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<br />Table 2, Quality control results for selenium analysis of water, diet, and tissue samples by <br />c. hydride generation atomic absorption spectroscopy, <br />C) <br />t'~ <br />h:~ <br />;,~) <br />..~ <br /> <br /> Matrix' <br />Measure Water Diet Tissue <br />Limit of detection 0,63 (0,35) 0,] 00 (0,0390) 0,064 (0,004) <br />(llgIL or Ilg/g)b [8] [5] [3] .. <br />. , <br />Method precision 6.0 (2.4) 6,1 (2.3) 3.7 (1.9) <br />(%RSD)C [8] [5] [3] <br />Oigested spikes 97 (8) 102 (9) 97 (5) <br />(% recovery)d [16] [10] [6] <br />Analysis spikes 101 (6) 98 (9) 103 (12) <br />(% recovery)' [8] [5] [3] <br />Reference water 11,9 (0,5) <br />(llgIL, NIST SRM 1643d/ [8] <br />Reference material 1.36 (0.11) 1.19 (0.02) <br />(llg/g, NRCC OORM-2)g [5] [3] <br /> :- ~ <br />'Data are means with SD in parentheses and N in brackets. <br /> <br />bLimit of detection = 3(SDb2 + SO/)0.5, where SDb is standard deviation of blank and SDs is <br />standard deviation of low-level sample. <br /> <br />C%RSD = percent relative standard deviation calculated as SOfMean x 100 for a triplicate <br />detennination of a representative sample for each sample run. <br /> <br />dSamples spiked with seleno-DL-methionine at the beginning of chemical preparation. <br /> <br />'Digested samples spiked with sodium selenite at instrument to check for matrix interference. <br /> <br />fNIST SRM 1643d = Nationallnstitute of Standards and Technology Standard Reference <br />Material Trace Elements in Water 1643d; certified concentration = 11.26-11.60 llglL, <br />recommended concentration = 10.13-12.76 1lg!L (based on in-house quality controVquality <br />assurance program at the Columbia Environmental Research Center, B, Brumbaugh, <br />Columbia, MO, personal communication). <br /> <br />~CC DORM-2 = National Research Council of Canada dogfish muscle tissue DORM-2; <br />certified concentration = 1.31-1.49 llg/g, recommended concentration = 1.18-1.64 llg/g (based <br />on in-house quality controVquality assurance program at the Columbia EnvironmentalResearch <br />Center, B, Brumbaugh, Columbia, MO, personal communication), <br /> <br />22 <br />