title: [Development and evaluation of determination methods for boric acid in agar using ICP-AES and ICP-MS].
abstract: A new test method for boric acid in agar was developed. After digestion with nitric acid, the concentration of boron was measured by ICP-AES or ICP-MS with internal standards. Collaborative studies involving 5 laboratories were conducted to evaluate the new method by using a finely powdered agar sample and a standard sample (NIST SRM SRM1570a). The repeatability and reproducibility were very good. Moreover, HORRAT(R) values were less than 2. Therefore, it was considered that the new method is acceptable for the determination of boric acid in agar.
authors.affiliation: National Institute of Health Sciences, 1181 Kamiyoga, Setagaya-ku, Tokyo 1588501, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Hamano-Nagaoka
authors.forename: Rieko
authors.initials: R
authors.lastname: Matsuda
authors.forename: Tamio
authors.initials: T
authors.lastname: Maitani
mesh_terms: D000362:Agar / Q000737:chemistry*; D001888:Boric Acids / Q000032:analysis*; D001895:Boron / Q000032:analysis; D013058:Mass Spectrometry / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods
chemical_list: D001888:Boric Acids; D000362:Agar; D001895:Boron; C032688:boric acid