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Food and Nutrition

The Fluorometric Determination of Vitamin A in Dairy Products

Table 4 - Variation Among Laboratories in Milk Check Samples (Units/100 mL)
Lab Jan 1981 Mar 1981 May 1981 Sept 1981 Nov 1981
A 132 203 186 119 228 92 94 247 131 100 269 284 233 153 261 156 85 113 182 271
B 130 203 178 128 272 106 137 320 133 100 293 322 244 153 289 165 70 105 163 249
C 131 205 167 123 217   92 208 110 85 257 254 228 133 262 156 72 99 149 251
D 123 197 170 133 185 68 103 208 115 93 240 258 213 127 242 158 68 97 133 219
E 147 228 194 140 234 92 101 252 105 81 226 247 215 136 239 148 75 106 173 267
F 114 180 159 113 190 73 89 227 117 90 240 251         80 113 171 249
Mean 130 204 176 126 221 86 103 244 119 92 254 269 227 140 258 157 75 106 162 251
S.D. 10.9 15.6 12.9 9.8 31.9 15.5 17.6 41.8 11.3 7.8 24.2 28.9 12.9 11.9 18.9 6.1 6.4 6.7 18.0 18.4
CV% 8.4 7.7 7.3 7.7 14.4 18.0 17.2 17.1 9.5 8.5 9.5 10.7 5.7 8.5 7.3 3.9 8.6 6.4 11.1 7.3

Average C.V. = 9.8% 20 samples - 6 laboratories

Date Modified: 2002-10-21

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