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中文
Table of Content
24 May 1989, Volume 10 Issue 5
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Articles
Synthesis of Dithymidinodiamineplatinum(Ⅱ) and Determination of Equilibrium Constant of Diamineplatinum (Ⅱ) to Thymidine
Dong Yanhong, Tang Wenxia, Dai Anbang
1989, 10(5): 441-446.
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Dithymidinodiamineplatinum( 22 ) was synthesized in aqueous solution at pH=9.0 by gradual neutralization approach and purified by means of sepha-dex G-10 column. The final product was characterized by elemental analysis, TG, DTAand
13
C NMRmethods.
Preparation and Structure Characteristic of Dealuminized Mordenites
Zhang Honglang, Li Quanzhi, Hu Jiafen, Zhong Ailian
1989, 10(5): 447-452.
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The dealuminized mordenites with SiO
2
/Al
2
O
3
in the range from 16 to 186 were prepared by the method of steam with acid leaching. Their structure characteristic was studied by X-ray diffraction and IR. The lattice parameters exhibit a nonlinearity and a pronounced anisotropy with the degree of dealumination. Since parameter "a" is obviously contracted, it makes the long axis of elliptical main channel of mordenite contracted.The vibration frequencies of zeolite framework at 600-1300cm
-1
shifted to higher frequencies with dealumination. As Al/u.c. was changed from 4 to 3, the obvious change of the structure charactetistic occurred with the dealumination , it is probably related to the removal of the aluminum atoms of position "2" from the framework. When Al/u.c.≤3, the new Si-O-Si framework was formed and it was rearranged to a more orderly structure.
Studies on Organo-Phosphorus, -Arsenic and -Antimony Polytungstates and Polymolybdates (Ⅲ) —Preparation and Characterization of New Ortho-, Meta-, Para-Nitropheny I arsenic Polymolybdates
Liu Benyao, Gu Yidong(Yih-tong Ku)
1989, 10(5): 453-457.
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In order to investigate the types of compounds of arylarsenic polymo-lybdates, we have prepared ortho-, meta-, para-nitrophenylarsenic acids and tested the reactions of these acids with sodium molybdate at pH3～5. Five new salts of arylarsenic polymolybdates have been synthesized and characterized, (a) (CN
3
H
6
)
5
[(o-NO
2
C
6
H
4
As)
2
Mo
6
O
25
H]·H
2
O, (6) Cs
5
[(o-NO
2
C
6
H
4
As)
2
Mo
6
O
25
H], (c) (CN
3
H
6
)
5
[(m-NO
2
C
6
H
4
As)
2
Mo
6
O
25
H]·4H
2
O, (d) (CN
3
H
6
)
5
[(p-NO
2
C
6
H
4
As)
2
Mo
6
O
25
H]·4H
2
O, (e) Cs
5
[(p-NO
2
C
6
H
4
As)
2
Mo
6
O
25
H].We thus find that different positions of nitro group on benzene ring have little influence on the complex type thus formed.They all belong to [(RAs)
2
Mo
6
O
25
H]
5-
type, which is different from the [(RAs)
2
Mo
6
O
24
]4- type reported by Kwak et al, but is the same as its phenyl derivative type [(RAs)
2
Mo
6
O
25
H]
5-
and also the same as its tungsten congener type [(RAs)
2
W
6
O
25
H]
5-
reported by Wasfi et al,The infrared spectra, ultraviolet spectra and cyclic voltammograms of all these salts have been reported. The infrared spectroscopic and electrochemical anomaly of ortho-nitrophenylarsenic polymolybdates has been discussed .
Studies on New Inorganic Ion Exchangers Containing Phosphorous(Ⅶ)—Ion Exchange Mechanism and Selectivities of metal ions on SSPP
Yao Xingdong, Liu Liangbin, Liu Jinchun, Cheng Jieke
1989, 10(5): 458-461.
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The mechanism of ion exchange reaction of metal ions on Stannic selenopyrophosphate (SSPP) and the characteristics of exchange reactions on SSPPwere studied by means of the determination of surface ion exchange capacities and IR, Reflection Spectra and ESR. The mechanism was applied to explaining the selectivity sequences of ions on the exchanger.
The Study on the Spectrofluorometric Determination of Microamounts of Palladium(Ⅱ) with Food Colour Tartrazine
Wen Zhiming, Wang Huaigong
1989, 10(5): 462-465.
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Anew highly sensitive and selective method has been developed for the spectrofluorometric determination of palladium( Ⅱ) with food colour Tartra-zine(TTZ) by heating them under a boiling water bath in a given time(20-60 min). It was found that the palladium (Ⅱ) might form a stable brown complex with TTZin HCl-NaAc buffer solution in the range of pH 2.6-4.0. The maximium excitation and emission wavelengths of complex are 528nm and 558nm. The composition of the complex is Pd( Ⅱ) :TTZ = 1:2. Its apparent stability constant(K) and molor absorptivity at the excitation wavelength(ε
ex
) are 0.7× 10
11
and 1.45× 10
4
L/mol.cm respectively. The quantum yield(Φ) is 0.011.By this method, Pd( Ⅱ ) can be determinated in the range of 0～12μg/25 mL. The limit of determination is 4 × 10
-3
μg/mL. The effect of deverse ions on the determination was also investigated. Asimple and rapid method was proposed for direct determination of Pd(Ⅱ ) in synthetic sample and in mineral without preseparation.
Fourier Transform Smoothing of Experimental Data of Neopolarography
Wang Yaoguang, Liu Jianhua
1989, 10(5): 466-470.
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Anew algorithm which performs Fourier transform smoothing has been presented and applied to data of staircase voltammetry. The establishment of this method is mainly based on the cordensation procedure of the smoothing principle,on the periodicity of trigonometric functions and on the simplified method of evaluating sines and cosines with the formula for summation of angles. The practical effect of Fourier transform smoothing Las been compared with that of least-squares-polynomial-fit smoothing.lt maybe seen that Fourier transform smoothing is particularly powerful in the processing of experimental data of neopolarography.
Studies on Acylthiosemicarbazides and Related Heterocyclic Compounds (Ⅹ)— Cyclization of
1
-(4'-Pyridinoyl)-4-Aroylthio- Semicarbazide Derivatives
Zhang Ziyi, Feng Xiaoming, Chen Limin, Meng Qianxiang, Gao Dongzhe
1989, 10(5): 471-476.
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In this work, a series of new 3-(4' -pyridinoyl)-4-aroyl<-1,2,4-tria-zoline-5-thibne( Ⅱ ) have been synthesized by the cyclization of 1-(4' -pyridinoyl)-4-aroylthiosemicarbazides( Ⅰ ) under the catalysis of alkaline medium in good yields. Having studied the reaction of ( Ⅰ ), we found that in all cases when 4-position substituent of aroyl group in compounds( Ⅰ ) was electron-withdrawing group such as NO
2
,halogen and others, or electron-donating group such as Me, MeOand others,3-(4'-pyridinoyl)-4-aroyl-1,2,4-triazoline-5-thione (Ⅱ) could be obtained. The structures of all compounds prepared were characterized by elemental analysis, IRand
1
H NMR. The cyclic orientation of compounds( Ⅰ ) has been comfirmed by the detailed analysis of the fragmentation in mass spectrometry for compounds (Ⅱ ).Preliminary pharmacological examinations show that the new compounds( Ⅱ ) exhibit less antitubercular activity than corresponding parent compounds ( Ⅰ ) except that 3-(4' -pyridinoyl)-4-(2' -fluorine-phenyl)-1, 2, 4-triazoline-5-thione which has a little inhibiting activity.
Study on 5-Phenyl-2-(5' -Phenyl Oxazol-2'-yl)-1,3,4-Oxadiazole and Its 5-p-Substituted Phenyl Derivatives
Kao Chenheng, Zhao Aihua, Wang Mingzhen
1989, 10(5): 477-481.
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The synthesis, UVand FLspectra, substituent effects as well as laser conversion efficiencies of 5-phenyl-2-(5' -phenyl-oxazol-2'-yl)-1, 3,4-oxadiazole and eleven of its 5-para-substituted phenyl derivatives are reported in this paper. The solvent effects on the electronic spectra of two of these compounds in eleven solvents are discussed. All of the oxazolyl oxadiazoles are new compounds.
Studies on the Synthesis, Characterization and Mbssbauer Spectrometry of Substituted Ferrocene Polyiodides
Qi Showen, Wang Yiju, Wang Xukun, Jiao Yongsheng, Miao Zhongshan, Li Jinshan
1989, 10(5): 482-485.
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A Series of new substituted ferrocene polyiodides with general formula of [(RC
5
H
4
)(R'C
5
H
4
)Fe]I
x
were synthesized.The elemental analysis showed that substituted ferrocenes with Et, Ac, and ph as Rand R' groups give polyiodides with integer ratios for ferrocene to iodine while ferrocenes with MeCH (OH) substituents give polyiodides with non-integer ratios for ferrocene to iodine. The
57
Fe Mossbauer study indicated the oxidation of ferrocenes in these polyiodides to [FcH]
+
cations with reduced ISvalues compared to the original-ferrocenes and much reduced (even reached to zero) QSvalues. The IRspectra of these polyiodides also show the presence of [FcH]
+
type cations with the characteristic absorptions at 400～500cm
-1
(multiplet), the shift of 800-850cm
-1
(strong) and characteristic absorptions for substituents to higher wave-numbers.
Studies on the Physical Structure and Surface Properties of Adsorbents—Effect of Acid-Treatment on Structure and Adsorption Properties of Silica Gels
Shen Zhong
1989, 10(5): 486-490.
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Na Silicate and H
2
SO
4
are reacted to produce acidic silicic acid hydro-gel. If the hydrogel is washed with acidifying tap water at pH 3, the product is typical fine-pored silica gel with av. pore radius (r)7.5～8.2Å, specific surface area (S)637-690m
2
/g and pore volume (V) 0.26mL/g. After the impregnation of acidic hydrogel with H
2
SO
4
solutions of various concentrations for 24 h (and then dried at once), the specific surface area and apparent density decreased with increasing the concentration of the acid used, but the pore volume, av. pore radius and av. particle diameter increased with increasing the concentration of the acid used. When the concentration is sufficiently high (3-l8mol/L), the pore structure and adsorption properties of the resulting silica gel are similar, all of these products are extremely coarse-pored silica gels (r= 292-300Å, S-98m
2
/g, V= 1.43-1.47ml/g). On the other hand, if the same hydrogel is impregnated with HC1 solutions of various concentrations, the relationship between pore structure of silica gel and concetration of the acid used is roughly similar to that as mentioned above.In the concentration range of 3-16mol/L, the properties of the resulting silica gel are almost consistent, but they are not typical coarse-pored silica gels (r=53Å, S = 270m
2
/g, V = 0.71-0.72mL/g).
Optically and Thermally Stimulated Luminescence of BaF Cl:Tb Crystals
Lin Jianhua, Su Mianzeng
1989, 10(5): 491-494.
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The mechanisms for the optically and thermally stimulated luminescence of BaFCl
t
Tb crystal are proposed. As being X-irradiated the doped trivalent terbium ion may trap a hole and be oxidized to the tetravalent state. Meanwhile the existing chloride vacancy V(Cl) in the crystal may trap an electron and is converted into a F-center. In the processes of optically and thermally stimulated luminescence the tetravalent terbium ion may capture an electron ionized from the F-(tenter and then may be reduced to the excited state of Tb
3+
, from which the characteristic emission of Tb
3+
5
D
4
-
7
F, transition takes place.
The Construction for Symmetry Orbitals
Zhao Ming
1989, 10(5): 495-500.
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Anew method for building up symmetry orbitals is presented on the bases of the rotational property of ligand orbitals and the representation matrices for point group generators. The relationship between the symmetry coefficients together with the calculation of group overlap integrals is discussed in detail.
Catalysis of Zeolites in Dehydrative Amination of Ethanol with Ammonia
Hu Ying, Jiang Dazhen, Lu Huijuan, Dai Jizhou, Fan Shuguang
1989, 10(5): 501-505.
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The dehydrative amination of ethyl alcohol with ammonia was studied over some zeolites at a temperature of 300-400℃ under ambient pressures. Infrared spectrometry and temperature programmed desorption have been used to characterize the acidic properties of zeolites. It is found that the formation of diethylamine(DEA) and triethylamine(TEA) were suppressed with reducing the dimensions of pore openings and channels of zeolites; proton or alkali-metal ion-exchanged ZSM-5 show considerable shape-selectivity. Besides, the conversion of ethanol have been found to be dependent on the amount of surface acid sites on zeolites. The Lewis acid sites on zeolites perhaps are major active sites for the dehydrative amination reaction. The Bronsted acid sites on zeolites seems to favour the by-reaction.
Polymerization of Methyl Methacrylate Initiated by Peroxydicarbonate and N,N-dihydroxyalkyl -p-toluidine Systems
Qiu Kunyuan, Fu Jie
1989, 10(5): 506-510.
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The polymerization of methyl methacrylatc (MMA) initiated by bis-2-phenoxyethyl peroxydicarbonate (BPPD) and N, N-di-2-hydroxyethyl-p-toluidine (DHET), N, N-di-2-hydroxypropyl-p-toluidine(DHPT), N,N-dimethyl-p-toluidine(DMT), N,N-dimethyl aniline(DMA) binary systems has been studied. The polymerization rate R
P
and overall activation energy E
3
of polymerization were determined respectively. It was found that the order of R
P
for initiation systems was BPPD-DHET≈BPPD-DHPT>BPPD-DMT, while the order of E
g
was reversed. The rate equations for MMApolymerization in toluene solution were also determined. An initiation mechanism was proposed based on the results of ESRstudies and end group analysis.
The Crystallization Behaviour of Poly(Styrene- CO-Sodium Acrylate) Modified Poly- (Ethylene Terephthalate)
Wang Tiejun, Yang Changzheng, Dai Qingping
1989, 10(5): 511-514.
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The miscibility and crystallization behaviour of blends of poly (ethylenc terephthalate) with poly(styrene-co-sodium acrylate) (ST-SA) were investigated by using DSCand FT-IRtechniques. The ionomer ST-SAwas found to have both nucleating and blending effects on PET. Not only the ionomer accelerated the crystallization of PET, but also improved the miscibility, forming a partial miscible two-phase system in the amorphous phase, Crystallinity data from both DSCand FT-IRmeasurements showed that the crystallinity of PETwas almost not affected by blending of the poly (styrene-co-sodium acrylate) at the equilibrium state. Avrami plot indicated that the secondary crystallization increased with the increase of the content of poly (styrene-co-sodium acrylate) in comparison with pure PET.
Electron Beam Induced Graft Copolymerization of Styrene onto PVA Non-Woven Fabrics
Lu Yun, Tang Liyuan, Zeng Hanmin, Zhu Yongliang, Zhao Zizhi, Wen Ping
1989, 10(5): 515-519.
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In this paper the graft copolymerization of styrene onto PVAnon-vvoven fabrics induced with electron beam produced by electron electrostatic accelerator has been systematically investigated. The factors which influence the percentage grafting and efficiency of graft are discussed, they are the kinds of organic solvents, concentraction of monomer, reaction temperature and time, and added amount of Mor's salt, etc.
Self-Diffusion Coefficients of Polymer in Polymerization Measured with Pulsed Field-Gradient NMR Spin Echo Methods
Hu Jian, Xu Yushu, Xu Jing, Jiang Dianwu, Chui Haifeng
1989, 10(5): 520-521.
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Aexperiment set for measuring self-diffusion coefficients of polymer in polymerization with a pulsed Field-Gredient NMR Spin Echo method is described. The self-diffusio coefficients produced from little molecules in polymerization from MMAto PMMAinitiated by AIBNwere measured with this set. The lowest value of the coefficients is D= 9.04 × 10
-9
cm
2
·s
-1
.
The Cobalt(Ⅱ) Complexes of Bis(n-octylsulfinyl)-ethane
Zhang Ruohua, Zhang Qiuwen. Zhang Zijing
1989, 10(5): 522-524.
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Four cobalt( Ⅱ ) complexes of bis(n-octylsulfinyl)ethane have been perpared. These complexes have been characterized by elemental analysis, molar conductance, visible near-infrared, infrared spectra and molar susceptibility. They have the following formula [Co(α-BOSE)
3
](ClO
4
)
2
, [Co
2
(β-BOSE)
5
(ClO
4
)
2
](ClO
4
)<
2
·4H
2
O,[Co(α-BOSE)
2
(NO
3
)
2
],[Co(β-BOSE)(NO
3
)·H
2
O]NO
3
.The ligand field parameters of complexes and other data are also shown.
Studies on the Rare Earth Coordination Compounds(Ⅶ)—Synthesis and Characterization of Coordination Compounds of Rare Earth Element swith
1
,6-Bis(1'-phenyl-3'-methyl-5' -pyrazolone-4' -)-1,6-hexanedione
Wan YanHui, Dong Wenji, Li Xiaojing, Chen Rong, Yang Rudong
1989, 10(5): 525-527.
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Fourteen solid coordination compounds of title compound(BPMPHD) with rare earths were synthesized from aqueous ethonal solution. Elemental analysis agree with proposed stoichiometric RE
2
A
3
.4H
2
O (where RE = Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb. A = C
26
H
24
N
4
O
4
2-
). The compounds were characterized by UV, IR, molar conductance, fluorescence spectra and thermoanalysis. The dinuclear structures of these complexes were confirmed by X-ray powder diffraction.
Polarographic Studies of Erythromycin Estolate and Its Application
Hu Yinhua, Zhang Yonghui, Xing Xiaofang
1989, 10(5): 528-530.
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Asingle-sweep polarographic method is first presented here for the quantitative analysis of erythromycin estolate(I). Using 4 raol/L H
2
SO
4
as the supporting electrolyte, the peak potential is -0.57 V(vs SCE). Alinear dependence between the concentration and the peak height is observed over the 0.05～10μg/mLrange with the correlation coefficient 0.9984. The adsorptive character of Iat Hg electrode is discussed. Applicability of the title method to direct measurement of Iin tablets and serum is assessed.
Study on the Separation of Rh-Ir and Simultaneous Determination of Rh-Ir-Pt-Pd Using AP Chelate Resin
Li Lingying, Chen Lanhui, Ma Jinqiu
1989, 10(5): 531-533.
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Separation of Rh-Ir which has not been completely dissolved is one of the most difficf.lt problem in analytical chemistry. In this paper, we have found the favourable conditions under which base metals-Rh-Ir can be better separated on APchelate resin and the appropriate eluant for simultaneous elution of Rh-Ir-Pt-Pd followed by ICP-AES. It must be mentioned that only the ion form of [RhCl
5
(H
2
O)]
2-
can be retained on the APresin column and separated from base metals in the solution.
Precolumn Chelation High Performance Liquid Chromatography Determination of Super- Trace Fe(Ⅱ),Co(Ⅱ ),Fe( Ⅲ)
Zhao Yi, Fu Chengguang
1989, 10(5): 534-536.
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This paper describes the separation of Fe( Ⅱ ),Co(Ⅱ ) and Fe( Ⅲ ) chelates with 5-C
1
-PADABon C
18
bonded stationary phase by RP-Liquid Chro-matography with methanol-water as mobile phase. Heavy-elements such as Fe(Ⅱ), Co(Ⅱ ) and Fe( Ⅲ ) were determined by this chromatographic system. The retention of the chelates depends on central metal ions, mcthanol-water ratio, pHvalue of the mobile plase and concentration of NaH
2
PO
4
in mobile phase. The chelates of Fe( Ⅱ ),Co(Ⅱ ),Fe(Ⅲ) at part billion levels were separated within 10 min by using 5μm Nucleosil C
18
column(250 × 4mm I.D) with methanol(65)-water(35 containning 2.0g/L NaH
2
PO
4
) as the mobile phase with pH 2.5. The detection limits of Fe( Ⅱ ), Co( Ⅱ) and Fe( Ⅲ) are 4 × 10
-11
g,4 × 10
-11
g and 2×10
-11
g respectively.
Study on the Determination of Sulfide by Indirect Method
Zhang Hanqi, Li Shujuan, Zhang Xiaoxi, Jin Qinhan(Q. Jin)
1989, 10(5): 537-539.
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An indirect method for the determination of sulfide was developed. The method is based on the cold mercury vapor atomic absorption spectrometry (CMVAAS). Sulfide(S
2-
) was first transformed into mercury sulfide precipitation by reacting with mercury ion(Hg
2+
) in an aqueous solution and then was determined indirectly by measuring mercury content in the precipitate by CMVAAS. It was shown that the method is sensitive and quite specific. The method has been conveniently employed to determine sulfide in natural water.
Syntheses of endo or exo-5,5-Disubstituted-3-Oxo- 4-Oxatricyclo[5,2,1,0
2,6
]8-Decenes
Wang Xiaolan, Tang Shixiong, Jiang Lasheng, Wang Changfeng, Cao Yurong
1989, 10(5): 540-542.
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Eleven endo- and five e.xo-5,5-disubstituted-3-oxo-4-oxatricycIo-[5,2,1,0
2,6
]-8-decenes were synthesized by the reaction of the corresponding cyclic anhydrides with Grignard reagents. Fourteen of these compounds are new. Their IRand
1
H NMRspectra were measured. The
1
H NMRspectra were discussed briefly.
Studies on the Structures and Reactions of 4-Fluoro-3-hydroxyl-1 -substituted Phenyl-6-pyridazinones
Yuan Bin, Lin Chengji, Tian Guanrong
1989, 10(5): 543-545.
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The structures of 4-fluoro-3-hydroxy-l-phenyl and substituted phenyl-6-pyridazinones and their reactions with ethereal solution of diazome-thane were investigated. The methylation of this kind of pyridazinones indicates that the yield of O-CH
3
derivatives is higher than that of N-CH
3
. Compound Ⅳ and Ⅵ exhibit a strong herbicidal effect, on barnyard grass, alisma orientalis etc. in rice-fields.
Synthesis and
1
HNMR Spectra of Substituted Cyclopentadienes
Liu Yulong, Chen Shoushan
1989, 10(5): 546-548.
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A Series of substituted cyclopentadienes, namely, C
5
H
5
RR'Ar,R = CH
3
, R' = CH
3
, C
2
H
5
, C
3
H
2
, CH
2
CH(CH
3
)
2
, R = R' =C
2
H
5
; R = R' = (CH
2
)
5
; Ar = C
6
H
5
, p-, m-, o-CH
3
C
6
H
4
, .p-,o-CH
3
OC
6
H
4
were prepared by the reaction of 6,6-dialkylfulvenes with aryllithium followed by treatment with water. For the steric effect of o-tolyl and o-methoxyphenyl, the chemical shifts of alkyl protons at 6-position in o-substituted phenyl cyclopentadienes split to two groups of signals.
Stereochemistry in Cyclophosphorylation of Nucleosides
Xu Cheng, Zhang Lihe
1989, 10(5): 549-550.
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2'-O-Tosyladenosine( Ⅰ ) was treated with n-C
4
H
9
OP(N(C
2
H
5
)
2
)
2
in the presence of tetrazole to give n-butyl 2' -O-tosyladenosine 3', 5'-cyclo-phosphite (Ⅱ
a
).The reaction occurred stereospecifically, and only one diastere-omer was obtained. When this reaction was carried out in the absence of tetrazole, the diastereomers Ⅱ
a
and Ⅱ
b
were isolated in a ratio of 4:1.
A Study on the Process of Cathodic Reduction of Chromium (Ⅲ) Ions
Jiang Lincai, Jian Subi
1989, 10(5): 551-553.
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The reductions of Chromium (Ⅲ) ions at HMDEhave been studied in the solutions of Na
2
SO
4
,NaCl and NaCNS. It is shown that the irreversibi-lity of the reaction varies with the nature of ligand anions. The irreversibility of the reaction in the solution of Na
2
SO
4
is the most obvious while the presence of Cl
-
and CNS
-
reduces it and makes the reaction much faster and the difference of peak potential much smaller as well. It is confirmed by RRDEexperiments that the species formed at the first wave of the reduction of Cr
3+
are Cr
2+
ions which can be reduced to metal chromium at more negative potential. Thus, the process can be written asCr
3+
+e=Cr
2+
, Cr
2+
+2e=Cr The standard rate constant determined by using chronocoulometric method for the reduction reaction of Cr
3+
ions in the solutions of 0.5 mol/L NaCl at HMDEis 3.0 × 10
-5
cm·s
-1
and the diffusion coefficient of Cr
3+
ions in the same solution is 2.7×10
-6
cm
2
s
-1
.
Thin-Layer Electrolytic Cell Determination of Copper by Flow Injection Method
Zhu Yuanbao, Huang Shaosheng, Long Youqian, Liu Huiyan, Zeng Lisun
1989, 10(5): 554-556.
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The construction and characteristics of a thin-layer electrolytic cell with graphite glass as working electrode are presented. In the medium of NH
4
Cl-NH
3
H
2
O, the peak current is proportional to the concentration of copper from 10
-6
mol/Lto 10
-2
mol/L(1 .27 ×10
-5
～1.27 ×10
-9
g Cu) at a voltage of -0.30V. The correlation coefficient is 0.99. During the determinationt the charging current and poison of mercury do not exist, and oxygen must in the solution must not be removed. The method has been applied to determination of copper in aluminium alloy and in the steel.
The Effect of Magnetic Field on Passivation of Iron and Nickel in Sulfuric Acid Solution
Xu Songlin, Cai Jiale, Zhou Shaomin
1989, 10(5): 557-559.
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The anodic passivation behaviors of iron and nickel in sulfuric acid solution under the influence of magnetic field have been studied. The increase of passivation current density and the positive shift of passivation potential with the enhancement of magnetic field can be attributed to magneto-hydrodynamic effect and iRchange of solution respectively. The mechanism of passivation is discussed.
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