Heavy metal. In Japan, pesticides including mercury can not use.
Mercury is widespread in the environment since it originates from natural sources, the burning of fossil fuels, industry and the use of fungicides. (ref. ID; 4583)

[Hg: atomic absorption standards solution]
Test organisms;
Rotifera: Brachionus calyciflorus (ref. ID; 127)
Rotifera: Brachionus plicatilis (ref. ID; 1321)

[Mercuric(II) Chloride] CAS[7487-94-7] UN1624
Chemical formula; HgCl2
Chemical characteristics; water soluble
Test organisms;
Protozoa: Acanthamoeba castellanii (ref. ID; 946)
Protozoa: Aspidisca cicada (ref. ID; 6011)
Protozoa: Blepharisma americanum (ref. ID; 6011)
Protozoa: Colpidium campylum (ref. ID; 6081, 6011)
Protozoa: Euplotes affinis (ref. ID; 6011)
Protozoa: Euplotes patella (ref. ID; 6011)
Protozoa: Paramecium caudatum (ref. ID; 6011)
Protozoa: Spirostomum teres (ref. ID; 6838)
Protozoa: Tetrahymena pyriformis (ref. ID; 615, 979)
Protozoa: Uronema nigricans (ref. ID; 6011)
Protozoa: Soil protozoa and bacteria (ref. ID; 4583)
Rotifera: Brachionus calyciflorus (ref. ID; 4957, 6108)
Rotifera: Brachionus patulus (ref. ID; 6771)
Rotifera: Lecane hamata (ref. ID; 6861)
Rotifera: Lecane luna (ref. ID; 6861)
Rotifera: Lecane quadridentata (ref. ID; 6861)
Oligochaeta: Dendrobaena octaedra (ref. ID; 6928)
Oligochaeta: Tubifex tubifex (ref. ID; 1318, 6079, 6080, 6968)
Nematoda: Aphelenchus avenae (ref. ID; 2011)
Nematoda: Caenorhabditis elegans (ref. ID; 495, 506, 2165, 6824, 6854)