St. Helens Chronicle. The St. Helens woman has been missing for two weeks. Her boyfriend, currently in the Lane County jail for other offenses, is now considered a person of interest. Police are currently searching for St. Helens woman, Cheryl Hart, who has been missing for nearly two weeks.
First, there are typically two varieties, or species, of arsenic in water: arsenic 3 and arsenic 5.. This is significant because arsenic 3 is very difficult to remove from water and must be changed or oxidized to arsenic 5 before it can be removed.
More commonly, it bondswith various elements such as oxygen, sulfur, andchlorine to form inorganic arsenic compoundsand with carbon and hydrogen to form organicarsenic compounds. The water-soluble trivalentand pentavalent oxidation states of inorganic ar-senic are the most toxic arsenic compounds.