OMA Protocol Review: OMAMAN-56 Sulfites in Shrimp

(b) Results.- The results are presented in Table 1. Linearity and residual plots for the different calibration ranges are presented in Figures 2, 3, 4, and 5. The results obtained show that the method is linear. The residual plots appear to have a sigmoidal pattern or concave if the zero point is disregarded. In either case, the patterns look non-random, but the residuals are all <10%, varying from 0.2% to 3.9% for the 30-600 ppm range and 0.4% to 9.3% for the 10-300 ppm range. Thus, the response is very close to linear.

Table 1. Linearity in 30-150 ppm and 50-300 ppm ranges. 30-150 ppm

50-300 ppm

Sodium sulfite Std., ppm

Biofish result, ppm

Sodium sulfite Std., ppm

Biofish result, ppm

Mean SD Residual

Mean SD Residual

0 0 0 0 7 8 8 8

0 0 0 0

0

0

0

0.035

0

0

0

0.464

23 25 23 23 47 45 47 43 99 98 97 95

10

8

0.5

0.747

30

24 1.0 0.942

26 28 27 30 47 50 46 47 95

30

28 1.7

0.424

50

46 1.9 0.384

50

48 1.7

0.198

100

97 1.7 -0.562

142 144 147 138 294 285 278 283 525 533 521 559

102

100

98 3.1 -0.610

150

143 3.8 -0.643

97 96

148 153 147 147 285 299 275 280

150

149 2.9 -1.903

300

285 6.7 -1.680

300

285 10.3 1.108

600

535 17.1 1.095

12