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    24 October 1983, Volume 4 Issue 5
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    Articles
    CERIUM (Ⅳ) NITRATE COORDINATION COMPOUND CONTAINING A 18-MEMBERED HEXAAZA MACROCYCLIC LIGAND
    Wang Genglin, Zhang Ruohua, Jiang Zonghui
    1983, 4(5):  535-539. 
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    A novel coordination compound of hexadentate nitrogen donor macro-cycle, Ce(NO3)4L3H2O, was obtained by the condensation of 2,6-diace-tyl-pyridine with ethylenedamine using Ce(Ⅳ) as template agent. The properties of spectra, electrical conductance and stability etc. were studied.
    THE MECHANISM OF FORMATION AND CRYSTAL GROWTH OF MOLECULAR SIEVE ZEOLITE(Ⅹ)——THE KINETICS OF CRYSTALS GROWTH OF ZEOLITE NH4ZSM-5
    Han Shuyun, Shi Suhua, Liang Qi, Xu Ruren
    1983, 4(5):  540-544. 
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    By adding seed crystals of the zeolite NH4ZSM-5 the separation o nucleation and growth of NH4ZSM-5 was made to a certain extent. Under the approximately complete growth conditions the law on the growth of the crystals was investigated and it was shown that the growth of the crystals of zeolite NH4 ZSM-5 obeys a kinetic law of the order 2/3. The factors which influence the growth of crystals were examined and the apparent activation energies for growth of the crystals were obtained.The relation of Si/Al ratios of products to Apparent Activation Energies for growth of the crystals was also obtained.
    PREPARATION AND CHARACTERIZATION OF RARE EARTH 4-[(DIPROPYLAMINO)SULFONYL] BENZOATE
    Zeng Zhengzhi, Deng Ruwen, Wu Jigui
    1983, 4(5):  545-548. 
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    In this paper the compounds of rare earths with 4-[(dipropylamino) sulfonyl] benzoic acid have been prepared. They have been characterized as LnA3·nH2O(n= 1 or 2) and CeA4·H2O by chemical analysis, IR absorption spectra, TG and DTA curves, X-ray and conductance studies.
    INVESTIGATION OF THE ELECTROREDUCTION OF CARBON DIOXIDE (Ⅰ)——ELECTROCATALYTIC ACTIVITY OF COBALT PORPHYRIN COORDINATION COMPOUND
    Cao Xizhang, Huang Chubao, Wang Maolian
    1983, 4(5):  549-552. 
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    The catalytic activity of a new soluble metal porphyrin coordination compound, tetrakis- ( p-trimethylammoniophenyl ) porphyrin iodide C56H60N8I4·6H2O(CoTAPPI) in the reduction of carbon dioxide has been investigated by electrochemical method. Experiments revealed that CO2 could be electroreduced in the presence of CoTAPPI. The cathodic voltammogram had a current peak around - 1.5V(vs.SCE). The main product of the reduction was CO.
    STUDIES ON COLOR REACTIONS OF THE POLYCOMPONENT COMPLEXES IN THE SYSTEM OF RARE EARTH ELEMENTS——AMINO-J ACID CHLOROPHOSPHONAZO-TPC-C2H5OH AND ITS APPLICATION IN ANALYTICAL CHEMISTRY
    Li Xinyi, Chen Zhenhua, Zeng Yun'e
    1983, 4(5):  553-556. 
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    Color reactions of rare earths with high sensitivity and selectivity based on the formation of polycomponent complexes in the system of RE-amino-J acid chlorophosphonazo-TPC-C2H5OH have been investigated. In acid medium (0.1-0.3N HCl) in the presence of cationic surface-active agent TPC and ethyl alcohol, amino-J acid chlorophospho-nazo with rare earths reacts to form blue colored complexes.The maximum absorption of the complex of cerium was observed at 695nm. The molor absorptivity of the complex of cerium was 2.01×105 1-1. mol-1. cm-1. Under the same condition, heavier rare earths do not convert to corresponding complexes. The color remains stable for 1 hr. Beer's law is obeyed over the range 0-12 μg/25ml Ce. Many cations and ani-ons do not interfere. The method has been applied to the determination of RE in steel and the results of determination are found to be satisfactory.
    SPECTROPHOTOMETRIC ANALYSIS OF MULTICOMPONENT-MULTISYSTEMS USING DIGITAL COMPUTER
    Gao Jianhua, Deng Yingping, Zhang Maosen
    1983, 4(5):  557-564. 
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    This paper studies the simultaneous analytical method of multicom-ponent mixtures using computer, chiefly discusses the influences of factors which affect the results of analysis, points out the quantitative relationship between these factors and analytical results. An experimentdiscriminant for estimating reliability is summed up. The programs forselecting optimum determinational points and their numbers are made up. This paper discusses the reliability, applicability and limitations of this method and points out its approaches for improvement.
    SIMULTANEOUS SPECTROPHOTOMETRIC OF IRON(Ⅲ) AND TITANIUM(Ⅳ) AND COMPARISON OF SEVERAL VARIATIONS
    Fang Guozhen, Wu Ying
    1983, 4(5):  565-570. 
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    A method for the simultaneous spectrophotometric determination of iron (Ⅲ) and titanium (Ⅳ) in mixtures based on the formation of diantipyrilmethane (DAM) complexes with absorbance maxima of 390 and 460nm has been developed, and its application for their determination in aluminum alloy has been proved to be feasible.In general, photometric determination of iron and titanium in aluminum alloys is separately performed because the presence of one ion interfers with the determination of the other. In addition, although authors have earlier described the individual determination of iron (Ⅲ) and titanium (Ⅳ), no one has hitherto suggested a method of simultaneous spectrophotometric determination of iron ( Ⅲ ) and titanium (Ⅳ) with DAM.In the present paper, the eight variations described (including the solution of simultaneous equations, experimental coefficient method, dualwavelength spectrophotometry, identical molar absorptivity point method, and modified curves method) are all so simple that separations and methods for avoiding the interference of other ions are not necessary, and two ions can be determined with a single operation in the same aliquot.The experimental results showed that the method is applicable for the simultaneous spectrophotometric determination of 10-120μg of titanium and of 10-250μg of iron in aluminum alloys. Such a method generally gave a variation coefficient of 3-5% and a recovery of 90-108%. The method is simple, fast, accurate and reproducible.Future use of the technique is briefly discussed.
    STUDIES ON STRUCTURE, PERFORMANCE AND ITS INITIAL APPLICATION OF A H2 S GAS-SENSING ELECTRODE
    Zhu Yuanbao, Gong Hongzhong, Zeng Zonghui, Zhou Xiaohui
    1983, 4(5):  571-575. 
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    Structure and performance of a H2S gas-sensing electrode and its initial application in printing and dyeing sewage analyses are reported in this paper.The H2S gas-sensing electrode consists of an all-solid state Ag2S membrane indicating electrode and an all-solid state LaF3 reference electrode. The practical linear range of the H2S electrode is within 5×10-8-1×10-2M sulfide solution. The electrode responds to hydrogen sulfide is fast and the reproducibility of measurements is better, Except for higher concentration cyanide, iodide and thiocyanide ion other common anions don't interfere with measurements. If the H2S gas-sensing electrode is used to determine sulfide ion in printing and dyeing sewage (by the addition dilution method), the sample solution does not need any treatment and the electrode will not be contaminated either, because the sensor is hung in air gap over the sample solution. This method is simple, fast, and can be content with requirements of control analyses.
    Preface
    THE STUDIES ON THE CATALYTIC EFFECTS OF THE POLYOXYETHYLENE SURFACTANTS(Ⅲ)——THE SYNTHESIS OF THE SUBSTITUTED CYCLOPENTADIENES
    Rong Guobin, Tao Fenggang, Xu Linxiao
    1983, 4(5):  576-580. 
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    The alkyl substituted derivatives of cyclopentadiene have been synthesized conveniently by the phase transfer catalytic reactions of cyclopentadiene with alkyl halides in the presence of potassium hydroxide and using polyoxyethylene surfactants as catalyst.The reactions were carried out under the solid-liquid two phase systems.The results showed that the ease of the reactions depended upon the reactivity of the alkyl halides.Some alkyl substituted cyclopentadienes were prepared by this method and the polyethylene glycol (PEG)-400 was used as the catalyst.
    Articles
    STUDIES ON THE CONSTITUENTS OF SAUSSUREA INVOLUCRATA KAR. ET KIN. (Ⅰ)
    Jia Zhongjian, Li Yu, Du Mei, Chu Tse-Tsin
    1983, 4(5):  581-584. 
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    Five different crystals have been obtained for the first time from Saussurea involucrata Kar. et Kin. growing in Xinjiang Province. They were identified as: (Ⅰ) Quercetin, (Ⅱ)4', 5, 7-trihydroxy-3', 6-dimethoxy flavone, (Ⅲ)4', 5,7-trihydroxy-6-methoxy flavone (hispi-dulin), (Ⅳ)a compound presumably to be a glycoside and its structure is being studied, (Ⅴ) Rutin.
    SYNTHESIS AND CHARACTERIZATION OF 1, 2-DIMETHYL-3,5-DIPHENYLPYR AZOLIUM SALTS OF PHENOXYCARBOXYLIC ACIDS
    Wang Guilin, Liu Yuanfa, Yang Yunna
    1983, 4(5):  585-588. 
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    Nineteen biological active pyrazolium salts of phenoxycarboxylic acids were reported among which seventeen were first prepared by the authors. A detailed study on experimental conditions had been made and the synthetic procedure was simplified. The structures of these salts have been characterized by elemental analysis and IR spectra.
    THE OXIME-ETHER COMPOUNDS OF PYRETHROID-LIKE
    Huang Runqiu, Chai Youxin, Bi Fuchun, Chen Xueren, Wang Yinshu
    1983, 4(5):  589-594. 
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    The present report deals with the synthesis of a series of pyrethroid-like oxime-ether compounds, their structure characteristic and the relation of structure-biologic activity.Compounds I ( R = h alogen, and R'= #em/em#-propyl or cyclo-propyl ) show high insecticidal activities against Army worms ( Leucania Separata). Their toxicities ( LD50) close to that of Shumizize(S-5602)and surpass that of DDT.The acute oral toxi-city of compound I ( R = Cl, R'=#em/em#-pr) against mice indicated both E-and Z-isomers have LD50>4500mg/Kg. Similar to conventional pyrethro-ids, both isomers did not inhibit choline esterase.
    STUDIES ON THE CHEMICAL CONSTITUENTS OF THE CHINESE MEDICINAL HERB ANEMONE RADDEANA REGEL
    Wu Fenger, Chu Tse-Tsing
    1983, 4(5):  595-599. 
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    The Chinese medicinal herb, Anemone raddeana Regel, has been used for treatment of rheumatism and phlebitis etc. in folk medicine. Eight compounds, numbered 1, 2, R0, R1, R2, R3, R4, R5, have been isolated from this plant.By spectroscopic and chemical methods, 1, 2 and R0 have been identified as follows:1, Diosgenin; 2, Oleanolic acid; R0, 3-O-[α-L-arabinopyranosyl]-oleanolic acid.
    THE APPLICATION OF SCALED PARTICLE THEORY IN KINETIC MEDIUM EFFECTS
    Jin Jiajun, Chen Minsheng, Zhang Chubo
    1983, 4(5):  600-604. 
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    This paper is a theoretical analysis for the medium effects on alkaline hydrolysis of ethyl acetate by the scaled particle theory, according to our own experimental results. The composition of solvent is from 0% to 90% volume percentage of ethyl alcohol aqueous solution or of DMSO aqueous solution, and takes the pure water as the standard solvent. The medium effects are well predicted by the theory. Calculated values of lg(k/k*) are the reaction rate constants and agree with experiment. The term , partial mole intenal free enthalpy in the resulting equation for the rate constants, includs the all interreaction energy of solvent molecules with solute molecules, that are, orientation energy, induction energy and dispersion energy. It will be added by electronic energy when the interreaction is from the polar molecules-ions.
    NMR STUDY ON THE HYDRATION OF IONS IN MICROEMULSION——BIS-2-ETHYLHEXYL PHOSPHORIC ACID-ALCOHOL- KEROSINE-WATER MICROEMULSION SYSTEM
    Wu Jinguang, Gao Hongcheng, Chen Dian, Jin Tianzhu, Xu Guangxian, Sun Xianyu, Zhang Shuizhen, Wu Huaju, Wang Changjin
    1983, 4(5):  605-609. 
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    In the present investigation we have observed the proton shift of water of hydration of metal ions in a microemulsion formed by adding water gradually from 0.05% to 20.0% to a moisture free bis-2-ethylhexyl phosphoric acid-alcohol-kerosine system saponified by metallic sodium, so that the ratio of concentrations (M+)/(H2O) can be varied from 100:1 to 1:100. Under such conditions we have obtained the limits of H2O (M+) for various cations as follows. 6.76ppm (NH4+), 6.60(Li+), 5.96 (Na+), 5.40(K+), while the proton shift of liquid water is H2O = 4.80 ppm. The half widths of NMR peaks in the organophosphoric acid extractant system are much wider than those of naphthenic acid system reported in ( Ⅰ ). This may be explained that the organophosphoric acid anion is also hydrated in addition to the cation.
    STUDIES OF THE SOLID-STATE POLYCONDENSATION OF NYLON-66 SALT WITH CARBON FIBER COMPOSITES
    Zeng Hanmin, Feng Li
    1983, 4(5):  610-616. 
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    The mechanism of the solid-state polycondensation of nylon-66 with carbon fiber composites and effects of the interface between the fiber and matrix were studied by using polarized light microscopy, SEM and thermal analysis methods (DSC,TGA). It was found, that some inter-facial effects such as fiber surface nucleating the crystallization and catalytic effect for the “in situ solid-state polycondensation” of nylon-66 salt were existed. The interfacial effects of the carbon fiber on the epitaxial crystallization and melt behaviour of nylon-66 matrix as well as on the stabilization for thermal oxidation of nylon-66 matrix have been discussed.
    THE INVESTIGATION OF THE SYNTHESIS OF POLYVINYLBENZOIC ACID RESINS (Ⅰ)——SYNTHESIS FROM THE CHLOROMETHYLATED COPOLYMER OF STYRENE-DIVINYL BENZENE BY DIRECT OXIDATION WITH NITRIC ACID
    Ho Ping-lum, Xiao Shaobo, Chen Weichu, Lin Xue
    1983, 4(5):  617-624. 
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    The authors studied the oxidation of macroporous chloromethylated copolymer of styrene-divinylbenzene with nitric acid to macroporous copolymer of vinylbenzoic acid-divinylbenzene (CVBD); thus the weakly cation exchange resins with capacities of 5.0-5.7meq/g(H)were obtained. The effects of the reaction conditions such as the concentration of nitric acid, the temperature and time, were investigated. The reactions of the chloromethylated styrene-divinylbenzene copolymer with dilute nitric acid in the presence of potassium nitrate and surfactants were also investigated. The infrared spectra of the resins proved the composition of the products;it also indicated that the oxidation of the chloromethylated copolymer of styrene-divinylbenzene with concentrated nitric acid first formed an ester as intermediate, i. e. benzyl nitrate, and then to CVBD. The side reaction, i. e. the cleavage of the main chain of the copolymer, was discussed and the degree of decrosslinking of the resins in the reaction was estimated by means of a plot of the swelling against the weight capacity of the resin.
    STUDIES ON THE POLYMERIZATION OF VINYL MONOMERS INITIATED WITH HYDRAZINE HYDRATE
    Cao Weixiao, Chen Guanghua, Feng Xinde
    1983, 4(5):  625-630. 
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    The vinyl monomers, such as methacrylates, have been polymerized with hydrazine hydrate (HZH) as initiator. The rates of polymerization are various with the structure of monomer as well as the polarity of solvent. The overall energy and initiation energy of polymerization for system of MMA-EtOH have been estimated to be 9.05 and 8.31 kcal/mol respectively.From the relationship between the polymerization and oxygen absorption the tentative initiation mechanism has been proposed.
    A STUDY ON TERNARY SYSTEM LaCl3-CH3CONHCONH2-H2O AT 30℃
    Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, Chen Yunsheng
    1983, 4(5):  631-633. 
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    Both the isotherms of solubilities and refraction indices of the system consist of three branches corresponding to the solid phases: LaCl3·7H2O, LaCl3·2CH3 CONHCONH2·5H2O and CH3CONHCONH2. Two eutonics contain LaCl3 and CH3CONHCONH3 47.68%, 8.48% and 41.63%, 15.64%, respectively. The ternary compound is an incongru-ently soluble one. Its density determined as described in the previous work is adout 1.75(17℃). Its photomicrograph is also given in this paper.
    A STUDY ON TERNARY SYSTEM LaCl3-CH3CONHCSNH2-H2O AT 30℃ AND 50℃
    Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, Chen Yunsheng
    1983, 4(5):  634-636. 
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    The solubilities and the refraction indices of the saturated solutions in the titled system have been investigated isothermally. The system at 30℃ and at 50℃ is a simple eutonic one. The solubilities of LaCl3 · 7H2O (one of the solid phases) and CH3CONHCSNH2 (the other solid phase) at 30℃and at 50℃ decrease from 49.32%, 2.20% and 51.68%, 4.71% in pure water to 49.21%, 0.44% and 51.58%, 0.62% in eutonic solutions ( by LaCl3 and CH3CONHCSNH2), respectively.
    DETERMINATION OF RE AND Sc IN THEIR COMPOUNDS WITH DWS METHOD
    Guo Nairong, Luo Qingyao, Chen Zhenhua, Zeng Yun'e
    1983, 4(5):  637-639. 
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    Amino-c acid chlorphosphonazo synthesized in our laboratory reacts with both RE and Sc to form colored complexes. The spectra of these complexes are obviously different in their shapes. This paper demonstrates a DWS method to determine the amount of RE (λ2 = 673.0nm; λ1 = 689.5nm ) and Sc ( λ2 = 626.0nm; λ1 = 656.0nm ) respectively in their compounds. The maximum relative error is 12%. The weight ratio of two oxides are from 1:10 to 10:1.
    HPIEC SEPARATION OF SELENIUM AND TELLURIUM AND THEIR DETERMINATION
    Liu Xiaoyu, Liu Mancang, Hu Zhide
    1983, 4(5):  640-642. 
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    The ion exchange chromatographic behaviour of Se and Te has been investigated under different eluting systems by applying high performance ion exchange chromatography. The complete separation of the elements could be achieved within ten minutes, and good quantitative separating and determining of some samples have been obtained by using the established method.
    A STUDY ON THE THERMOSTABLE STATIONARY PHASES FOR GAS CHROMATOGRAPHY (Ⅱ)——THE USE OF POLYMER PREPARED BY A MIXTURE OF DIMETHYLDICHLOROSILANE,PHENYLTRICHLOROSILANE AND TETRAPHENYLPHENYLTRIETHOXYSILANE AS STATIONARY PHASE
    Yan Changtai, Lu Maosun, Tang Hongmao, Yang Xiaoling
    1983, 4(5):  643-645. 
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    The hydrolysate and prepoiymer of a mixture of dimethyldichorosilane, phenyltrichlorosilane and tetraphenylphenyltriethoxysilane were prepared. They were dissolved in benzene and then coated on the diatoma-ceous supports respectively.The coated support was heat-treated under a stream of nitrogen at 400℃ for 12 hours.The prepared column has been used at a temperature up to 270℃ without bleeding and gave a number of HETP of 1200 plates per metre. A mixture of n-alkanes containing C7 -C30could be well separated by the prepared column with the temperature programmed to 280℃. A mixture of n-alkanols containing C4OH, C6OH, C8OH, C10OH, C12OH, C14OH, C16OH and C18OH has been well separated also when the temperature was programmed to 250℃.n-C16H34 and n-C10OH have been quantitatively determined by the column.The effects of the surface properties of the supports, the weight percentage of the hydrolysate or prepoiymer used in preparing the column and the temperature of heat-treament are discussed.
    DETERMINATION OF BORON IN DIFFICULTLY COMBUSTIBLE HIGH BORON-CONTAINING ORGANIC COMPOUNDS BY OXYGEN-FLASK
    Xie Zhengqiu, Zhao Minghuan, Duan Jiuju
    1983, 4(5):  646-648. 
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    Difficultly combustible high boron-containing organic compounds are quantitatively burnt by adding anhydrous Na3SO3 or Na3SO4 as additive to form Na2B4O7 which is absorbed by dilute acid and transformed into H3BO3. By the present procedure, the formation of B4C can be avoided. This method is suitable for decomposition of many non-volatile B-containing organic compounds.
    SOLID-LIQUID PHASE TRANSFER EQUILIBRIUM OF ONIUM SALTS ( Ⅰ )
    Shen Yusheng, Zheng Luo, Zhao Yingying
    1983, 4(5):  649-651. 
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    The liquid-liquid phase transfer catalysis suffers from two shortcomings: (1) The water molecules coextracted form a hydration shell, which retards the reaction and, sometimes, results in side reactions. (2) It seems to be not applicable for highly hydrophilic anions. For such reactions the solid-liquid phase transfer may be more suitable. But the factors affecting these reactions have not been reported as yet. This paper is the first effort in this area.From the data listed the following conclusions may be obtained:1. The solid-liquid phase transfer is a truely reversible reaction.2. In solvent with higher polarity and/or with higher hydrogen bonddonorability the equilibrium constant increases.3. Decrease of the electron density on the carboxylate group, either by electron withdrawing group or by intramolecular hydrogen bonding, favours the transfer of the carboxylate into solution. The intermolecular hydrogen bonding disfavours it.4. Transfer of salts of divalent anions is negligible or hardly detectable.
    Preface
    AN OPTICALLY ACTIVE IDENTIFICATION REAGENT FOR ALDEHYDES AND KETONES
    Chen Guangxu, Chen Zikang, Liu Guangming
    1983, 4(5):  652-654. 
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    D-Camphorimido-methyl dithiocarbazate (Ⅰ)has been synthesized.It can condense with various aldehydes and keto-nes. Fourteen carbonyl derivatives of ( Ⅰ ) were prepared and their physical constantes have been determined.Except aliphatic aldehydes, most carbonyl compounds give stable crystalline derivatives with sharp melting points and definite specific rotations.Thus ( Ⅰ ) can be used as an optically active identification reagent for aromatic aldehydes, cyclic, aliphatic and aromatic ketones.
    Articles
    POLARIZATION MECHANISM OF CARBON ELECTRODES AND ITS NUMERICAL SOLUTIONS
    Yang Hanxi, Cha Quanxing, Lu Juntao
    1983, 4(5):  655-657. 
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    Based on theory described in an earlier paper (1), numerical methods for calculating the polarization of hydrophobic gas-diffusion electrodes were derived. The effects of electrochemical reactions, liquid and solid phase resistances, concentration change of dissolved reactant and their combined actions could be treated by these methods. Calculated polarization values were found to be in good accordance with measured polarizations of carbon air (oxygen) electrodes.
    THE ESR SPECTRA OF TEMPONE RADICAL ADSORBED ON THE ACTIVATED Al2O3
    Yue shitai, Song Ruifang
    1983, 4(5):  658-660. 
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    The ESR spectra of TEMPONE radical on the activated Al2O3 were studied. It is found out that the ESR spectra of well-resolved nitrogen hyperfine splittings from TEMPONE adsorbed at two distinct types of sites can only be obtained when the Al2O3 must be treated previously with the steam at elevated temperature to increase the adsorbed hydroxyl group on the Al2O3 surface. The nitrogen hyperfine constant AN increases with the increasing of Lewis acid strength.Thus it may be used as a measure of the strength of the surface acid.
    REGRESSION FOR ENERGY PARAMETERS OF WILSON EQUATION
    Hou Jingde, Fang Zhou
    1983, 4(5):  661-663. 
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    Depending on experimental datums, energy parameters of Wilson equation were regressed. Activity coefficients at finite concentrations were calculated.The predictive datums were in good agreement with the ordinary experimental datums reported in literatures.
    INVESTIGATION OF COBALT(Ⅱ) AND ZINC(Ⅱ) SELECTIVE ELECTRODES
    Hui Teng'en, Hang Hu
    1983, 4(5):  664-666. 
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    This paper reports cobalt( Ⅱ ) selective electrode and zinc(Ⅱ) selective electrode made from liquid ion exchange membrane trapped in PVC. The sensors are surface-active agent [C12H25N(CH3)2CH3]Br-tetrathiocyanatocobaltate( Ⅱ ) ion pair and[C12H25N(CH3)2CH3] Br-tetrathiocyanatozincate(Ⅱ) ion pair respectively. The responses correspond to Nernstian relation for cobalt(Ⅱ) selective electrode with the CO2+ concentration rage 10-1-10-4.5 moles, and for zinc(Ⅱ) selective electrode with the Zn2+ concentration range 10-1-10-5 moles. Membrane potentials are independent of pH from 1.3 to 9.1 for cobalt(Ⅱ) selective electrode and from 1.0 to 8.5 for zinc(Ⅱ) selective electrode. The life of cobalt( Ⅱ ) selective electrode is 4 to 6 months while zinc( Ⅱ ) selective electrode is 6 months.
    A MOSSBAUER SPECTROSCOPIC INVESTIGATION OF CORROSION PRODUCTS OF WATER-PIPES OF GEOTHERMAL POWER STATION
    Hong Ruiyu, Zheng Yufang, Fan Jiashi, Wu Jietao, Lu Jingye, Zhang Chengzhou
    1983, 4(5):  667-669. 
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    The corrosion products, inside the branch pipes of geothermal power station in Fengshun of Guangdong, have been studied by absorption Mossbauer spectroscopy.The inlet branch is made of seamless steel tube and the outlet branch is made of cast iron. The corrosion product of the former is γ-FeOOH only, whereas the products of the latter are FeO(60%), Fe3O4 (31%) with small amount of γ-FeOOH(5%) and α-Fe2O3(4%).
    INVESTIGATION OF OXYGEN EVOLUTION REACTION ON NiCo2O4 AND Nd0.8Sr0.2CoO3 ELECTRODES
    Wang Xuelin, Wang Shixun, Xu Guoxian
    1983, 4(5):  670-672. 
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    The oxygen evolution reaction on NiCO2O4 and Nd0.8 Sr0.2 CoO3 have been investigated. Tafel slopes, apparent reaction orders of OH- and apparent activation energies are determined by the steady-state method. Analysis of the transient characteristics of the linear potential swept diagrams is being emphasized. Summing up both the steady-state and transient characteristics, a preliminary mechanism of oxygen evolution reaction on these electrodes is propounded. Computer modeling calculations of this mechanism have been carried out. The results obtained are in fair agreement with the experimental curves.
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