作　　者： ; ; ; ;

机构地区： 陕西师范大学化学化工学院

出　　处： 《分析测试学报》 2008年第3期310-312,共3页

摘　　要： 采用超高亮绿色发光二极管作光源，使用8cm液芯波导管和光强差测量技术测定食品中的亚硝酸根。样品分析采用国标GB／T5009.33-2003方法，线性范围的下限及检出限比通常的分光光度法低3个数量级。其线性范围为4×10^-8－4×10^-6g／L，检出限为2×10^-8g／L，RSD（n=11，8×10^-7g／L）小于1％。 A method was developed for the determination of trace nitrite in food by using the combina- tion of liquid core waveguide（8 cm） and light intensity difference measurement（LCW-△I）. An ultra bright green light emitting diode（LED） was used as the light source. A comparison of the analytical performances of the classical method viz. GB/T 5009.33-2003 and the proposed LCW-△I method for trace nitrite was made. The results showed that the linear range for the classical method was 4×10^-5-5×10^-4 g/L with a correlation coefficient of 0.9995 and a detection limit of 2×10^-5 g/L, and that for the proposed method was 4×10^-8-4×10^-6 g/L with a correlation coefficient of 0.9996 and a detection limit of 2×10^-8 g/L. The analytical results of nitrite in several kinds of food obtained by the proposed method agreed quite well with those obtained by the classical method but with improved precision.

关 键 词： 液芯波导 光强度差 光度分析 亚硝酸根

领　　域： [理学] [理学] [理学] [理学]