Na2S2O5

Hello. This is Oilfield service company Siberia. We are looking for sodium Metabisulfite. Our requirement: sodium Metabisulfite content >=96.5%, Iron content<=0.005%, Arsenic content<=0.0001, pH:4.0-5.0. We need 50 Metric Tons. Can you supply us this product? And what is its price?

Looking forward to your reply!