Column: element
Description: the element of the toxicology 
Data format: text
Value description:  cl: chlorine
 c: carbon
 h: hydrogen
 o: oxygen
 s: sulfur
 n: nitrogen
 p: phosphorus
 na: sodium
 br: bromine
 f: fluorine
 i: iodine
 sn: Tin
 pb: lead
 te: tellurium
 ca: Calcium