液芯波导与光强差技术对食品中痕量亚硝酸根的测定  

Determination of Trace Nitrite in Food by the Combination of Liquid Core Waveguide and the Light Intensity Difference Measurement

作　　者：程晓宏[1] 章竹君[1] 田穗康[1] 田炜[1] 

机构地区：[1]陕西师范大学化学与材料科学学院,陕西西安710062

出　　处：《分析测试学报》2008年第3期310-312,共3页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(30470886)

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 

分 类 号：O657.39[理学—分析化学] O612.5[理学—化学]