Supplier Page from Aladdin Scientific Corporation for 2,3',4,4',5-Pentachlorobiphenyl Standard Solution
β-Endosulfan Standard from Aladdin Scientific Corporation
1-Nonadecene [Standard Material for GC] from Aladdin Scientific Corporation
Four anions mixed standard(Fluorine, Chlorine, Nitrate Nitrogen and Sulfate) from Aladdin Scientific Corporation
Water quality permanganate index standard from Aladdin Scientific Corporation