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1990 Volume 7 Issue 2
1990, 7(2): 1-5
Abstract:
Mechanism extraction of Sc(Ⅲ) from hydrochloric acid solution by di(1-methylheptyl) methyl phosphonate (abbreviated as P350) in hoptane has been studied. The composition of the complex was determined to be ScCl-3.3P350 by the metbod of slope. The extraction rea-ction can be expressed as:Sc3++3Cl-+3P350(o)⇌ScCl3·3P35(o) The HCl and H2O were extracted as 3HCl·2H2O·3P350 likely through the reaction:3H+3Cl-2H2O+3P350(o)⇌3HCl·2H2O·3P350(o) The effects of concentration of HCl, extractant and temperatures on the exraction equi-librium were discussed in detail. The equilibrium constant(Kex) and the thermodynamic functions (△H0, △S0, and △G0) of the extraction reaction were calculated.
Mechanism extraction of Sc(Ⅲ) from hydrochloric acid solution by di(1-methylheptyl) methyl phosphonate (abbreviated as P350) in hoptane has been studied. The composition of the complex was determined to be ScCl-3.3P350 by the metbod of slope. The extraction rea-ction can be expressed as:Sc3++3Cl-+3P350(o)⇌ScCl3·3P35(o) The HCl and H2O were extracted as 3HCl·2H2O·3P350 likely through the reaction:3H+3Cl-2H2O+3P350(o)⇌3HCl·2H2O·3P350(o) The effects of concentration of HCl, extractant and temperatures on the exraction equi-librium were discussed in detail. The equilibrium constant(Kex) and the thermodynamic functions (△H0, △S0, and △G0) of the extraction reaction were calculated.
1990, 7(2): 6-9
Abstract:
The adducts of Mn(PMBP)2 (PMBP=1-phenyl-3-methyl-4-benzoyl-pyrazolone-5) with ethanol, 3-methylpyridine, 4-methylpyridine and ethyienediamine have been synthesized and characterized by elemental analysis, molai conductance, magnetic susceptibility, UV IR and EPR spectra measurements.
The adducts of Mn(PMBP)2 (PMBP=1-phenyl-3-methyl-4-benzoyl-pyrazolone-5) with ethanol, 3-methylpyridine, 4-methylpyridine and ethyienediamine have been synthesized and characterized by elemental analysis, molai conductance, magnetic susceptibility, UV IR and EPR spectra measurements.
1990, 7(2): 10-14
Abstract:
REF3(RE=Y、 La、 Ce、 Nd、 Gd、 Tb、 Dy、 Er and Yb) and RE1-xBxF3-y(RE=Y、 La、Ce、Gd and Yb;B=Ca.Sr and Ba) were prepared, and their structure and electric proper-ties were studied. La0.95Ba0.05F3-y and Ce0.95Ca0.05F3-y are solid solutions. Y0.71Ca0.29F3-y and Gd0.85Ca0.15F3-y are new compounds, their lattice parameters have been calcula-ted.The RE1-xBxF3-y showed greater conductivities than REF3. Some of oxygen sensorsmade by RE1-xBxF3-y solid electrolytes could be used promisingly at 150℃.
REF3(RE=Y、 La、 Ce、 Nd、 Gd、 Tb、 Dy、 Er and Yb) and RE1-xBxF3-y(RE=Y、 La、Ce、Gd and Yb;B=Ca.Sr and Ba) were prepared, and their structure and electric proper-ties were studied. La0.95Ba0.05F3-y and Ce0.95Ca0.05F3-y are solid solutions. Y0.71Ca0.29F3-y and Gd0.85Ca0.15F3-y are new compounds, their lattice parameters have been calcula-ted.The RE1-xBxF3-y showed greater conductivities than REF3. Some of oxygen sensorsmade by RE1-xBxF3-y solid electrolytes could be used promisingly at 150℃.
1990, 7(2): 15-19
Abstract:
HDPE-g-PB was synthesized by post-radiation polymerization of butadiene onto HDPE film. Compatibilization of the incompatible blends of poly(cis-1,4-butadiene)/HDPE was brought about by blending HDPE with the graft copolymer HDPE-g-PB. Compatibilization was verified by the facts tbat the glass transition temperature of PB in the blend shifted to 7-9℃ higher and the transition temperature at 263 K shifted to 6-8 K lower; the tensile strength and the elongation at break of PB/PE-g-PB was higher than that of PB/HDPE blend at the same ratio of PB/PE; SEM micrograph showed a more homogeneous phase dis-tribution and a smaller phase size in PB/PE-g-PB blend than in PB/HDPE blend.
HDPE-g-PB was synthesized by post-radiation polymerization of butadiene onto HDPE film. Compatibilization of the incompatible blends of poly(cis-1,4-butadiene)/HDPE was brought about by blending HDPE with the graft copolymer HDPE-g-PB. Compatibilization was verified by the facts tbat the glass transition temperature of PB in the blend shifted to 7-9℃ higher and the transition temperature at 263 K shifted to 6-8 K lower; the tensile strength and the elongation at break of PB/PE-g-PB was higher than that of PB/HDPE blend at the same ratio of PB/PE; SEM micrograph showed a more homogeneous phase dis-tribution and a smaller phase size in PB/PE-g-PB blend than in PB/HDPE blend.
1990, 7(2): 20-24
Abstract:
The effects of aggregated state of nylon-1010 on the chemical reactions (crosslinking and degradation) during gamma irradiation and on the effect induced by heat treatment after irradiation have been studied by using DSC, WAXD, ESR and dielectric spectra, and gel fraction measurement techniques. It is concluded that the chain crosslinking and scission of irradiated nylon-1010 occur mainly in the amorphous region or crystal surface, and the non-crystalline region is also the main district where tbe post-crosslinking and post-degradation occur.
The effects of aggregated state of nylon-1010 on the chemical reactions (crosslinking and degradation) during gamma irradiation and on the effect induced by heat treatment after irradiation have been studied by using DSC, WAXD, ESR and dielectric spectra, and gel fraction measurement techniques. It is concluded that the chain crosslinking and scission of irradiated nylon-1010 occur mainly in the amorphous region or crystal surface, and the non-crystalline region is also the main district where tbe post-crosslinking and post-degradation occur.
1990, 7(2): 25-29
Abstract:
The kinetics of the chlorine evolution reaction on Ti/β-PbO2 electrode has been studied based on the current-potential curves using a rotating disc electrode. The reaction rate affect-ing factors, such as Cl- ion concentration and pH of the solution, have been examined, theb ydrogen ions were found to promote the chlorine evolution reaction. This has been ascribed to the competitive adsorption between H2O molecules and chloride ions at the active sites of the electrode surface. The following parameters were determined:the anodic transfer coeffi-cient, Tafel slope, and the reaction orders with respect to Cl- and H+. From the experimen-tal results the rate determining step of the anodic evolotion of chlorine on Ti/β-PbO2 electrode is found to be MCladi-→MCladi+-e
The kinetics of the chlorine evolution reaction on Ti/β-PbO2 electrode has been studied based on the current-potential curves using a rotating disc electrode. The reaction rate affect-ing factors, such as Cl- ion concentration and pH of the solution, have been examined, theb ydrogen ions were found to promote the chlorine evolution reaction. This has been ascribed to the competitive adsorption between H2O molecules and chloride ions at the active sites of the electrode surface. The following parameters were determined:the anodic transfer coeffi-cient, Tafel slope, and the reaction orders with respect to Cl- and H+. From the experimen-tal results the rate determining step of the anodic evolotion of chlorine on Ti/β-PbO2 electrode is found to be MCladi-→MCladi+-e
1990, 7(2): 30-34
Abstract:
A study has made on the thermal, x-ray diffraction, and dynamic mechanical characterit-tics of polypropylene (pp) (containing 22% ethylene) filled with wollastonite. Different levels of β-form crystallinity were produced in the pp by mixing wollastonite. All the sa-mples filled with wollastonite contain both β and α-forms and four melting transitions were observed instead of two for the unfilled pp. The crystals were found to be changed from β-form to α-form on heating. The relative proportions of β-form present in the specimens was measured from the x-ray diffraction diagram by an empirical ratio K.The K value increases with increasing the con-tent of wollastonite fillers. Wollastonite in the composite is as a reinforecement and nucleator for β-form crystals of pp and it is bound into crystalline phases of pp.
A study has made on the thermal, x-ray diffraction, and dynamic mechanical characterit-tics of polypropylene (pp) (containing 22% ethylene) filled with wollastonite. Different levels of β-form crystallinity were produced in the pp by mixing wollastonite. All the sa-mples filled with wollastonite contain both β and α-forms and four melting transitions were observed instead of two for the unfilled pp. The crystals were found to be changed from β-form to α-form on heating. The relative proportions of β-form present in the specimens was measured from the x-ray diffraction diagram by an empirical ratio K.The K value increases with increasing the con-tent of wollastonite fillers. Wollastonite in the composite is as a reinforecement and nucleator for β-form crystals of pp and it is bound into crystalline phases of pp.
1990, 7(2): 35-39
Abstract:
The crystal structure and miscibility of PP/EPO biends have been investigated by WAXD, TBA and DSC. The degree of crystallinity of PP/EPO blends decreases with increa-sing content of EPO,and the unit cell parameters are independent of the blend composition. Hosemann's treatment was used to separate crystallite size and distortion broadening. The X-ray diffraction profile was corrected by Cauchy and Gaussian functions. Observations made with TBA and DSC indicated that, though immiscibility of PP/EPO blends, there is a partial interfacial miscibility between the two amorphous phases.
The crystal structure and miscibility of PP/EPO biends have been investigated by WAXD, TBA and DSC. The degree of crystallinity of PP/EPO blends decreases with increa-sing content of EPO,and the unit cell parameters are independent of the blend composition. Hosemann's treatment was used to separate crystallite size and distortion broadening. The X-ray diffraction profile was corrected by Cauchy and Gaussian functions. Observations made with TBA and DSC indicated that, though immiscibility of PP/EPO blends, there is a partial interfacial miscibility between the two amorphous phases.
1990, 7(2): 40-44
Abstract:
A series of AB crosslinked polymers (ABCPs) based on poly(hexamethylene adipate)-polyurethane(PHAPU) and methyl methacrylate(MMA) with various compositions were pre-pared by means of ultra-violet initiation polymerization. The values of crosslink density were determined by swelling equilibrum approach and rubberlike elasticity. The both results were in good agreement. The width of tangent δ peak at the half height was more than 60℃,and the system was considered to be mechanically compatible.By simply varing the concentration of the constituents, a series of damping materials, With a unique set of properties, could be obtained.
A series of AB crosslinked polymers (ABCPs) based on poly(hexamethylene adipate)-polyurethane(PHAPU) and methyl methacrylate(MMA) with various compositions were pre-pared by means of ultra-violet initiation polymerization. The values of crosslink density were determined by swelling equilibrum approach and rubberlike elasticity. The both results were in good agreement. The width of tangent δ peak at the half height was more than 60℃,and the system was considered to be mechanically compatible.By simply varing the concentration of the constituents, a series of damping materials, With a unique set of properties, could be obtained.
1990, 7(2): 45-48
Abstract:
Palladium-nickel bimetallic catalysts supported on poly-(4,7-diazaheptyl)siloxane were prepared. XFS analysis indicated that the complexation occurred between nitrogen atom of the polymer and Pd0, PdCl2 or NiCl2. The hydrogenation activity of the catalyst for decene-1, cyclohexene, propenoic acid, styrene and nitrobenzene has been investigated. The result indicated that the bimetallic catalyst showed higher activity in the hydrogenation of styrene and nitrobenzene. The activity of the bimetaliic catalyst was affected by the Pd/Ni atom ratio and temperature.
Palladium-nickel bimetallic catalysts supported on poly-(4,7-diazaheptyl)siloxane were prepared. XFS analysis indicated that the complexation occurred between nitrogen atom of the polymer and Pd0, PdCl2 or NiCl2. The hydrogenation activity of the catalyst for decene-1, cyclohexene, propenoic acid, styrene and nitrobenzene has been investigated. The result indicated that the bimetallic catalyst showed higher activity in the hydrogenation of styrene and nitrobenzene. The activity of the bimetaliic catalyst was affected by the Pd/Ni atom ratio and temperature.
1990, 7(2): 49-53
Abstract:
The microstructure of α-iPP films prepared by solution-casting on glycerol and crystal-lized at different temperature was investigated by means of defocused electron microscopy and electron diffraction techniques. Microscopic observation showed that all the samples consis-ted of two kinds of structures:cross-hatched and single-crystal-type structure, independent of crystallization temperature. In the cross-hatched structure, as a result of epitaxial cry-stallization, there existed wide-angle and low-angle branchings of lamellae seen edge-on. The characteristics of the former branching were accounted for by the way of epitaxial gro-wth of daughter lamellae on the lateral face(010) of parent lamellae substrate, while the later was explained in this paper by the theory of branching of individual dominant lamel-lae proposed by Bassett and Olley.
The microstructure of α-iPP films prepared by solution-casting on glycerol and crystal-lized at different temperature was investigated by means of defocused electron microscopy and electron diffraction techniques. Microscopic observation showed that all the samples consis-ted of two kinds of structures:cross-hatched and single-crystal-type structure, independent of crystallization temperature. In the cross-hatched structure, as a result of epitaxial cry-stallization, there existed wide-angle and low-angle branchings of lamellae seen edge-on. The characteristics of the former branching were accounted for by the way of epitaxial gro-wth of daughter lamellae on the lateral face(010) of parent lamellae substrate, while the later was explained in this paper by the theory of branching of individual dominant lamel-lae proposed by Bassett and Olley.
1990, 7(2): 54-56
Abstract:
The oxidation of 2 by I2-KIO3-AcOH-H2O system has been studied. Instead of 3, the cisglycol(C22S, C23S) was obtained in yield of 78.5%, as the major product obtained in the oxidation of 2 by osmium tetroxide. The possible mechanism,of the oxidation reaction was discussed.
The oxidation of 2 by I2-KIO3-AcOH-H2O system has been studied. Instead of 3, the cisglycol(C22S, C23S) was obtained in yield of 78.5%, as the major product obtained in the oxidation of 2 by osmium tetroxide. The possible mechanism,of the oxidation reaction was discussed.
1990, 7(2): 57-59
Abstract:
The synthesis of title compound(2) is reported. The keystep is the synthesis of 3-phen-oxy-4-fluorotenzaldehyde(3). p-Toluidine has been used as starting material. The biological tests indicated that the title compound has a higher insecticidal activity to mosquitoes(larvae), houseflies and German cockroaches.
The synthesis of title compound(2) is reported. The keystep is the synthesis of 3-phen-oxy-4-fluorotenzaldehyde(3). p-Toluidine has been used as starting material. The biological tests indicated that the title compound has a higher insecticidal activity to mosquitoes(larvae), houseflies and German cockroaches.
1990, 7(2): 60-61
Abstract:
A convenient procedure for the isomerization of α-pinene to β-pinene is described.In the reaction of α-pinene with triethylammino borine as well as with triethyl-benzylammonium borane bis-3-pinanylborane was obtained. The latter was isomerized to bis-10-pinanylborane which gave β-pinene in the presence of dipentene on heating. The yields of β-pinene were 89.1% and 81.9%,respectively.
A convenient procedure for the isomerization of α-pinene to β-pinene is described.In the reaction of α-pinene with triethylammino borine as well as with triethyl-benzylammonium borane bis-3-pinanylborane was obtained. The latter was isomerized to bis-10-pinanylborane which gave β-pinene in the presence of dipentene on heating. The yields of β-pinene were 89.1% and 81.9%,respectively.
1990, 7(2): 62-64
Abstract:
Extraction of HPdCl4- and PtCl62- with trialkyl benzyl ammonium chloride (7407) from hydrochloric acid medium has been studied. On the basis of the influences of tempera-ture and concentration of 7407 upon the distribution ratio Dpd and Dpt, the extraction equi-librium constants and some thermodynamic functions at 30℃ were obtained:Kpd=2.92×104, Kpt=1.44×106;△Hpd=-8.37kJ/mol, △Hpt=-24.5kJ/mol;△Gpd=-25.9kJ/mol, △Gpt=-35.7kJ/mol;△Spd=57.8J/mol·K, △Spt=37.0J/mol·K.
Extraction of HPdCl4- and PtCl62- with trialkyl benzyl ammonium chloride (7407) from hydrochloric acid medium has been studied. On the basis of the influences of tempera-ture and concentration of 7407 upon the distribution ratio Dpd and Dpt, the extraction equi-librium constants and some thermodynamic functions at 30℃ were obtained:Kpd=2.92×104, Kpt=1.44×106;△Hpd=-8.37kJ/mol, △Hpt=-24.5kJ/mol;△Gpd=-25.9kJ/mol, △Gpt=-35.7kJ/mol;△Spd=57.8J/mol·K, △Spt=37.0J/mol·K.
1990, 7(2): 65-68
Abstract:
Thermal decomposition of the title compounds (L=NO-, CN-, NO2-, N3-) in helium and vacuum has been studied by gas chromatography and quadrupole mass spectrometry. The result shows that the substitute ligand released prior to cyano group and the order of the decomposition temperature of substituted ligands is NO- < N3- < NO2- < CN-. Appearance of potassiun cyanocobaltate(Ⅲ) in decomposition products shows a rearlan-gement occured among solid. compounds during the decomposition reaction.
Thermal decomposition of the title compounds (L=NO-, CN-, NO2-, N3-) in helium and vacuum has been studied by gas chromatography and quadrupole mass spectrometry. The result shows that the substitute ligand released prior to cyano group and the order of the decomposition temperature of substituted ligands is NO- < N3- < NO2- < CN-. Appearance of potassiun cyanocobaltate(Ⅲ) in decomposition products shows a rearlan-gement occured among solid. compounds during the decomposition reaction.
1990, 7(2): 69-70
Abstract:
Polyethylene glycol(PEG) is used as a phase transfer catalyst in the bromo-hydroxylation of styrene.Experimental results showed that the yield of β-blomo-α-hydroxyethylbenzene and the reaction rate are enhanced by addition of PEG into the system, and the effect increased remarkably with the increasing amount of sulfuric acid. The maximum, yield of β-bromo-α-hydroxyethylbenzen is 92%. A possible mechanism is proposed.
Polyethylene glycol(PEG) is used as a phase transfer catalyst in the bromo-hydroxylation of styrene.Experimental results showed that the yield of β-blomo-α-hydroxyethylbenzene and the reaction rate are enhanced by addition of PEG into the system, and the effect increased remarkably with the increasing amount of sulfuric acid. The maximum, yield of β-bromo-α-hydroxyethylbenzen is 92%. A possible mechanism is proposed.
1990, 7(2): 71-73
Abstract:
Based on the reaction of chromind(Ⅵ) with thiamine hydrochloride a simple, sensitive method for the fluorimetric deteamination of chromium is developed. The fluoresent species has an excitation and emission maxima at 405nm and 465nm respectively. The sensitivity of the determination of chromium is 1×10-6mol/L. The method has been applied to determine chromium in wast water and cast iron satisfactorily.
Based on the reaction of chromind(Ⅵ) with thiamine hydrochloride a simple, sensitive method for the fluorimetric deteamination of chromium is developed. The fluoresent species has an excitation and emission maxima at 405nm and 465nm respectively. The sensitivity of the determination of chromium is 1×10-6mol/L. The method has been applied to determine chromium in wast water and cast iron satisfactorily.
1990, 7(2): 74-76
Abstract:
This paper deals with the electrochemical stability of the embedded powder clectrode of tungsten carbide (WC) catalyst. The results show that in acidic electrolytes WC exhibits a good electrochemical stability to hydrogen ionization reaction (HIR) and no oxide was formed on the electrode surface if the potential was less than 800 mv (vs. D H E). In basic electrolyte in parallel with hydrogen ionization reaction WC. itself undergoes electrochemical oxidation. Thus WC catalyst cannot be used in basic electrolyte medium.
This paper deals with the electrochemical stability of the embedded powder clectrode of tungsten carbide (WC) catalyst. The results show that in acidic electrolytes WC exhibits a good electrochemical stability to hydrogen ionization reaction (HIR) and no oxide was formed on the electrode surface if the potential was less than 800 mv (vs. D H E). In basic electrolyte in parallel with hydrogen ionization reaction WC. itself undergoes electrochemical oxidation. Thus WC catalyst cannot be used in basic electrolyte medium.
1990, 7(2): 77-79
Abstract:
The ternary complexes of rare earth salicylate (Sal) with 2,2'-bipyridine-N,N'-dioxide(biPyO2) having composition RE(biPyO2) (Sal)3 (for RE=La, Ce) and RE(biPyO2) (Sal)2Cl(for RE=Pr, Nd, Sm, Eu) were prepared. The complexes have been characterized by in-frared spectrometry,thermogravimetry, differential scanning calorimetry and fluorescent spec-troghotometry.
The ternary complexes of rare earth salicylate (Sal) with 2,2'-bipyridine-N,N'-dioxide(biPyO2) having composition RE(biPyO2) (Sal)3 (for RE=La, Ce) and RE(biPyO2) (Sal)2Cl(for RE=Pr, Nd, Sm, Eu) were prepared. The complexes have been characterized by in-frared spectrometry,thermogravimetry, differential scanning calorimetry and fluorescent spec-troghotometry.
1990, 7(2): 80-82
Abstract:
A series of lanthanide (except Ce,Pm,Lu) complexes of rose bengal were prepared in alcohol:water(2:3) solution. The composition of these complexes have been ascertained by elemental analysis. Some properties, such as IR spectra, UV spectra, electric conductivities,TG curves and solubilities in different solvents were measured.
A series of lanthanide (except Ce,Pm,Lu) complexes of rose bengal were prepared in alcohol:water(2:3) solution. The composition of these complexes have been ascertained by elemental analysis. Some properties, such as IR spectra, UV spectra, electric conductivities,TG curves and solubilities in different solvents were measured.
1990, 7(2): 83-85
Abstract:
Various tipe of alkenes can be simply prepared in high yield from primary, secondary and tertiary alcohols, using solid superacid POSA (C8F17SO3H, perfluorooctanesulfonic acid) as a catalyst. The catalyst can be reused many times without any loss of its activity.
Various tipe of alkenes can be simply prepared in high yield from primary, secondary and tertiary alcohols, using solid superacid POSA (C8F17SO3H, perfluorooctanesulfonic acid) as a catalyst. The catalyst can be reused many times without any loss of its activity.
1990, 7(2): 86-88
Abstract:
p-(N,N-Dimethylamino) benzylidene malononitrile (DMABM) was used as a Photochemi-cal probe for monitoring the rapid photocrosslinking processes in scme photosensitive polymer coating on the basis of the sensitive photoresponse of DMABM photophysical properties to the environment of reaction media.The results showed that this flourenscence probe techniqueis sensitive and convenient.
p-(N,N-Dimethylamino) benzylidene malononitrile (DMABM) was used as a Photochemi-cal probe for monitoring the rapid photocrosslinking processes in scme photosensitive polymer coating on the basis of the sensitive photoresponse of DMABM photophysical properties to the environment of reaction media.The results showed that this flourenscence probe techniqueis sensitive and convenient.
1990, 7(2): 89-91
Abstract:
The radiation crosslinking of LDPE/1,2-PBd blend has been studied. The experimental results show that the relationship R(S+√S)=1/q0U1+p0lRβ/q0 is also suitable to LDPE/1,2-PBd blend system. The method to calculate the βb value of polymer blend system has been established.
The radiation crosslinking of LDPE/1,2-PBd blend has been studied. The experimental results show that the relationship R(S+√S)=1/q0U1+p0lRβ/q0 is also suitable to LDPE/1,2-PBd blend system. The method to calculate the βb value of polymer blend system has been established.
1990, 7(2): 92-94
Abstract:
Ultrafine powders of hydroxides and oxides of thirteen rare earths have been prapared by alcoxide method. The size of the powder particle was less than 0.05μm by TEM observa-tion. The powders obtained from Jight rare earths are different in shapes from those from heavy rare earths and are easier to be dispersed. XRD determination showed that the ultra-fine powders of some rare earth hydroxides are crystalline, while the powders of the oxides are all crystalline.
Ultrafine powders of hydroxides and oxides of thirteen rare earths have been prapared by alcoxide method. The size of the powder particle was less than 0.05μm by TEM observa-tion. The powders obtained from Jight rare earths are different in shapes from those from heavy rare earths and are easier to be dispersed. XRD determination showed that the ultra-fine powders of some rare earth hydroxides are crystalline, while the powders of the oxides are all crystalline.
1990, 7(2): 95-97
Abstract:
As a supplement to previous work this paper deals with the extraction of Fe(Ⅱ) from nitrate solution with P538 at 30℃ in various diluents: toluene, benzene, hexane, cyclohe-xane, kerosene, methylene chloride and carbon tetrachloride. The relationship between the distribution ratio D and solubility parameter δ of diluent was found as:lgD=-0.653+0.294δ-0.026δ2 at hi gher loading lgD=1.741-0.250δ+0.0083δ2
As a supplement to previous work this paper deals with the extraction of Fe(Ⅱ) from nitrate solution with P538 at 30℃ in various diluents: toluene, benzene, hexane, cyclohe-xane, kerosene, methylene chloride and carbon tetrachloride. The relationship between the distribution ratio D and solubility parameter δ of diluent was found as:lgD=-0.653+0.294δ-0.026δ2 at hi gher loading lgD=1.741-0.250δ+0.0083δ2
