what is the mechanism of urea based precipitation of copper nitrate?

Answer 1

http://books.google.com/books?id=Yb38DM1IoAsC&pg=PA476&lpg=PA476&dq=urea+precipitation+copper+nitrate&source=bl&ots=BPmPmnTGQO&sig=YR8JYWEaHHcj4LUpAXCq0Qw0BR0&hl=en&ei=VaVuTePbOcK78gbGy4ztDg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCYQ6AEwAg#v=onepage&q=urea%20precipitation%20copper%20nitrate&f=false

Answer 2

https://books.google.com/books?id=Yb38DM1IoAsC&pg=PA476&lpg=PA476&dq=urea+precipitation+copper+nitrate&source=bl&ots=BPmPmnTGQO&sig=YR8JYWEaHHcj4LUpAXCq0Qw0BR0&hl=en&ei=VaVuTePbOcK78gbGy4ztDg&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCYQ6AEwAg#v=onepage&q=urea%20precipitation%20copper%20nitrate&f=false