GB/T 31931-2015 标准详情
GB/T 31931-2015
现行
钢板及钢带 锌及锌合金镀层中六价铬含量的测定 二苯碳酰二肼分光光度法
Zinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method