排序方式: 共有11条查询结果,搜索用时 10 毫秒
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综述了近年来(2000~2012年)分光光度法测定痕量铁的研究进展。内容包括:直接显(褪)色光度法、催化动力学光度法、阻抑动力学光度法、荧光光度法、化学发光分析法以及相关联用技术。对不同分析方法的反应介质、检出限、线性范围、实际应用对象等方面进行了归纳和概述, 并对分光光度法测定铁的发展提出了提高仪器性能, 以增强灵敏度和减少测量误差;开发灵敏度高、选择性强、稳定性好、绿色环保的显色剂, 以改善检测方法;加强与高效分离、富集检测技术的联用, 以降低测定干扰, 提高方法准确度等建议。 相似文献
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综述了近年来(2004—2013)分子光谱法测定铝(Ⅲ)的研究进展。内容包括:催化动力学光度法,普通光度法,荧光光度法,双波长光度法以及相关联用技术。对不同分析方法的反应介质、线性范围、检出限、实际应用对象等进行了概述,并对分子光谱法测定铝(Ⅲ)的研究方向与前景进行了展望:开发新型显色剂与环保荧光试剂,提高方法的特异选择性,缩短分析时间;引入电子计算机等人工智能系统,对信号处理、方法校正、实验设计等进行优化;加强与高效分离、富集检测技术联用,以减少测定干扰,实现对痕量铝(Ⅲ)的准确测定。 相似文献
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Fenton试剂与活化粉煤灰联合处理实验室废水研究 总被引:1,自引:0,他引:1
实验室废水含有各种酸、碱、重金属盐和有毒有害污染物,严重污染环境.采用Fenton氧化和活化粉煤灰吸附联合处理,研究其处理实验室废水的可行性.实验结果表明,在溶液pH值为4,FeSO4·7H2O投加量为0.2 g,H2O2用量为1.5 mL,反应时间为60 min,反应温度为40 ℃时,Fenton氧化对实验室废水CODCr的去除率达76.5%;在pH值为4,活化粉煤灰投加量为1.5 g,搅拌时间为20 min时,活化粉煤灰对经上述Fenton氧化后的废水CODCr去除率达60.1%.经这两级工艺处理后CODCr去除率达89.2%. 相似文献
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In this paper, the Ag2O nanowires had been prepared and applied for the fabrication of ascorbic acid sensors with high enhanced sensitivity by using self-assembly technology. The structures and morphologies of Ag2O nanowires were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The direct electrocatalytic oxidation of ascorbic acid in alkaline medium at Ag2O nanowires modified electrodes had been investigated in detail and the condition for determination of ascorbic acid was optimized, such as support-electrolyte, pH and scan speed. The oxidation peak current changed linearly with the concentration of ascorbic acid over the range from 2.0×10-8 mol/L to 1.0 mmol/L, and the detection limit can reach 1.0×10-8mol/L. Compared to a bare Ag electrode, a substantial decrease in the overvoltage of the ascorbic acid oxidation was observed at the Ag nanowires electrodes with oxidation starting at ca. 0.7V vs. Ag/AgCl (saturated KCl). The Ag2O nanowires modified electrode allows highly sensitive, low working potential, stable, and fast amperometric sensing of ascorbic acid, thus is promising for the future development of non-enzymatic ascorbic acid sensors. 相似文献
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