caa a22 4500 465748732 CHVBK 20180323111827.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00322503 doi (NATIONALLICENCE)springer-10.1007/BF00322503 Determination of sampling constants for selenium in biological reference materials by neutron activation [Elektronische Daten] [A. Chatt, R. Rao, C. Jayawickreme, L. McDowell] Summary: A cyclic instrumental neutron activation analysis method has been used to calculate sampling constants and to evaluate homogeneity for Se in five biological reference and certified reference materials, namely NRC lobster hepatopancreas (RM TORT-1), IAEA horse kidney (RM-H8), and NIST bovine liver (SRM-1577a), oyster tissue (SRM-1566) and mixed diet (RM-8431). The between-weight-range heterogeneity has been observed to be no greater than the within-weight-range heterogeneity. The subsampling standard deviation (S s) has been found to be less than the measurement standard deviation (S m) for H-8 (>5 mg sample) and TORT-1 (>50 mg). For 1577a, S s is almost equal to S m; while S s is 2-3 times higher than S m for the other two materials. The sampling constants varied between 0.04 and 3.0 g for four materials while the mixed diet had a value of 31 g. Springer-Verlag, 1990 Chatt A. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut Rao R. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut Jayawickreme C. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut McDowell L. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 399-407 0937-0633 338:4<399 1990 338 216 https://doi.org/10.1007/BF00322503 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00322503 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chatt A. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 700 1- Rao R. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 700 1- Jayawickreme C. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 700 1- McDowell L. Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, B3H 4J1, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 773 0- Fresenius' Journal of Analytical Chemistry Springer-Verlag 338/4(1990-01-01), 399-407 0937-0633 338:4<399 1990 338 216 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer