“…6.6 Examples of biological, food, agricultural and related RMs for chemical composition available from, principally, government agency suppliers(Ihnat 1988(Ihnat , 1992(Ihnat ,1998a; International Atomic Energy Agency 1998; Institute for ReferenceMaterials and Measurements 1999; National Oceanic and Atmospheric Administration 1995; Trahey 1998)4 6.6 Examples of biological, food, agricultural and related RMs for chemical composition available from, principally, government agency suppliers(Ihnat 1988(Ihnat , 1992(Ihnat ,1998a; International Atomic Energy Agency 1998; Institute for ReferenceMaterials and Measurements 1999; National Oceanic and Atmospheric Administration 1995; Trahey 1998)4 …”