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在溶液的pH为6.0,均苯三甲酸(TMA)的浓度为2.0×10-4mol.L-1时,Eu3+-TMA体系可使Eu3+的荧光强度增大三个多数量级.光学惰性稀土La3+与Lu3+,在浓度分别为2.0×10-4mol.L-1、1.5×10-4mol.L-1时,可使Eu3+-TMA体系荧光强度分别增大178.1与91.3倍.体系中Eu3+的浓度在4.7×10-8~2.3×10-5mol.L-1的浓度范围内与体系的荧光强度呈线性关系,Eu3+的检出限达到了1.0×10-8mol.L-1.用此优化发光体系研究铕(III)在水稻不同生育期被水稻吸收后的分布定位情况.结果表明:铕(III)进入水稻后与水稻各部位的结合不是随机的,主要是在分蘖期与水稻的叶片结合.为稀土元素在水稻中的代谢研究提供了一种可借鉴的方法与研究手段.
Eu3 + -TMA system can increase the fluorescence intensity of Eu3 + by more than three orders of magnitude when the pH of the solution is 6.0 and the concentration of trimellitic acid (TMA) is 2.0 × 10-4mol.L-1. The optical rare earth La3 + Lu3 +, the fluorescence intensities of Eu3 + -TMA system were increased by 178.1 and 91.3 times when the concentrations were 2.0 × 10-4mol.L-1 and 1.5 × 10-4mol.L-1, respectively.The concentration of Eu3 + in the system was 4.7 × 10-8 ~ 2.3 × 10-5mol.L-1, and the fluorescence intensity of the system showed a linear relationship, the detection limit of Eu3 + reached 1.0 × 10-8mol.L-1. With this optimized luminescent system The distribution of europium (III) after being absorbed by rice in different growth stages of rice showed that the binding of europium (III) to rice was not random when entering rice and was mainly associated with rice leaves at tillering stage. Rare earth elements in rice metabolism provides a reference method and research methods.