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| GB/T 10649-2025 | English | 159 |
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Determination of mixing homogeneity for trace mineral premix
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GB/T 10649-2025
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| GB/T 10649-2008 | English | 149 |
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Determination of mixing homogeneity for mineral premix
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GB/T 10649-2008
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| GB/T 10649-1989 | English | 199 |
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Determination for mixing homogeneity of mineral premix
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GB/T 10649-1989
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PDF similar to GB/T 10649-2025
Basic data | Standard ID | GB/T 10649-2025 (GB/T10649-2025) | | Description (Translated English) | Determination of mixing homogeneity for trace mineral premix | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B46 | | Classification of International Standard | 65.120 | | Word Count Estimation | 8,894 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 10649-2008 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 10649-2025: Determination of mixing homogeneity for trace mineral premix---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT10649-2025
ICS 65.120
CCSB46
National Standards of the People's Republic of China
Replaces GB/T 10649-2008
Determination of the mixing uniformity of trace element premixed feed
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 10649-2008 "Determination of Mixing Uniformity of Trace Element Premixed Feeds" and is consistent with GB/T 10649-2008.
In comparison, aside from structural adjustments and editorial changes, the main technical changes are as follows.
a) The "Scope of Application" has been changed (see Chapter 1, Chapter 1 of the.2008 edition);
b) The "sampling" parameter has been changed (see 4.4.1, Chapter 6 of the.2008 edition);
c) The test procedure for the colorimetric method has been modified (see 4.5, Chapter 8 of the.2008 edition);
d) Added "Atomic Absorption Spectroscopy" (see Chapter 5).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Feed Industry (SAC/TC76).
This document was drafted by. Changsha Xingjia Biotechnology Co., Ltd., Chia Tai Premixed Feed (Tianjin) Co., Ltd., and Xinjia Biotechnology (Changsha).
Limited Liability Company.
The main drafters of this document are. Huang Yiqiang, Ma Qihua, Hong Shuangsheng, Zhou Changhong, Ruan Jing, Jiang Zhongxiu, Xia Zanqin, Zhou Guilin, Sun Yi, and Zhong Fang.
He Changhui and Li Yong.
The release history of this document and the document it replaces is as follows.
---First published in 1989 as GB/T 10649-1989; first revised in.2008;
---This is the second revision.
Determination of the mixing uniformity of trace element premixed feed
1.Scope
This document describes the colorimetric and atomic absorption spectrometry methods for determining the mixing uniformity of trace element premixed feed.
This document applies to the determination of the mixing uniformity of micronutrient premixed feeds. The colorimetric method is applicable to micronutrient premixes with added iron.
Determination of the mixing uniformity of feed; atomic absorption spectrometry is suitable for determining the mixing uniformity of premixed feeds containing trace elements such as copper.
Measurement.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 13885 Determination of the content of calcium, copper, iron, magnesium, manganese, potassium, sodium and zinc in feed by atomic absorption spectrometry
GB/T 20195 Preparation of animal feed samples
3.Terms and Definitions
This document does not contain any terms or definitions that need to be defined.
4.Colorimetric method
4.1 Principle
After the sample is dissolved in acid, ferric ions are reduced to ferrous ions with hydroxylamine hydrochloride, and then reacted with the colorimetric reagent o-phenanthroline to produce orange.
The red complex was analyzed by colorimetric determination of the absorbance of iron. The product was evaluated using the coefficient of variation of absorbance per unit mass of the same batch of samples.
Mixing uniformity.
4.2 Reagents or Materials
Unless otherwise specified, use only analytical grade reagents.
4.2.1 Water. GB/T 6682, Grade III.
4.2.2 Hydrochloric acid.
4.2.3 Hydroxylamine hydrochloride solution (100 g/L). Weigh 10 g of hydroxylamine hydrochloride, dissolve it in water, dilute to 100 mL, shake well, and transfer to a brown bottle.
Store at 2℃~8℃.
4.2.4 Acetate buffer solution. Weigh 8.3 g of anhydrous sodium acetate, dissolve it in water, add 12 mL of glacial acetic acid, and dilute with water to the specified concentration.
100mL, shake well.
4.2.5 o-Phenanthroline solution (1 g/L). Weigh 0.1 g of o-Phenanthroline and dissolve it in 80 mL of water at 80 °C. After cooling, dilute to 100 mL and shake.
Mix well, transfer to a brown bottle, and store at 2℃~8℃.
4.3 Instruments and Equipment
4.3.1 Analytical balance. accuracy 0.0001g.
4.3.2 Spectrophotometer. with 1cm cuvette.
4.4 Samples
4.4.1 Sampling
4.4.1.1 The samples required for this method shall be collected and prepared separately.
4.4.1.2 Sampling at the production site. Sampling is usually done at the packaging area. A specific production batch is selected as the test batch. Production is then carried out based on this batch.
The time interval for each sampling is calculated according to equal time intervals. After the equipment is running stably, 10 samples are randomly selected manually or mechanically.
Each sample should weigh between 50g and 100g. No stirring or mixing should occur during sampling.
Note. If the mixing performance of the mixer is to be measured, a sample should be taken at the discharge port of the mixer.
4.4.1.3 Product Sampling After Packaging. Select a specific packaging batch as the test batch. Based on the total number of packaging bags in that batch, randomly select...
Ten samples were drawn from ten packaging bags, each weighing between 50g and 100g. During sampling, each sample was drawn from a single point, and should not be...
There was no stirring or mixing.
4.4.2 Sample Preparation
Implement in accordance with the provisions of GB/T 20195.
4.5 Test Procedure
Accurately weigh 1g to 10g of the sample (accurate to 0.0001g) into a 250mL beaker, moisten with a small amount of water, and slowly add 20mL of salt.
Add acid (4.2.2), shake well, add 50 mL of water, stir well, transfer to a 250 mL volumetric flask, dilute to volume with water, shake well, and filter. Based on the sample...
The iron content was further diluted to achieve an iron concentration of 15 μg/mL in the sample solution. 2 mL of the solution was accurately transferred to a 25 mL volumetric flask.
Add 1 mL of hydroxylamine hydrochloride solution (4.2.3), mix thoroughly, and after 5 min, add 5 mL of acetate buffer solution (4.2.4), shake well, and then add...
Add 5 mL of o-phenanthroline solution (4.2.5), dilute with water to 25 mL, mix thoroughly, let stand for 30 min, and use a reagent blank as a reference to analyze the sample using spectrophotometry.
The absorbance of the test solution was measured at a wavelength of 510 nm using a photometer. This procedure was then followed to measure the absorbance of 10 samples from the same batch.
Values A1, A2, A3, A4A10.
If the absorbance value exceeds 0.2~0.8, the test should be repeated.
4.6 Experimental Data Processing
4.6.1 Absorbance value per unit mass
Based on the linear relationship between the iron content in the test solution and its absorbance value, the following calculations are expressed in terms of absorbance value Xi per unit mass.
The absorbance value Xi per unit mass of the sample is calculated according to formula (1).
Xi=
Ai
mi
(1)
In the formula.
Ai --- the absorbance value of the i-th test solution;
mi --- the mass of the i-th sample, in grams (g).
4.6.2 Average absorbance value per unit mass
The average absorbance value per unit mass of the sample, X, is calculated according to formula (2).
X=
(X1 X2 X3 X10)
(2)
In the formula.
X1X10 --- Absorbance values per unit mass of 10 samples.
4.6.3 Standard deviation of absorbance value per unit mass
The standard deviation S of the absorbance per unit mass of the sample is calculated according to formula (3).
S=
(X1-X)2 (X2-X)2 (X3-X)2 (X10-X)2
10-1
(3)
In the formula.
X1X10 --- Absorbance values per unit mass of 10 samples;
X --- The average absorbance value per unit mass of 10 samples.
4.6.4 Mixing uniformity value
The mixing uniformity value is expressed as the coefficient of variation (CV) of the absorbance value per unit mass of the same batch of samples.
The coefficient of variation (CV) of the absorbance per unit mass of 10 samples, expressed as a percentage, is calculated according to formula (4).
CV=
×100 (4)
In the formula.
S --- the standard deviation of absorbance values per unit mass of 10 samples;
X---The average absorbance value per unit mass of 10 samples.
The calculation result is rounded to two decimal places.
5.Atomic Absorption Spectroscopy
5.1 Principle
The copper content was determined by atomic absorption spectrometry, and the coefficient of variation of copper content in the same batch of samples was used to reflect the mixing of the tested products.
Uniformity.
5.2 Samples
Same as 4.4.
5.3 Test Procedure
The copper content (w1, w2, w3, w4, w10) in 10 samples was determined according to GB/T 13885.
5.4 Experimental Data Processing
5.4.1 Average Copper Content
The average copper content, w, expressed in milligrams per kilogram (mg/kg) or grams per kilogram (g/kg), is calculated according to formula (5).
w=
(w1 w2 w3 w10)
(5)
In the formula.
w1w10 --- The copper content of 10 samples, expressed in milligrams per kilogram (mg/kg) or grams per kilogram (g/kg).
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GB/T 10649-2025: Determination of mixing homogeneity for trace mineral premix
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