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Determination of the Bromate in Water Based on 1,10-Phenanthroline Fade—Subtracted the Amount of Fe2+— Spectrophotometry
LI Xiu-ping, ZHAO Rong-xiang, LI Dan-dong
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421
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The weight percentage of Fe2+ can be determined with 1,10-phenanthroline as chromogenic agent, and Fe2+ would be oxidized by bromate to Fe3+ and then 1,10-phenanthroline faded. Therefore, the content of bromate in water can be indirectly determined according to the stoichiometry amount of Fe2+. The linear range, detection limit, recovery, chromogenic conditions were studied and found that the recovery is 92.5%~108.7%, detection limit is 15~36 ng/L, the precision is less than 0.312.
2012, 32 (2): 27-31.
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Iodiometry-Spectrophotometric Determination of Bromate in Water
LI Xiu-ping, ZHAO Rong-xiang, SHEN Chun-yu
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554
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Ultraviolet-visible spectrophotometry was used to determinate the content of bromate in mineral water and drinking water. The effect of reaction time, dosage of hydrochloric acid, dosage of potassium iodide, working curve and recovery were studied, and the content of bromate in mineral water and drinking water was tested ]in absence of the light as 10.33 and 9.33 μg/L, respectively. The recovery of mineral water is 96.03%~105.59%, while the recovery of drinking water is 95.89%~96.12%. The precision and detection limit of this method are 0.36 and 0.108, respectively.
2011, 31 (1): 9-12.
DOI:
10.3696/j.issn.1672-6952.2011.01.003
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Preparation and Growth Mechanism of ZnO With Spindle Shape
ZHAO Rong-xiang, CAO Qun, CHEN Hai-li, LI Xiu-ping
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371
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ZnO with spindle shape was synthesized by ultrasonic-assisted reflux method. The micrograph and structure of ZnO sample were charactered by SEM, TEM and XRD.The results show that basic content of solution, ultrasonic treatment and the mass of diethanolamine play an important role on the formation of ZnO with spindle shape. The growth mechanism of ZnO with spindle shape was discussed. Furthermore, the optical properties of ZnO with spindle shape were revealed by UV-Vis and fluorescence spectroscopy.
2009, 29 (4): 43-46.