【摘要】 采用超高亮绿色发光二极管作光源,使用8 cm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/T 5009.33-2003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%。更多还原

【Abstract】 A method was developed for the determination of trace nitrite in food by using the combination of liquid core waveguide(8 cm) and light intensity difference measurement(LCW-ΔI).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-ΔI 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 0.999 5 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 0.999 6 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.更多还原