酚试剂法测定室内空气中甲醛的实验条件优化-河北工业科技.pdf

27 6 河 北 工 业 科 技 Vol. 27, No . 6 2010 11 H ebei Journal of Industrial Science and T echnology No . 20 10 : 1008- 1534( 2010) 06-0417- 04 , , ( 河北科技大学环境科学与工程学院, 河北石家庄 0500 18) : 为了提高酚试剂法测定室内空气中 醛的准确性, 优化实验条件, 系统研究了盐酸介质浓 度显色剂加入量显色时间显色反应温度和稀释液类型等因素对吸光度的影响, 研究结果表明, 采用0. 1 mol/ L 盐酸配制的硫酸铁铵显色剂, 显色剂加入量对吸光度影响不显著, 最佳加入量为 0. 4 mL; 显色反应温度对吸光度影响明显, 最佳温度应控制在 25~ 35 范围内; 稳定的显色反应 时间应控制在 18~ 30 min 内, 以20 min 为宜; 当 醛质量浓度较高时, 可选用去离子水或酚试剂 吸收液进行适当的稀释在较优的实验条件下, 测定的 醛质量浓度与吸光度在0~ 2. 0 g / mL 范围内呈良好的线性关系, r = 0. 999 9 : 醛; 室内空气; 酚试剂法; 条件优化 : X511 : A Study on optimal experimental conditions of phenol reagent method for determining formaldehyde in indoor air WANG Xin-jie, ZHAO Wen-x ia, ZHU Jin-cang ( College of En ironmental Science and Engineering , H ebei Uni ersity of Science and T echnology, Shijiazhuang H ebei 050018, China) Abstract : For im pro ing the accuracy of the phenol reagent spectrophotomet ric determining formaldehy de in indoor air and ob- taining the optimal experimental conditions, in this paper the effects of t he concentrat ion of hy drochloric acid, the color reagent usage, color reaction time, temperature on the absorbance and the diluent were studied. T he results show that the new color reagent, ammonium ferric sulfate solution, is prepared by 0. 1 mol/ L hy drochloric acid; the effect of clour reagent usage on the absorbance is not significant, and the best addition is 0. 4 mL ; the effect s of temperature on the absorbance is significant, and the best color reaction temperature should be controlled at within 25~ 35 ; the stable color reaction time should be controlled at w ithin 18~ 30 min, and 20 min is most appropriate. When the concentration of formaldehyde in air is relati ely high, phenol reagent or deionized