title: Development of a mushroom powder Certified Reference Material for calcium, arsenic, cadmium and lead measurements.
abstract: Isotope dilution mass spectrometry and standard addition techniques were developed for the analysis of four elements (Ca, As, Cd and Pb) in a mushroom powder material. Results from the validated methods were compared to those of other national metrology institutes in the CCQM-K89 intercomparisons and the results were in excellent agreement with the reference values. The same methods were then used for the assignment of reference values to a mushroom powder Certified Reference Material (CRM). The certified values obtained for Ca, As, Cd and Pb were 1.444 ± 0.099 mg/g, 5.61 ± 0.59 mg/kg, 1.191 ± 0.079 mg/kg and 5.23 ± 0.94 mg/kg, respectively. The expanded measurement uncertainties were obtained by combining the uncertainty contributions from characterization (uchar) and between-bottle homogeneity (ubb).
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore.
authors.forename: Gina
authors.initials: G
authors.lastname: Chew
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore.
authors.forename: Lay Peng
authors.initials: LP
authors.lastname: Sim
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore.
authors.forename: Sin Yee
authors.initials: SY
authors.lastname: Ng
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore.
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore. Electronic address: Richard_SHIN@hsa.gov.sg.
authors.forename: Richard Y C
authors.initials: RYC
authors.lastname: Shin
authors.affiliation: Chemical Metrology Laboratory, Chemical Metrology Division, Applied Sciences Group, Health Sciences Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore 117528, Singapore.
authors.forename: Tong Kooi
authors.initials: TK
authors.lastname: Lee
mesh_terms: D000363:Agaricales / Q000737:chemistry*; D001151:Arsenic / Q000032:analysis*; D002104:Cadmium / Q000032:analysis*; D002118:Calcium / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D011208:Powders; D012015:Reference Standards
chemical_list: D011208:Powders; D002104:Cadmium; D007854:Lead; D001151:Arsenic; D002118:Calcium
keywords: Certified Reference Material; International comparison; Isotope dilution mass spectrometry; Mushroom powder; Standard addition