecting the system are also discussed. Under the optimal conditions, the linear range of this method is 0.005-1.0mg·L~(-1); the detection limit is 4.01 μg·L~(-1); the precision is 0.583%. Comparing the method with the National Standard Method of China, the error is within ± 5% which meets the requirements. The proposed method is simple and convenient for the determination of formaldehyde in tannery effluent.