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Commission Directive 2008/84/EC (repealed)Show full title

Commission Directive 2008/84/EC of 27 August 2008 laying down specific purity criteria on food additives other than colours and sweeteners (Text with EEA relevance) (Codified version) (repealed)

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E 558 BENTONITE

DefinitionBentonite is a natural clay containing a high proportion of montmorillonite, a native hydrated aluminium silicate in which some aluminium and silicon atoms were naturally replaced by other atoms such as magnesium and iron. Calcium and sodium ions are trapped between the mineral layers. There are four common types of bentonite: natural sodium bentonite, natural calcium bentonite, sodium-activated bentonite and acid-activated bentonite
Einecs215-108-5
Chemical formula(Al, Mg)8(Si4O10) 4(OH)8 · 12H2O
Molecular weight819
AssayMontmorillonite content not less than 80 %
DescriptionVery fine, yellowish or greyish white powder or granules. The structure of bentonite allows it to absorb water in its structure and on its external surface (swelling properties)
Identification
A.Methylene blue test
B.X-Ray diffraction
Characteristic peaks at 12,5/15 A
C.IR absorption
Peaks at 428/470/530/1 110-1 020/3 750 — 3 400 cm-1
Purity
Loss on dryingNot more than 15,0 % (105 oC, 2h)
ArsenicNot more than 2 mg/kg
LeadNot more than 20 mg/kg

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