Methods for chemical analysis of limestone and dolornite—Part 12:Determination of potassium oxide and sodium oxide contents—Flame atomic absorption spectrometry method
Zinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide (diphenylcarbazide) spectrophotometric method
Methods for chemical analysis of limestone and dolornite一Part 10:Determination of titanium dioxide content一Diantipyrylmethane spectrophotometric method