Wikipedia describes arsenic as "the chemical element
that has the symbol As, atomic number 33 and atomic mass 74.92. Arsenic was first
documented by Albertus Magnus in 1250. Arsenic is a notoriously poisonous
metalloid with many allotropic forms, including a yellow (molecular non-metallic)
and several black and grey forms (metalloids). Three metalloidal forms of arsenic,
each with a different crystal structure, are found free in nature (the minerals
arsenic sensu stricto and the much rarer arsenolamprite and pararsenolamprite). However,
it is more commonly found as arsenide and in arsenate compounds, several hundred of
which are known. Arsenic and its compounds are used as pesticides, herbicides,
insecticides and in various alloys."
Although all arsenic test kits in the Arsenic Quick™ line utilize the same EPA/ETV Test Verified chemistry, different
versions of the kit exist to suit the needs of water testers of every sort. Arsenic Quick™ test kits come with
as many as 300 tests and as few as 2. Detection levels for each kit vary as well to account for the wide range of
arsenic levels one might find in water all over the world.