GB/T 22807-2008.Leather and fur- Chemical tests-Determination of chromium VI content. 1范围 GB/T 22807...
GB/T 22807-2019 皮革和毛皮化学试验六价铬含量的测定:分光光度法
GB/T 22807-2019.Leather and fur- Chemical tests- -Determination of chromium ( VI ) content : Colorim...