Selenium (Se) & selenium compounds

Selenium is a nonmetalic element found in a variety of chemical forms in both marine and freshwaters. Selenate (Se VI) and selenite (Se IV), the common inorganic forms in natural waters. Selenium is required in trace amounts by organisms ranging from bacteria to phytoplankton to mammals. (ref. ID; 1268)

[Se; an atomic absorption standards solution 1,000 ug Se per ml (nominal) in 1% HNO3)]
Test organisms;
Rotifera: Brachionus calyciflorus (ref. ID; 127)

[[75]Se(IV)]
Test organisms;
Green algae (formerly including protozoa): Chlamydomonas reinhardtii (ref. ID; 4995)

[Selenium Oxide]
Test organisms;
Nematoda: Panagrellus redivivus (ref. ID; 868)

[Selenium Dioxide] CAS[7446-08-4] UN3283
Test organisms;
Protozoa: Colpidium campylum (ref. ID; 6081)

[NaHSeO3]
Chemical formula; NaHSeO3
Test organisms;
Oligochaeta: Tubifex tubifex (ref. ID; 6968)

[Sodium Selenate] CAS[13410-01-0] UN2630
Chemical formula; Na2SeO4
Test organisms;
Protozoa: Paramecium putrinum (ref. ID; 1268)

[Sodium Selenite] CAS[10102-18-8] UN2630
Chemical formula; Na2SeO3
Test organisms;
Protozoa: Paramecium putrinum (ref. ID; 1268)