This part of GB/Work 20975 specifies the determination of iron content in aluminum and aluminum alloys by phenanthroline spectrophotometry and potassium dichromate titration. This section applies to the arbitration determination of iron content in aluminum and aluminum alloys. The determination range of phenanthroline spectrophotometry: 0.001 to 3.50%; the determination range of potassium dichromate titration method: 3.50 to 65.00%.
GB/T 20975.4-2020 Referenced Document
GB/T 20975.4 Methods for chemical analysis of aluminium and aluminium alloys—Part 4:Determination of iron content
GB/T 8005.2 Terms of aluminium and aluminium alloys—Part 2:Chemical analysis
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 20975.4-2020 history
2020GB/T 20975.4-2020 Methods for chemical analysis of aluminium and aluminium alloys—Part 4:Determination of iron content
2008GB/T 20975.4-2008 Methods for chemical analysis of aluminium and aluminium alloys.Part 4: Determination of iron content.Orthopenanthroline photometric method
2001GB/T 6987.4-2001 Aluminium and aluminium alloys--Determination of iron content--Orthopenanthroline photometric method