Safe drinking water in Mexico: a project by EWB-UCL » Arsenic Arsen_1a.jpg Small silvery arsenic sample in glass tube. This entry was posted on Wednesday, January 27th, 2016 at 5:43 pm and is filed under . You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed. Leave a Reply Name (required) Mail (will not be published) (required)