Interrelation Research on Three Kinds of Trace Element Copper,Zinc and Manganese in Cereal of the Different Incidence Areas of the Esophagus Cancer

With the development of modern biology and medical science,we have had enough evidence to prove some kinds of trace element(TE) have vital effect on the human body's physiology function, metabolism,heredity and so on. And the effect can directly relate to people's daily food. This paper determined copper, zinc, and manganese levels in cereal of the different incidence areas of the Esophagus cancer by atomic absorption spectrophotometry. In order to probe into the interrelation between TE and the esophagus cancer, the analytical results had been statistically done and listed in Table.     

Advance in Microwave-assisted Digestion Techniques

Since 1975 when Abu-samra first reported the use of microwave as a heat source for wet digestion methods, sample preparation techniques have ushered in a new era. Using this technique, not only has the sample matrix been decomposed completely, but also digestion times have been dramatically reduced with other benefits such as little contamination, less reagent and sample usage, reduction in loss of volatile species and low blank values. In this paper, some developments in microwave-assisted digestion (MAD) are presented.     

Introduction of a New Devices for Sampling Organic Pollutants

A new mimic biological sampling devices, which consisted of lipid-containing semipermeable-membrane (SPMD) for sampling organic pollutants has been introduced.     

三个新茂钛催化剂的合成及苯乙烯间规聚合

合成了三个新茂钛催化剂:茂基三呋喃甲氧基钛,茂基三(四氢呋喃甲氧基)钛,茂基三苄氧基钛,其结构均经元素分析、^1HNMR、^1^3CNMR、IR及MS确证。它们与甲基铝氧烷(MAO)组成的催化体系对苯乙烯间规均聚合有良好的催化活性。     

二(α-肟基丙酸根)合铜(Ⅱ)的固相合成、表征及热分解

Bis(2-hydroxyiminopropanoato) copper (Ⅱ) (［Cu(PAO)₂］·2H₂O) was synthesized by one step solid reaction between Cu(Ac)₂·H₂O and 2-hydroxyimino propanoic acid (HPAO) at 50℃. The complex was characterized by element     

Synthesis and Characterization of a New Neutral Ionophore for Use in Bulk Optode

Chemical sensors based on optical signal detection are of increasing importance. Optical sensors of bulk optodes have the advantage of being robust and showing a highly reversible response explainable by means of the chemical equilibria involved. Therefore, a great number of new ion-selective bulk optodes have reported within a few years. Several sensors for detecting toxicologically revalant ions,such as Pb²⁺,Ag⁺,Hg²⁺ and UO₂²⁺ have been developed recently and exhibit the low detection limit required. Although a number of ionophores have been used in optodes and ISEs,the sensors described so far are inadequate for monitoring Ag⁺ in water, especially in drinking water because of their limited selectivity and/or insufficient sensitivity. More recently Pretsch et al designed and synthesized an improved optical sensor, methylene bis(2-thiobenzothiazole),which was Ag⁺-selective. Here we report synthesis of another ionophore,1,2-bis(2-thiobenzothiazole) ethane, and its IR, ESI-MS, ¹HNMR and UV-Vis.     

Simultaneous Determination and Pharmacokinetics of Magnolol and Honokiol in Body Fluid and Tissue of Wistar Rat by A Reversed Phase High Performance Liquid Chromatography

A reversed phase high performance liquid chromatography method for simultaneous determined magnolol and honokiol in serum and urine of rat were builted.     

Data Acquisition and Transfer System for In-situ Atomic Emission Spectroscopic Analysis

A new method of data acquisition,proceeding and data share is introduced and a data acquisition and transfer system targeting in-situ spectroscopic analysis in metallurgy is established. This system is designed for the critical control of steelmaking, which greatly requires rapid and suitable information feedback. The information includes analysis data, measurement data and controls. The analysis data are acquired from the serial port of the computer-aided spectrometers or other devices and are identified, converted and then stored to the standard database in a network server. The network is based on the Intranet structure and works on the Windows NT operation system. It supports remote access and Internet connection so that the analysis data can be shared,proceeded and developed by certified personnel throughout the network. A set of specially designed data transfer devices with display panel are used in the severe places to display real-time analysis data and other information, which are offered from the nearest workstation on the network. These devices are dust-proofed and anti-magnetic. Each device offers up to 30 terminals with the limited distance of 3000 meters at 2400 baud-rates under the industrial condition. The application program for the data proceeding is integrated to the system. It includes system security, data acquisition, data transfer, data process and display. It also includes auxiliary functions such as operation help, system's resources monitoring and other customer-defined parameters. The software's functions directly related to the system are detailed discussed. Associated with another management and control software programmed for this system,the critical control of steelmaking can be approached.     

Determination of Conjugated Dienes in Petroleum Products by Ultraviolet Spectrophotometry

The paper is based on the method of determination of conjugated dienes in petroleum products by the combined method of chemical reaction with gas chromatography.