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在1.0×10-4mol·L-1的H2SO4中,牛血红蛋白催化H2O2氧化苯甲酸生成羟基苯甲酸,羟基苯甲酸在碱性溶液中有强荧光,据此提出了一种测定痕量H2O2的方法。在激发波长295 nm与发射波长408 nm处,反应体系的荧光增加值ΔF与H2O2的浓度在7.880×10-8~1.182×10-4mol·L-1范围内存在良好的线性关系。线性回归方程为:ΔF=7.418×106c+9.742(c的单位为mol·L-1),相关系数r=0.9994。检出限为5.26×10-8mol·L-1。将方法用于雨水及消毒液中H2O2的测定,结果满意。 相似文献
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Microlasers based on high quality(Q) whispering-gallery mode(WGM) resonance are promising low threshold laser sources for bio-sensing and imaging applications. In this Letter, dye-doped polymer microspheres were fabricated by a controlling emulsion solvent evaporation method. WGM lasing with low threshold and high Q factors was realized in an individual microsphere under femtosecond laser pumping. The slight change of environmental relative humidity(RH) can be monitored by measuring the shift of the lasing modes at the exposure of water molecules, which demonstrates the sensitivity is as high as 6 pm/RH%. The results would offer an insight into employing microlasers as sensors. 相似文献
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