Application of quaternary acid mixture to microwave digestion effective for various kinds of steel samples

Kenichi Nakayama, Kazuaki Wagatsuma

Research output: Contribution to journalReview articlepeer-review

4 Citations (Scopus)


This paper suggests a procedure of an improved digestion method, which can be applied to a variety of steel samples, for preparing the sample solution to quantify alloyed elements and sulfur simultaneously in inductively coupled plasma atomic emission spectrometry. A conventional digestion method using a mixture of hydrochloric and nitric acid has a poor ability to decompose tool steel completely. Alternatively, a microwave digestion method, in which an acid mixture of hydrochloric acid, hydrofluoric acid, nitric acid, and phosphoric acid was prepared with 1:1:1:1 volume ratio, enabled various steel samples including tool steel and stainless steel to be fully decomposed. Due to no addition of sulfuric acid, the sulfur content in the samples could be determined. The suggested procedure was applicable to determine sulfur, vanadium, chromium, manganese, cobalt, nickel, molybdenum, and tungsten in a variety of steel alloys using the same dissolution procedure.

Original languageEnglish
Pages (from-to)193-195
Number of pages3
JournalIsij International
Issue number1
Publication statusPublished - 2020


  • High-speed tool steel
  • Inductively coupled plasma atomic emission spectrometry
  • Sample preparation
  • Stainless steel

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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