GB 5009.94-2012 English PDF

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GB 5009.94-2012: Determination of rare earth elements in plant food
Status: Valid

GB 5009.94: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 5009.94-2012	209	Add to Cart	3 days	Determination of rare earth elements in plant food	Valid
GB/T 5009.94-2003	199	Add to Cart	2 days	Determination of rare earths in vegetable foods	Obsolete

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GB 5009.86   GB 5009.75   GB/T 5009.78   GB 5009.89   GB 5009.97   GB 5009.88   

Basic data

Standard ID: GB 5009.94-2012 (GB5009.94-2012)
Description (Translated English): Determination of rare earth elements in plant food
Sector / Industry: National Standard
Classification of Chinese Standard: C53
Classification of International Standard: 67.040
Word Count Estimation: 9,933
Older Standard (superseded by this standard): GB/T 5009.94-2003; GB/T 7630-1987; GB/T 22290-2008; GB/T 23199-2008
Regulation (derived from): Ministry of Health Bulletin 2012 No. 9
Issuing agency(ies): Ministry of Health of the People's Republic of China
Summary: This Chinese standard specifies the inductively coupled plasma mass spectrometry method of rare earth elements in plant foods. This standard applies to cereal grains, legumes, vegetables, fruits, tea and other plant foods scandium (Sc), yttrium (Y), lanth

GB 5009.94-2012: Determination of rare earth elements in plant food

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Determination of rare earth elements in plant food National Standards of People's Republic of China People's Republic of China Ministry of Health issued Issued on. 2012-05-17 2012-11-17 implementation National Food Safety Standard Determination of Rare Earth Elements in plant foods

Foreword

This standard replaces GB/T 5009.94-2003 "Determination of rare earths in vegetable foods" and at the same time instead of GB/T 22290-2008 "tea Leaves of rare earth elements by inductively coupled plasma mass spectrometry ", GB/T 23199-2008" tea rare earth elements by inductively coupled Combined plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry, "rare earth oxide wheat GB/T 7630-1987 < rice Determination Tribromoarsenazo spectrophotometry. " This standard compared with GB/T 5009.94-2003, main changes are as follows. - By the name of "vegetable foods Determination of rare earth" to "Determination of rare earth elements in vegetable foods"; - Added by inductively coupled plasma mass spectrometry; - Remove the three-wavelength spectrophotometric method. National Food Safety Standard Determination of Rare Earth Elements in plant foods

1 Scope

This standard specifies the method of rare earth elements in plant foods measured by inductively coupled plasma mass spectrometry. This standard applies to grain cereals, legumes, vegetables, fruits, tea and other plant foods scandium (Sc), yttrium (Y), lanthanum (La), Cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), Erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu) measurement. Principle 2 The sample was treated as sample digestion solution, the sample solution is atomized by a carrier gas is fed into the plasma torch or ICP, after evaporation, Dissociation and ionization of atoms and other processes, converted to positively charged ions, the ion-collection system into the mass spectrometer, the mass spectrometer according to their mass charge Separation ratio. For the mass-to-charge ratio, the signal intensity is proportional to the mass number of the ions into the mass spectrometer, i.e., the concentration of the sample mass and the letter Number proportional to the intensity. Element concentration was determined by measuring the mass of the sample solution in the signal strength.

3 Reagents and materials

3.1 Reagents Note. Unless otherwise indicated, the reagents used in this method are excellent pure water as a water GB/T 6682 regulations. 3.1.1 nitric acid (HNO3). 3.1.2 argon (Ar). purity argon gas ( > 99.999%) or liquid argon. 3.2 reagent preparation Nitric acid solution (5 + 95). 50 mL of nitric acid, dilute with water to 1000 mL. 3.3 Standard 3.3.1 REE stock solution (10 μg/mL) (Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu). 3.3.2 the internal standard stock solution (10 μg/mL) (Rh, In, Re). 3.3.3 instrument tuning stock solution (10 ng/mL) (Li, Co, Ba, Tl). 3.4 Standard Solution 3.4.1 The use of rare earth elements mixed standard solution (100 ng/mL). Take the right amount of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, the elements Ho, Er, Tm, Yb, Lu single standard or standard stock solution element mixed standard stock solution with a nitric acid solution by Grade diluted to a concentration of 100.0 μg/L using the element mixed standard solution. 3.4.2 standard curve working solution. Apply the solution using standard elements mixed with nitric acid solution formulated at a concentration of 0 μg/L, 0.0500 μg/L, 0.100 μg/L, 0.500 μg/L, 1.00 μg/L, 2.00 μg/L standard series or concentration of 0 μg/L, 1.00 μg/L, 2.00 μg/L, 5.00 μg/L, 10.0 μg/L, 20.0 μg/L standard series, also based on the concentration of rare earth elements in the sample solution appropriate standards regulating the concentration series Range. 3.4.3 an internal standard solution (1 μg/mL). proper amount of internal standard stock solution (10 μg/mL), diluted 10-fold with a solution of nitric acid (595), the concentration of Of 1 μg/mL. 3.4.4 instrument tuning use solution (1 ng/mL). instrument tuning take appropriate stock solution was diluted with a solution of nitric acid (595) 10-fold concentration Of 1 ng/mL.

4 instruments and equipment

4.1 Inductively coupled plasma mass spectrometry (ICP-MS). 4.2 Balance. a sense of the amount of 0.1 mg and 1 mg. 4.3 high-pressure sealed microwave digestion system with high pressure teflon digestion tank. 4.4 closed high pressure digestion device with digestion inner tank. 4.5 thermostatic oven (oven). 4.6 50 ℃ ~ 200 ℃ temperature heating plate. Step 5 Analysis 5.1 Sample Preparation 5.1.1 Sample pretreatment 5.1.1.1 dry sample. grain cereals, beans and other edible parts taken by high speed grinding mill, mix and set aside. 5.1.1.2 wet sample. vegetables, fruits and other edible parts taken, washed clean, dry gauze or wipe dry, homogenized by homogenizer, spare. 5.2 Sample Digestion 5.2.1 Microwave Digestion. Weigh 0.2 g ~ 0.5 g (accurate to 0.001 g) at high pressure digestion tank, added 5 mL HNO3, tighten the lid, Place 1 h, according to the microwave digestion instrument's standard operating procedures digestion (digestion conditions see Table A.1). Removed after cooling, slowly open the Lid exhaust, high pressure digestion tank placed on a hot plate temperature, rush acid at 140 ℃. Remove and let cool digestion tank, digestive juices will be transferred to 10 mL ~ 25 mL flask with a small amount of water 3 washes tank washings were combined in the flask and dilute to volume, mix standby; while for trial Agent blank. 5.2.2 closed high pressure tank Solution. Weigh sample 0.5 g ~ 1.g (accurate to 0.001 g) in digestion in the tank, added 5 mL of nitric acid immersion overnight. Inside cover cap, tighten stainless steel jacket, put in oven temperature, 140 ℃ ~ 160 ℃ holding 4 h ~ 6 h, the natural cooling box To room temperature, slowly unscrew the stainless steel jacket, inside the digestion tank removed and placed on a hot plate temperature, rush acid at 140 ℃. Digestion inner tank discharge After cooling, the digest was transferred to a 10 mL ~ 25 mL volumetric flask, with a small amount of water 3 washes tank washings were combined in the flask and is scheduled To volume, mix standby; at the same time as a reagent blank. 5.3 Instrument Reference conditions 5.3.1 The device according to standard operating procedures for commissioning the instrument start, quality calibration, argon gas flow rate and the like. Suitable conditions for selection, including Nebulizer flow rate detector and the ion lens voltage, RF incident power, so that the formation of oxides CeO/Ce < 1% and doubly charged compounds form To [70/140] < 3%. 5.3.2 Determination of reference conditions. After tuning the instrument to achieve the measurement requirements, edit determination, interference correction equation (corrected europium (Eu) Element) and select each test isotopes of scandium (45Sc), yttrium (89Y), lanthanum (139La), cerium (140Ce), praseodymium (141Pr), neodymium (146Nd), Samarium (147Sm), europium (153Eu), gadolinium (157Gd), terbium (159Tb), dysprosium (163Dy), holmium (165Ho), erbium (166Er), thulium (169Tm), Ytterbium (172Yb), lutetium (175Lu), the introduction of an internal standard solution line, observing the internal standard sensitivity, the instrument generates the signal strength of 000 ~ 400 600 000 cps (reference instrument operating conditions, see Appendix A.2). Analog conversion coefficient measuring pulse, to meet the requirements, the reagent blank, ) ( × - VCC ioi Standard series, the sample solution is measured sequentially. Each tested element regression analysis to calculate the linear regression equation. Europium (Eu) element using the correction equation. [151Eu] = [151] - [(Ba (135) O)/Ba (135)] × [135]. Formula, [(Ba (135) O) / Ba (135)] is an oxide ratio, [151], [135] were mass mass number 151 and 135 of the signal strength of CPS. 5.4 standard curve The standard series working solution were injected into the inductively coupled plasma mass spectrometer to measure the response signal corresponding to the value of the standard working solution The concentration of abscissa, in response to the value - ion count value per second (CPS) for the vertical axis, the standard curve. 5.5 Determination of the sample solution The sample solution was injected into the inductively coupled plasma mass spectrometer, to obtain the corresponding response signal, according to the standard curve obtained in the test solution The concentration of the corresponding elements, at least twice the number of replicates.

6 expression analysis

I-th sample REE contents in accordance with the formula (1). (1) Where. - I-th sample rare earth element content in milligrams per kilogram (mg/kg); - I-th sample solution measured values of rare earth elements, in micrograms per liter (μg/L); i0 - Sample blank solution in the i-th measured value of rare earth elements, in micrograms per liter (μg/L); V-- the sample digest volume to volume, in milliliters (mL of); m-- sample sample weight in grams (g); 1000-- unit conversion. The arithmetic mean of the results obtained with the two under the same condition of independent measurement results expressed reservations three significant figures. If the oxide content analysis results need to be expressed, then see Appendix B, the content of each element multiplied by a conversion factor F.

7 precision

When samples of scandium, yttrium, lanthanum, cerium, neodymium and other rare earth element content of greater than 10 μg/kg, twice under repeated conditions of independence When the absolute difference between the measurement results shall not exceed 10% of the arithmetic mean of the sample the rare earth element content of less than 10 μg/kg, in the same condition Two independent determination results obtained under the absolute difference may not exceed 20% of the arithmetic mean.

8 Other

The detection limit of this standard. sample 0.5 g, volume 10 mL, measured each rare earth element detection limits (μg/kg) were Sc 0.6, Y 0.3, La 0.4, Ce 0.3, Pr 0.2, Nd 0.2, Sm 0.2, Eu 0.06, Gd 0.1, Tb 0.06, Dy 0.08, Ho 0.03, Er 0.06, Tm 0.03, Yb 0.06, Lu 0.03. The limit of quantitation (μg/kg) were Sc 2.1, Y 1.1, La 1.4, Ce 0.9, Pr 0.7, Nd 0.8, Sm 0.5, Eu 0.2, Gd 0.5, Tb 0.2, Dy 0.3, Ho 0.1, Er 0.2, Tm 0.1, Yb 0.2, Lu 0.1.

Appendix A

Sample measurement reference conditions A.1 microwave digestion reference conditions shown in Table A.1. Table A.1 microwave digestion Reference conditions The step of controlling the temperature Heating time min Holding time min A.2 inductively coupled plasma mass spectrometer operating conditions refer to Table A.2. Table A.2 inductively coupled plasma mass spectrometer operating conditions refer Instrument Instrument Parameter Value Parameter Value RF power 1350 W Nebulizer salt type Plasma gas flow rate 15 L/min Acquisition mode Spectrum Auxiliary gas flow 1.0 L/min measured 3 points The carrier gas flow rate 1.14 L/min Automatic Detection Spray chamber temperature 2 ℃ 3 repetitions

Appendix B

The rare earth element oxide conversion factor Oxides of rare earth elements and common, each element in terms of oxide conversion factor, see Table B.1. Table B.1 common oxides of rare earth elements and each element is converted to oxide conversion factor A element atomic weight molecular weight M m M oxide AmOn conversion factor F Sc 44.96 Sc2O3 137.9 2 1.534 Y 88.91 Y2O3 225.8 2 1.270 La 138.9 La2O3 325.8 2 1.173 Ce 140.1 CeO2 172.1 1 1.228 Pr 140.9 Pr6O11 1021.4 6 1.208 Nd 144.2 Nd2O3 336.4 2 1.166 Sm 150.4 Sm2O3 348.8 2 1.160 Eu 152.0 Eu2O3 352.0 2 1.158 Gd 157.3 Gd2O3 362.6 2 1.153 Tb 158.9 Tb4O7 747.6 4 1.176 Dy 162.5 Dy2O3 373.0 2 1.148 Ho 164.9 Ho2O3 377.8 2 1.146 Er 167.3 Er2O3 382.6 2 1.143 Tm 168.9 Tm2O3 385.8 2 1.142 Yb 173.0 Yb2O3 394.0 2 1.139 Lu 175.0 Lu2O3 398.0 2 1.137 Note. Each element in terms of oxide conversion factor F F = M [AmOn]/(m · M [A]) Where. A-- rare earth elements; M [A] - atomic weight rare earth elements; M [AmOn] - rare earth oxide molecular weight; m-- rare earth oxides of rare earth elements in the formula-based mole. ......

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