Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
Equilibriums of the Quinary Reciprocal System Na, K, Mg Cl, SO4-H2O
Masao MOTOYAMAMinoru KADOTAShumpei OKA
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1971 Volume 24 Issue 5 Pages 189-196

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Abstract

The authors investigated data related to the solubility of oceanic salts containing NaCl mainlym Chemical Abstracts published from 1940 to 1970. As the result, they made out four newbles; namely, three four-component systems, Na, Mg Cl, SO4-H2O, Na, K Cl, SO4-H2O and Na, Mg Cl-H2O and a five-component system, Na, K, Mg Cl, SO4-H2O. These tables represent thempositions of liquid phases and the kinds of solid phases on the mono-variant points saturatedth NaCl.
The authors made out of these data polythermic equilibrium diagrams within the temperaturege of 50°C to 110°C, partially modifying the diagrams shown in the classical work of D'Ans.
It was confirmed that the point of Y, at which four solid phases, namely, NaCl, loeweite (Na2SO4·MgSO4·5/2H2O), langbeinite (K2SO4·2MgSO4) and kieserite (MgSO4·H2O) coexist, existed evenat 110°C, and the composition of liquid phase was extrapolated, namely, Na2Cl2 23.9, K2Cl2 11.1, MgCl2 32.0 and MgSO4 11.5 moles per 1000 moles of H2O.

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