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Study on the Detection of Melamine ,ions of Mercury and Lead by Using Series of Hydroxylphenylporphyrins

Author: ZuoXingJu
Tutor: FaHuanBao
School: Chongqing University
Course: Chemistry
Keywords: porphyrins melamine ions of mercury and lead UV-Vis absorbance
CLC: O657.3
Type: Master's thesis
Year: 2010
Downloads: 139
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Abstract


A large number of wastewater, waste gas and waste residue were discharged to the environment with human activities and the rapid development; and now the pollution is affecting the quality of people’s life seriously. A lot of harmful pollutants such as pesticides ,difficult decomposed products and heavy metal ions are released into the soil and the rivers at the same time. China’s Sanlu milk powder is known by the world in 2008. Heavy metal ions are potentially harmful and important pollutants, and it can cause environmental pollution even at low level. So it is a great significance to establish the trace analysis determination technology of melamine and heavy metal ions. UV-visible spectrophotometry is commonly used to trace analysis for the advantages of its high sensitivity, high recovery, low detection and simple operation.The porphyrin compounds are organic semiconductor materials that have excellent optical properties. It has been widespread attended in modern chemical research by more and more scientists. They have been applied to various fields especially in the photochemical analysis because of high sensitivity, good selectivity and high stability.In our researchs, we synthesized six kinds of different porphyrins by using of benzaldehyde, p-hydroxybenzaldehyde and the new steamed pyridyl. These six differert kinds of compounds have similar structures but different characters. And then we separate and purify them through column chromatography. At last we characterized six compounds by elemental analysis, 1HNMR, UV-vis and IR,spectrum, respectively, which proved that these compounds are the target products.We explored the mechanism of organic synthesis and separation methods through column chromatography.The complexing reaction of melamine and metal ions (lead and mercury) with six different porphyrins were studied with spectrophotometric analysis method. The affection of the Tween-80, NaOH, tempertrue and time of the reactions were studied. The detection limits of melamine ,lead and mercury were calculated and the results also obeyed the Beer’s law.The data would provid a beneficial reference in the detection of pesticide residuses and metal ions.

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CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Photochemical analysis ( spectral analysis method)
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