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: +86-22-66208570