This standard specifies the determination of potassium and sodium in food by flame emission spectrometry. This standard is applicable to the determination of potassium and sodium in various foods. The detection limit of this method is 0.05μg for potassium and 0.3μg for sodium; the linear range is 0.1μg to 0.5μg for potassium and 1.0μg to 4.0μg for sodium. GB/T 5009.91-2003 Determination of potassium and sodium in food GB/T5009.91-2003 Standard download decompression password: www.bzxz.net

[CS 67.040
National Standard of the People's Republic of China
GB/T 5009.91—2003
Replaces CB/12357--39
Determination of potassium and sodium in foods
Determination of potassium and sodium in foods2003-08-11Promulgated
Coordinated by the Ministry of Health of the People's Republic of China
Standardization Administration of the People's Republic of China
Implementation on 2004-01-01
GB/T5009.91—2003
This standard has the same consistency with ISO B070, the method of emission light by fire (187 edition). This standard replaces the determination method of sodium and potassium in foods in 2-9. Compared with GR/T239719%, the main changes of this standard are as follows: the Chinese name of the standard is modified, the Chinese name of the standard is collected as the standard for the standard of food delivery and marketing in accordance with the 6B200014-2001 standard compilation rules, and the chemical analysis method of the structure of the standard is included. This standard is proposed and coordinated by the Ministry of Health of the People's Republic of China, and the director of the Institute of Nutrition and Food of the Chinese Academy of Medical Sciences is responsible for the drafting of the standard. This standard is established by Jianhua and Zhengguang Industry. The original standard was issued for the first time in 1u, and this is the first revision: 52
Determination of potassium and sodium in food
Official standard Yao Ding "Determination of sodium and potassium in food by flame emission method" Six standards for the determination of sodium and potassium in various foods: GB/T 5009.91--2003
Method detection limit: potassium is 1.0, copper is 3, linear recommendation is 0.10.5, and the emission intensity of copper is 1.g-4.g2. Principle
The sample is processed by introducing it into a flame flask, and after flame atomization, the emission intensity of copper and potassium is measured respectively. The wavelength of potassium emission is 55.2nm, and that of copper emission is 58nm. The emission intensity is compared with the standard system with their cumulative content, and the quantitative comparison is carried out. 3 Reagents
3.1 Basic brand,
3. 2 Perfluoric acid
3.3 Acid digestion solution: Prepare a solution of sodium perfluoride (Na2O3) and add 1.3.4 Potassium standard solution: Dry the solution in a 10:120 °C oven dry for 2 h. Take 0.6% sodium peroxide and 2.5% sodium peroxide, dissolve them in water and transfer them to 1 ml of water, sieve and store in two bottles for 4 days. This drop is equivalent to 1 mg potassium or sodium 3.5 Standard solution
3.5.1 Potassium standard solution: Collect 5.0 L potassium standard solution at 10 °C and dilute with water to the required concentration: store in 7 bottles for 4 days. 3.5.2 Standard liquid: Pipette 10.1>rr1 standard storage service flow rate 1ml. Volume, use a long help to dilute to the scale, then store in the case of ethylene bottle 1 storage: This sugar Xiao each name is equivalent to Ding: 3 parts: 4 receiver
the market cloaking glass zero plan double with the tour - heavy network potassium liquid set bubble shock method clothing powder after full wash example · pressure self-cleaning water should be repeated, the station language with deionized water rinse ten or dry ten, can be used. 4.1 Commonly used laboratory wall instruments:
4.1.1 High temperature storage (25)mbzxZ.net
4.1.2 Electric heating: 1cnawi-scraw.
4.2 Flame centrifuge.
5 Analysis Steps
5.1 Sample Treatment
Accurately weigh the sample, 9.5g--1g. The sample is 8--26g. The sample is 100g--200g. Heat the digestion blanket for 250min and cover the surface. Heat the digestion on a hot plate or a powder bath. If the digestion is not complete, add nitric acid to digest it and continue heating the digestion. When the sample is colorless and transparent, add a few ml of water and heat to remove excess nitric acid. When the sample is nearly 200ml, remove the cold. Wash with water and transfer to 10mL of a test tube. Digest the digested liquid sample (use the test sample to determine the amount of iron, manganese and sodium dapoxets) with the same digestion as the digested sample, and then perform the above steps to determine the reagent content.
CR/T 50J9.91—2003
5.2 Determination
5.2.1 Determination of evaluation
Take 2.0, 0.1, 1.0, 1, 3.2.2, 1m1. Stop the evaluation standard wave, place it in a 250mL container, dilute it with water until the pressure is equivalent to 0.0.0.13.2.0.30, 1, 0.5 minutes per liter of the digestion sample, the reagent liquid, the potassium standard Xi light Sen are introduced into the fire respectively. The emission mass is just determined: the conditions are: the length of the plate is .5, the room gas pressure is . The gas is adjusted by roasting the fire without a ready-made fire, and the standard line is made according to the corresponding emission strength content,|| tt||5.2.2 Determination of band
and take 3.21.U, 2.0..C.1.)m. calcium standard solution. Divide 100mL and discard in the bottle. Dilute with water to the concentration (1.0 and 1.0 ml in the sieve axis of the pregnant plate bottle, respectively), 1.U.2.3.J, 4.V\ clamp): digest the sample and reduce the reagent liquid in the empty concave, hook the standard release scale into the fire increase to determine its emission intensity: Determination system: The length of the room is 59m. The gas is discharged (4×1P. The gas is not present in the fire price. The emission frequency of the liquid containing the sound is changed by the standard mountain line, and the result is calculated
back or)
X- -2XYX FX100
m21500
cloud city:
-—or the price of the element in the table is a single evil filling point (mx/(()): the monthly test version of the element in the degree (eryouquchashan), the unit is microgram per happiness) T'n
reagent word liquid rise rate, standard curve check unit is microgram per Hui m: vapor sample liquid fixed volume: unit is rate (mL;—or recovery volatile number:
test quality deficiency, unit is gram ():
calculation result table to the last two digits of the minimum effective point
/precision
year weight forget the absolute old value of the determination by the second stimulus shall not be described in arithmetic translation unit (bell and sodium"
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.