Our company supply agriculture the zinc sulfate (zinc sulfate monohydrate or zinc sulfate heptahydrate).The product specifications as following:
zinc sulfate monohydrate
Main content:98%
                Zn:35%
                Pb:10PPM
                As:5PPM
                Cd:10ppm

zinc sulfate heptahydrate
Main content:96%
                 Zn:21.5%
                 Pb:10PPM
                 As:5PPM
                 Cd:10ppm
above specifications are for export standard, if you think the specifications do not meet your requirement, please contact with me. We can supply the specification what you want.

Looking forward to your inquire.

Best wishes,

Jiang Tao
Unitechem Co., Ltd
company address: A-2-504 GUOXIN BULD 2ND STREET TEDA TIANJIN CHINA.
MSN: www_123@hotmail.com
TEL: +86-22-66208570
Fax: +86-22-66218311