Agricultural product (element) testing

This standard specifies the flame atomic absorption spectrometry, inductively coupled plasma emission spectrometry, and inductively coupled plasma mass spectrometry for the determination of iron content in food. This standard is applicable to the determination of iron content in food. After the sample is digested, it is atomized by atomic absorption flame and the absorbance value is measured at 248.3 nm. The absorbance value of iron is directly proportional to the iron content within a certain concentration range, and is quantitatively compared to the standard series. Unless otherwise specified, all reagents and materials used in this method are high-grade pure, and the water is Grade II water according to GB/T6682. 3.1 Reagent 3.1.1 Nitric acid (HNO,). 3.1.2 Perchlorate (HCIO, 3.3.1.3 Sulfuric acid (H: SO,) 3.2 Reagent preparation 3.2.1 Nitric acid solution (5+95): Measure 50 mL of nitric acid, pour it into 950 mL of water, and mix well. 3.2.2 Nitric acid solution (1+1): Measure 250 mL of nitric acid, pour it into 250 mL of water, and mix well. 3.2.3 Sulfuric acid solution (1+3): Measure 50 ml. of sulfuric acid, slowly pour it into 150 mL of water, and mix well. 3.3 Standard ammonium iron sulfate [NH, Fe (SO,): · 12H, O, CAS No. 7783-83-7]: Purity> 99.99%. Or a certain concentration of iron standard solution certified by the state and awarded with a standard substance certificate. 3.4 Preparation of standard solution 3.4.1: Iron standard stock solution (1000 mg/L): Accurately weigh 0.863 1 g (accurate to 0.000 1 g) of ammonium iron sulfate, dissolve in water, add 1.00 mL of sulfuric acid solution (1+3), transfer to a 100 mL volumetric flask, add water to volume to the mark. Mix well. The mass concentration of this iron solution is 10o0 mg/L. 3.4.2 Iron standard intermediate solution (100 mg/L): Accurately pipette 10 mI of iron standard reserve solution (1000 mg/L) into a 100 mL volumetric flask

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