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.
Arsenic acid and arsenious acid are the forms that are normally found in water â though they may lose some of their H+ atoms depending on the pH. 1  pH is the scale that measures how acidic a solution is. 2  Solutions with a low pH (less than 7, which is neutral) are acidic. 3  Solutions with a high pH are basic.