CODA-CERVA is the Belgian National Reference laboratory (NRL) for the determination of trace elements in food and animal feed.

Nonoccupational sources of exposure to mercury include food (methylmercury compounds, mainly in aquatic organisms) and dental amalgam fillings (metallic mercury). These exposure levels are usually lower than those typically detected in occupational settings. 

NORMS AND LEGISLATION :

Maximum levels for mercury in foodstuffs

http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2008:173:0006:0009:FR:PDF
Regulation (EC) No 1881/2006 setting maximum levels for certain contaminants in foodstuffs.

Maximum mercury content in products intended for animal feed

http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CONSLEG:2002L0032:20060224:FR:PDF
DIRECTIVE 2002/32/EC of the European Parliament and of the Council of 7 May 2002 on undesirable substances in animal feed.

Tolerable human intake levels

Mercury: Provisional Tolerable Weekly Intake (PTWI): 5 µg/kg body weight

Methylmercury: PTWI 1.6 µg/kg body weight
FAO/WHO, 2003: Summary and conclusions of the sixty-first meeting of the Joint FAO (Food and Agriculture Organization of the United Nations)/WHO (World Health Organization) Expert Committee on Food Additives (JECFA), Rome, 10-19 June 2003; JECFA/61/SC
and
FAO/WHO, 2006: Summary and conclusions of the sixty-seventh meeting of the Joint FAO/WHO Expert Committee on Food Additives (JECFA), 20-29 June 2006; JECFA 67/SC