作　　者： ; ; ; ;

机构地区： 陕西师范大学化学化工学院

出　　处： 《应用化学》 2007年第2期144-147,共4页

摘　　要： 建立了一种测定痕量甲醛的新的长程吸收光谱法:采用超高亮红色发光二极管(LED)作光源,光电二极管作为光电检测器,9 cm液芯波导(LCW)管和光强差(ΔI)技术联用测定痕量甲醛。分析采用公共场所空气中甲醛测定标准方法,即国标GB/T18204．26-2000方法,其线性范围为1．0×10^(-11)～1．0×10^(-9)g/mL,检出限为7×10^(-12)g/mL,RSD(n=11,1×10^(-10))＜1％。实验结果表明,本方法的线性范围下限及检出限比通常的紫外-可见分光光度法均下降了1000倍以上。 A novel long path absorbance spectroscopy（LPAS） for the determination of trace formaldehyde was established. Trace formaldehyde was determined by the combination of liquid core waveguide （ LCW, 9 cm） and light intensity difference technique（ ΔI）, with an ultra bright red light emitting diode（LED） working as spectroscopic source and a photodiode as photodetector. It was analyzed following Chinese National Standard of determination for formaldehyde in public air, GB/Y18204.26-2000. The linear range and detection limit of the proposed method were 1.0 × 10^ -11 ～ 1.0 × 10^-9 g/mL, 7 ×10^ -12 g/mL, respectively. The relative standard derivation（RSD） for 1 × 10^-10 g/mL formaldehyde was less than 1.0% （n = 11 ）. The results shown that both the low limit of linear range and the detection limit of this method were over 1 000-fold lower than that of usual UV-Vis method.

关 键 词： 液芯波导 光强度差 甲醛 光度分析

领　　域： [理学] [理学]