Fluorescence Spectrometry And Application Of Toxic Elements In The Environment

With the development of world industry and the drastic increase of population, the problem of pollution is becoming more and more serious and is widely concerned by people of all over the world. As an important branch science of environment science, the study and usefulness of environment monitor are considered to a considerable degree by researchers of environment. Chemical monitor and apparatus monitor are the prime means in the monitor of quality of environment, and are used widely in the monitor work of micro-pollutant owing to their advantage of high speed and good accurate. Moreover, one of the main directions of the development of environment analytical chemistry is to improve the sensitivity and selectivity of the analytical method and so is to energetically expand the space to the field of environment science.According to the above objection and the characteristics of fluorescent analysis in itself, we developed a serious of researches in the synthesis of especial effective fluorescent regents and interaction between regents and heavy metals elements. The paper falls into two large parts:First part: because of the strong bonding and steric interference effects characteristric of 2-hydroxy-l-naphthaldehyde and 8-amino-quinoline, which can combine metal ions to decrease the free-rotating of benzene ring and increase the molecular to add the fluorescent intensity of complex evidently, we synthesize a new fluorescent regent, 2-hydroxy-l-naphthaldehydene-8-aminoquinoline (HNAAQ), and studied its properties and established the fluorescent monitoranalytical method of Hg Pb Be in food and sewage.Second part: according to the structure of R-NH-CS-NH-R', which includes atom of N and atom of S that have the strong capacity of complex and can form steady complex between regents and metal ions. To improve the sensitivity of the regent, we must increase the degree of molecular conjugation and the co-planar effect of regent by introducing salicylaldehyde and 2-hydroxy-l-naphthaldehyde at the spot of R when we design its structure, so the fluorescent intensity of the regent are increased remarkably. Under these directions, we synthesize the salicylaldehyde-hydrazinecarbothioamide (SHTA) and2-hydroxy-l-naphthaldehydene-hydrazinecarbothioamide (2-HNHTA), and study their properties and established the fluorescent monitor analytical method of Hg> Cd> Be in food and sewage.