OMA Protocol Review: OMAMAN-56 Sulfites in Shrimp

Recovery Results of the recovery experiment are presented in Table 12. All recovery values ranged between 80- 110 %, except in the case of raw shrimp head on at 50 mg/kg on day 1/analyst 1 in which the obtained result was 78 % for recovery. However, the same sample measured by analyst 2 on day 2 showed a result of 86 % for recovery.

Table 12. Recovery of sodium metabisulfite by matrix

Known sodium metabisulfite concentration (mg/Kg)

Biofish results (mg/kg)

Recovery (%)

Average (mg/kg)

Matrix

Day and analyst

6 0 0 0 5 0 0 0 0 0

Day 1 Analyst 1

Raw shrimp head off

0

2.2

Day 2 Analyst 2

Raw shrimp head off

0

0.0

41 42 37 40 40 39 42 42 41 40 81 83 84 83 82 81 82 83 83 84

Day 1 Analyst 1

Raw shrimp head off

50

40

80

Day 2 Analyst 2

Raw shrimp head off

50

41

82

Day 1 Analyst 1

Raw shrimp head off

100

83

83

Day 2 Analyst 2

Raw shrimp head off

100

83

83

Raw shrimp head off

250

Day 1

233

237

95

24