Page 186 - Analytical method for food addtives

124 Analytical methods for food additives

Reference 8 9 19 20 2

(n=3) (n=3) (n=3)

0.41 ±0.02 µg/g 0.18 ±0.01 µg/g 0.30 ±0.01 µg/g Preconcentration factor 70. 0.023 mg/L 0.017 mg/L 0.108 mg/L

Linear calibration curve 2–40 ng NO 2 -N/mL. Detection Limits: 1.4 ngNO 2 -N/mL for SAM–NS, 1.2 ngNO 2 - N/mL for SM–NS and 1.0 ngNO 2 –N/mL for SD–NS. Concentration factor is 8 for SAM–NS and SM–NS and 12 for SD–NS. Method successfully applied to the determination of low levels of nitrite in water and some fruit samples.

Statistical parameters Apple Pear Persimmon Linear range 0.4–24 ng/mL. Rain water A Rain water B River water see Appendix 2 see Appendix 2 see Appendix 2

Extent of validation Precision of method established and applied to real samples (n=3) Precision of method established and applied to real samples (n=3) Repeatability and reproducibility Repeatability and reproducibility Repeatability

Water and fruit Milk and milk Milk and milk Milk and milk

Matrix Water products products products

Table 9.2 cont’d Method Spectro- photometric Spectro- photometric Segmented flow analyses Flow injection analyses with in-line dialysis Spectrometry