GB 5009.33-2016 Translated English of Chinese Standard. GB5009.33-2016: National Food Safety Standard - Determination of Nitrite and Nitrate in Foods [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 2018 M06 24 - 22 pages This Standard specifies the method of determining nitrite and nitrate in foods. This Standard is applicable to the determination of nitrite and nitrate in foods. Method I -- Ion Chromatography Precipitate protein and remove fat from the sample; adopt the corresponding method to extract and purify; take potassium hydroxide solution as the eluent; adopt anion exchange column for separation; take conductance detector or UV detector for detection. Determine the nature with the retention time and quantify with the external standard method. |
Contents
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| 4 | |
| 5 | |
Analytical Procedures | 6 |
Expression of Analysis Results | 8 |
Precision | 9 |
Reagents and Materials | 10 |
Instruments and Equipment | 12 |
Analytical Procedures | 15 |
Expression of Analysis Results | 17 |
Precision | 18 |
Reagents and Materials | 19 |
Instruments and Equipment | 20 |
Calculation Result | 21 |
Appendix A Chromatogram of Nitrite and Nitrate | 22 |
Common terms and phrases
100 mL volumetric 150 mL conical accurate to 0.001 add 5 mL add 80 mL Add water ammonia buffer solution arithmetic mean cadmium particle Cadmium sulfate calculated by sodium column 1.0 mL constant volume content of nitrite Copper sulfate cottage cheese Determination of Nitrite eluent expressed in mL external diameter extraction for 30 filter paper filtrate for later g accurate hydrochloric acid later usage mass concentration mg/L mL conical flask mL of hydrochloric mL of water mL volumetric flask naphthalene ethylenediamine hydrochloride nitrate calculated nitrate ion nitrite and nitrate paper to filter place it evenly potassium ferrocyanide solution potassium hydroxide Quantitatively transfer reaches the room reserve the filtrate room temperature sodium nitrite solution of nitrite Spectrophotometry spongy cadmium standard curve Standard Solutions Standard stock solution start static sulfanilic acid test solution ultrasonic extraction water bath water to dilute water to rinse weigh-take weigh-take 5 g zinc acetate Zinc sulfate