1 ml of this standard solution contains 0,1 µg of Cr(VI). For the preparation of comparison solution, add 1 ml of phosphoric acid and 1 ml of diphenylcarbazide solution to 50 ml of standard Cr(VI) solution, 标液中六价铬含量为0.1ug/ml 取50ml显色 Cut a test piece measuring about 50 mm × 50 mm from the coated item and remove any sealing, such as paint or wax, etc., by scraping the surface. 取试样25cm2，萃取，定容50ml，显色 与标液比较 那么，0.1ug/ml*50ml对应25cm2 不就是0.2ug/cm2
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