GB 14883.9-2016 Translated English of Chinese Standard. GB14883.9-2016: National food safety standard - Determination of iodine-131, a radioactive substance in foods [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]This standard applies to the determination of iodine-131 (131I) in various foods. |
Contents
| 3 | |
Scope | 4 |
Analytical procedures | 5 |
Expression of analytical results | 7 |
Others | 8 |
Instruments and equipment | 10 |
Expression of analytical results | 12 |
Others | 13 |
Appendix A Diagram of sample press | 14 |
Appendix B Total correction factor for 131I measurement efficiency at different heights and apparent densities | 15 |
Common terms and phrases
1311 standard solution 137Cs aqueous solution 137Cs monitoring source 2.5 mol/L potassium Add water amount of water apparent density appropriate amount aqueous phase beaker box whose inside branch ratio Calculate the apparent Calculate the dry-to-fresh carbon tetrachloride concentration of 1311 decay constant detachable funnel detection efficiency Determination of iodine-131 Dissolve dry sample dry-to-fresh ratio Drying box enamel pan energy calibration Figure A.1 food safety standard g of sodium germanium half-life hydraulic press iodine carrier solution low-background ẞ-meter manual sample press Mix it uniformly mL of iodine mL of water mol/L potassium carbonate National food safety organic phase potassium carbonate solution radioactive source reference peak relationship curve sample box sample source sample's separatory funnel Shake silver iodide silver nitrate silver nitrate solution Sodium bisulfite Sodium hypochlorite Sodium iodide sodium nitrite source of 137Cs stainless-steel pan standard source sulfite water to dilute water to rinse Weigh weight and height y-spectroscopy method