There is always sci-finder for this kind of stuff.
Where did you find those articles? Were those form peer-rewieved yournals or from internet? This might be the reason why they were not found adequate.
Try this one
Arsenic toxicity and potential mechanisms of action
Michael F Hughes
Toxicology Letters
Volume 133, Issue 1, 7 July 2002, Pages 1–16
Read it carefuly and then, continue to the articles quoted in this review and you will find one which has experimental part in it.
I dont get it to be honest. Chemistry today is linked together with other fields - biology, medicine, materials.. so saying it cant be biological means, that you will find any articles at all, because "arsenic posioning" is directly linked with biology and there is no other way.