液芯波导与光强差技术测定食品中痕量亚硫酸根  

Determination of trace sulfite in food based on combination of liquid core waveguide and light intensity difference technique

作　　者：田穗康[1] 程晓宏[1] 章竹君[1] 田炜[1] 

机构地区：[1]陕西师范大学化学与材料科学学院,西安710062

出　　处：《分析试验室》2007年第3期15-17,共3页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(30470886)项目资助

摘　　要：采用超高亮绿色发光二极管作光源，使用9cm液芯波导管和光强差技术分光光度法测定食品中痕量亚硫酸根。分析采用国标GB／T5009．34-2003方法，线性范围的下限及检出限比通常的分光光度法均下降了1000倍。其线性范围为1．6×10^-11～1．6×10^-9g／mL，检出限为5×10^-12g／mL，RSD（n=11，1．6×10^-10g／mL）〈1％。Trace sulfite in food was determined by liquid core waveguide and light intensity difference technique. The ultra bright green light emitting diode was worked as spectroscopic source. Lowest of the linear range and detection limit were lower 1000 times than those by usual spectrophotometry. The linear range and detection limit were 1.6 × 10^-11 - 1.6 × 10^-9 g/mL, 5× 10^-12 g/mL, respectively. The relative standard derivation for 1.6×10^-10 g/mL was less than 1.0% （n = 11）.

关 键 词：液芯波导 光强差技术 亚硫酸根 光度法 

分 类 号：O657.3[理学—分析化学]