GB/T 4702.3-2016 Determination of the content of chromium and phosphorus in metals Bismuth phosphorus molybdenum blue spectrophotometric method (English Version)
2017GB/T 4702.3-2016 Determination of the content of chromium and phosphorus in metals Bismuth phosphorus molybdenum blue spectrophotometric method
1984GB/T 4702.3-1984 Methods for chemical analysis of chromium metal--The molybdenum blue photometric method for the determination of phosphorus content