Standards for Mercury

Various laws in Japan regulate and set standards for mercury. The following is a list of relevant, domestic standards:

Types of Standards	Total Hg	Alkyl mercury compounds
Standards for disposal of domestic wastes and industrial wastes in landfill site (leachate-controlled type)	＜0.005mg/L	Not to be detected
Standards for discharge of effluent from final landfill site:
a. Hg in effluent b. Hg in surrounding groundwater	＜0.005mg/L ＜0.0005mg/L	Not to be detected Not to be detected
Standards for atmospheric emission ^*1	Not set	Not set
Standards for working environment	＜0.025mg/m3 ^*2	＜0.01mg/m3 ^*3

*1 Nomura Kohsan has set a voluntary standard of 0.04mg/m3N
*2 Excluding mercuric sulfide (HgS).
*3 Limited to ethyl and methyl compounds.