COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION
The equilibrium cocrystallization coefficients D M/CoSO4.7H2O of low amounts (10-3- 10-1%w/w) of M2+ ions (M2+ = {Ni2+, Mg2+, Cu2+, Zn2+, Fe2+, Mn2+, Cd2+, Ca2+}) with CoSO(4)7H2O have been determined with the method of long-time stirring of crushed CoSO(4)7H2O crystals in their saturated solution a...
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Sociedad Chilena de Química
2003
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oai:scielo:S0717-970720030003000022004-01-30COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATIONSmolik,MarekThe equilibrium cocrystallization coefficients D M/CoSO4.7H2O of low amounts (10-3- 10-1%w/w) of M2+ ions (M2+ = {Ni2+, Mg2+, Cu2+, Zn2+, Fe2+, Mn2+, Cd2+, Ca2+}) with CoSO(4)7H2O have been determined with the method of long-time stirring of crushed CoSO(4)7H2O crystals in their saturated solution at 20ºC and compared with coefficients determined by means of the method of isothermal decreasing of supersaturation during 3 360 hours of stirring. This enabled the time needed to reach equilibrium to be found. It is different for different microcomponents. The determined cocrystallization coefficients are diverse: from <0.008 for Ca2+ to 1.20 for Fe2+. Their dependence on some physicochemical and crystal-chemical properties of both sulfate hydrates (CoSO(4)7H2O and MSO4nH2O) and metal M2+ ions has been discussed. They depend mainly on solubility in water and structure of corresponding sulfate hydrates as well as on radii of M2+ ions. It is possible to calculate cocrystallization coefficients with empirical formula based on determined relationships between some of the considered properties of macrocomponent and microcomponents and D M/CoSO4.7H2O coefficients at the average relative error not exceeding 10%info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.48 n.3 20032003-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000300002en10.4067/S0717-97072003000300002 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| description |
The equilibrium cocrystallization coefficients D M/CoSO4.7H2O of low amounts (10-3- 10-1%w/w) of M2+ ions (M2+ = {Ni2+, Mg2+, Cu2+, Zn2+, Fe2+, Mn2+, Cd2+, Ca2+}) with CoSO(4)7H2O have been determined with the method of long-time stirring of crushed CoSO(4)7H2O crystals in their saturated solution at 20ºC and compared with coefficients determined by means of the method of isothermal decreasing of supersaturation during 3 360 hours of stirring. This enabled the time needed to reach equilibrium to be found. It is different for different microcomponents. The determined cocrystallization coefficients are diverse: from <0.008 for Ca2+ to 1.20 for Fe2+. Their dependence on some physicochemical and crystal-chemical properties of both sulfate hydrates (CoSO(4)7H2O and MSO4nH2O) and metal M2+ ions has been discussed. They depend mainly on solubility in water and structure of corresponding sulfate hydrates as well as on radii of M2+ ions. It is possible to calculate cocrystallization coefficients with empirical formula based on determined relationships between some of the considered properties of macrocomponent and microcomponents and D M/CoSO4.7H2O coefficients at the average relative error not exceeding 10% |
| author |
Smolik,Marek |
| spellingShingle |
Smolik,Marek COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| author_facet |
Smolik,Marek |
| author_sort |
Smolik,Marek |
| title |
COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| title_short |
COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| title_full |
COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| title_fullStr |
COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| title_full_unstemmed |
COCRYSTALLIZATION OF LOW AMMOUNTS OF M2+ IONS DURING CoSO(4)7H2O CRYSTALLIZATION |
| title_sort |
cocrystallization of low ammounts of m2+ ions during coso(4)7h2o crystallization |
| publisher |
Sociedad Chilena de Química |
| publishDate |
2003 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072003000300002 |
| work_keys_str_mv |
AT smolikmarek cocrystallizationoflowammountsofm2ionsduringcoso47h2ocrystallization |
| _version_ |
1718445326485946368 |