GB 5009.256-2016 Translated English of Chinese Standard. GB5009.256-2016: National Standard of Food Safety - Determination of Phosphates in Foodshttps://www.chinesestandard.net, 24 juni 2018 - 12 sidor This Standard specifies the determination of phosphates in foods. This Standard is applicable to the determination of phosphate, pyrophosphate, hexametaphosphate, trimetaphosphate, and tripolyphosphate in foods. The specimen sampling shall adopt the corresponding method to extract and purify; take the potassium hydroxide solution as the eluent; separated by anion exchange column and detected by conductivity detector. Qualitative with retention time, and quantified by external standard method. |
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Apparatus | 5 |
Expression of Analytical Results | 9 |
Appendix A Conversion Factor of Polyphosphate Radical | 11 |
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10mmol/L sodium hydroxide accurate to 0.001g adjusted properly centrifuge at 8000r/min chromatograph conductivity detector constant volume conversion factor different phosphate radical dilute with 10mmol/L eluent extraction at 80°C Factor of Polyphosphate filter paper filtered through filter filtrate at 4°C hexametaphosphate radical II RP column ith phosphate radical keep the stationary Methanol mix evenly needle filter once every 5min OnGuard II RP perform ultrasonic extraction phase completely dispersed phosphate radical content phosphate radical standard pipette Puffed foods pyrophosphate radical radical into phosphate radical standard intermediate radical standard stock radicals are tested Reagents rice noodles room temperature sampling quantity shake once shaking and inverting sodium hydroxide solution sodium tripolyphosphate solution contains 0.1g solution to wash solution was filtered standard curve standard intermediate stock standard solution 1000mg/L standard substance starch desserts stationary phase completely supernatant for later-use take 2.5g accurate take filtrate take the supernatant trimetaphosphate radical tripolyphosphate radical various polyphosphate radicals volume of 50mL