Liang Aihui, Peng Jing, Liu Qingye, Wen Guiqing, Lu Zhujun, Jiang Zhiliang
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Conservation of Education Ministry, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guangxi Normal University, Guilin 541004, China.
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Conservation of Education Ministry, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guangxi Normal University, Guilin 541004, China.
Food Chem. 2015 Aug 15;181:38-42. doi: 10.1016/j.foodchem.2015.02.078. Epub 2015 Feb 20.
In pH 4.0 acetate buffer solution, fluorine ions react with fluorine reagent (FR) and La(III) to generate blue ternary complex that exhibited strong absorption at about 370 nm. Upon addition of graphene oxide/nanogold (GO/NG) as resonance Rayleigh scattering (RRS) spectral probe with strong RRS peak at 370 nm, the color changed to gray, and the RRS intensity decreased with the increase of fluorine ion concentration due to the RRS energy transfer (RRSET) from GO/NG to the complex. Under the selected condition, the decreased RRS peak ΔI370 nm was linear to fluorine ion concentration in the range of 6.0 × 10(-8)-1.3 × 10(-5)mol/L, with a detection limit of 3.0 × 10(-8)mol/L F(-). This RRSET method was applied to the analysis of fluorine in toothpaste and water samples, with satisfactory results.
在pH 4.0的乙酸盐缓冲溶液中，氟离子与氟试剂（FR）和La(III)反应生成蓝色三元络合物，该络合物在约370 nm处有强烈吸收。加入氧化石墨烯/纳米金（GO/NG）作为在370 nm处有强共振瑞利散射（RRS）峰的RRS光谱探针后，颜色变为灰色，并且由于RRS能量转移（RRSET）从GO/NG到络合物，RRS强度随氟离子浓度的增加而降低。在选定条件下，降低的RRS峰ΔI370 nm与氟离子浓度在6.0×10(-8)-1.3×10(-5)mol/L范围内呈线性关系，检测限为3.0×10(-8)mol/L F(-)。该RRSET方法应用于牙膏和水样中氟的分析，结果令人满意。
