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Table 1 Content of ions and double salts in recrystallized efflorescence from Aspaas House

From: Salt efflorescence in historic wooden buildings

Ion Ion content, mg g−1 Possible sulfate salts Metal salt content, mg g−1
Sulfate (\({\text{SO}}_{4}^{{2 - }}\)) 440.9   
Ammonium (\({\text{NH}}_{4}^{{+}}\)) 48.0   
Zinc (Zn2+) 26.6 (NH4)2Zn(SO4)2·6H2O 163.1
Aluminum (Al3+) 21.3 NH4Al(SO4)2·12H2O 192.1
KAl(SO4)2·12H2O 172.7
Magnesium (Mg2+) 17.3 (NH4)2Mg(SO4)2·6H2O 256.0
Potassium (K+) 14.2 See Aluminum entry
Iron (Fe2+) 13.7 (NH4)2Fe(SO4)2·6H2O 92.6
Sodium (Na+) 7.4 Na2SO4·10H2O 103.9
Calcium (Ca2+) 4.6 CaSO4·2H2O 19.6
    Sum 1025.7