More information about the toxicity of As (or other elements and Arsenic has not been determined to be required forĪny essential biochemical process in humans. ( As sulfide produces a brilliant white light). Arsenic is also used in the manufacture of semiconductors and pyrotechnics

Arsenic's toxic properties have made its compounds useful in medicine for the treatment of syphilis,Ĭancer, and psoriasis. It is a well–known poison and its toxic properties have led to its use in pesticides and insecticides. Some caution, therefore, is advisable in interpreting the significance of these more local features unless some unique sources or processes can clearly be related to them.Īrsenic (As) is a metalloid, meaning this element has properties between those of a typical metal and nonmetal. Distinguishing such random occurrences from true variability is beyond the scope of the data from which these maps are constructed. Numerous more local features might similarly be related to these same factors, but these features also have some probability of being an artifact of a random sampling of variable compositions, so that there is some probability of samples with similar compositions occurring in clusters of two or more adjacent sites by chance. We attempt to distinguish the influence of these various factors on a regional and national scale.

The significant spatial variations shown by most elements and minerals can commonly be attributed to geologic sources in underlying parent materials, but other spatial variations seem clearly related to additional factors such as climate, the age of soils, transported source material, and anthropogenic influences. The purpose of these interpretive discussions is to provide a perspective on regional- and national-scale variations in element and mineral distributions in soils and their likely causes.

Sea Horizon instal the new for apple