TABLE H4. CONTAMINANT LEVELS IN NIH 07 RAT AND MOUSE RATION (Continued) 



(a) All values were less than the detection limit, given in the table as the mean. 



(b) The detection limit was reduced from 10 ppb to 5 ppb after 7/81. 



(c) Source of contamination: alfalfa, grains, and fish meal 



(d) Source of contamination: soy oil and fish meal 



(e)One batch contained less than 0.5 ppm. The value was < 0.04, and the batch was produced on 4/27/81. 



(f)MPN = most probable number 



(g) Mean, standard deviation, and range exclude one value of 150 ppm obtained for the batch produced on 8/26/82. 



(h) Mean, standard deviation, and range include the high value listed in footnote (g). 



(i) All values were corrected for percent recovery. 



(j) Mean, standard deviation, and range exclude two very high values of 101.6 and 100.3 ppb obtained for batches produced on 



1/26/81 and 4/27/81. 



(k) Mean, standard deviation, and range include the high values listed in footnote (j). 



(I) Mean, standard deviation, and range exclude two very high values in the range of 97.9 and 99 ppb obtained for batches 



produced on 1/26/81 and 4/27/81 . 



(m) Mean, standard deviation, and range include the very high values given in footnote (1). 



(n)BHC = hexachlorocyclohexane or benzene hexachloride. 



(o) There was one observation above the detection limit; the value and date it was obtained are given under the range. 



(p) There were two observations above the detection hmit; the values and dates they were obtained are given under the range. 



(q) Eleven batches contained more than 0.05 ppm. 



215 Nitrofurantoin, NTP TR 341 



