GB/T 13082-2021 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13082-2021 | English | 170 |
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Determination of cadmium in feeds
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| GB/T 13082-1991 | English | 70 |
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Method for determination of cadmium in feeds
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GB/T 13082-2021: Determination of cadmium in feeds---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/GBT13082-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.120
CCS B 46
Replacing GB/T 13082-1991
Determination of cadmium in feeds
Issued on. NOVEMBER 26, 2021
Implemented on. JUNE 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Principles... 4
5 Reagents or materials... 5
6 Instruments and equipment... 6
7 Samples... 6
8 Test procedures... 7
9 Processing of test data... 10
10 Precision... 11
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 13082-1991 "Determination of cadmium in feeds".
Compared with GB/T 13082-1991, except for structural adjustment and editorial
changes, the main technical changes are as follows.
a) CHANGE the scope of application of the method, adding the detection limit and
quantification limit of graphite furnace atomic absorption spectrometry and flame
atomic absorption spectrometry (see Chapter 1; Chapter 1 of the 1991 edition);
b) CHANGE the principle of the method (see Chapter 4; Chapter 2 of the 1991
edition);
c) ADD the preparation method of the sample solution (see 8.1.2 and 8.1.3);
d) CHANGE the test data processing of atomic absorption spectrometry (see 9.1, 9.2;
7.1 of the 1991 edition);
e) CHANGE the expression of precision (see 10.1, 10.2; 7.3 of the 1991 edition).
Please note that some content of this document may be patented. The issuing agency of
this document assumes no responsibility for identifying patents.
This document was proposed by AND shall be under the jurisdiction of the National
Standardization Technical Committee of Feed Industry (SAC/TC 76).
Drafting organizations of this document. Institute of Agricultural Quality Standards and
Testing Technology, Chinese Academy of Agricultural Sciences.
The main drafters of this document. Jia Zheng, Xu Siyuan, Tian Jing, Fan Xia, Xiao
Zhiming, Lu Mei, Zhang Xiao, Li Yang, Li Lan, Liu Xiaolu.
This standard replaces the standard previously issued as follows.
- It was first released in 1991 as GB/T 13082-1991;
- This is the first revision.
Determination of cadmium in feeds
1 Scope
This document describes flame atomic absorption spectrometry and graphite furnace
atomic absorption spectrometry, for the determination of cadmium in feed.
This document applies to the determination of cadmium, in compound feeds,
concentrated feeds, concentrate supplements, additive premixed feeds, feed additives,
feed ingredients.
In this document, when the sampling amount is 5 g and the constant volume is 50 mL,
the detection limit of flame atomic absorption spectrometry is 0.08 mg/kg AND the
quantification limit is 0.20 mg/kg. When the sampling amount is 0.5 g and the constant
volume is 25 mL, the detection limit of graphite furnace atomic absorption spectrometry
is 0.002 mg/kg AND the quantification limit is 0.05 mg/kg.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB 6819-2004 Dissolved acetylene
GB/T 20195 Animal feeding stuffs - Preparation of test samples
3 Terms and definitions
There are no terms and definitions, that need to be defined in this document.
4 Principles
After dry ashing or wet digestion (microwave digestion), or hydrochloric acid
dissolution, the specimen is introduced into the flame or graphite furnace atomizer of
atomic absorption spectrophotometer, to measure the absorbance value at a wavelength
of 228.8 nm.
5 Reagents or materials
Warning. When using various strong acids, it shall be carried out in a fume hood;
when using perchloric acid for digestion, be careful not to burn it dry, to prevent
explosion.
5.1 Water. GB/T 6682, grade 1.
5.2 Nitric acid. Excellent grade pure.
5.3 Hydrochloric acid. Excellent grade pure.
5.8 Palladium nitrate solution (2 mg/mL). Weigh 0.20 g of palladium nitrate. Use water
to dissolve it. Dilute it to 100 mL. Mix well.
5.9 Ammonium dihydrogen phosphate solution (10 mg/mL). Weigh 1.00 g of
ammonium dihydrogen phosphate. Use water to dissolve it. Dilute it to 100 mL. Mix
well.
5.10 Cadmium standard stock solution (1 mg/mL). Accurately weigh 1.0000 g of metal
cadmium (certified reference material, purity 99.99%), into a 250 mL conical flask. Add
10 mL of nitric acid solution (5.7). Heat on an electric hot plate, to dissolve all.
5.11 Cadmium standard intermediate solution I (10 μg/mL). Accurately pipette 1 mL of
cadmium standard stock solution (5.10), into a 100 mL volumetric flask. Use nitric acid
solution (5.6), to dilute it to the mark. Mix well. The valid period is 1 month.
5.14 Cadmium standard series solution II.
6 Instruments and equipment
6.1 Atomic absorption spectrophotometer. It is equipped with flame/graphite furnace
atomizer and cadmium hollow cathode lamp.
6.2 Analytical balance. Sensitivity is 0.0001 g and 0.01 g.
6.6 Adjustable electric heating plate or adjustable electric furnace. The temperature
range is 100 °C ~ 400 °C; the accuracy is ±5 °C.
6.7 Microwave digester. It is equipped with PTFE digestion tank.
7 Samples
Prepare samples according to GB/T 20195, at least 200 g. Pulverize them, so that they
all pass through an analytical sieve, which has an aperture of 0.425 mm.
8 Test procedures
8.1 Preparation of specimen solution
8.1.1 Dry ashing method
It is suitable for compound feed, concentrated feed, concentrate supplement, pre-mixed
feed containing organic matter additives, feed additives, feed raw materials.
8.1.2 Wet digestion method
It is suitable for additive premixed feed which contain more organic matter, feed
additives, feed raw materials.
8.1.3 Microwave digestion
It is suitable for compound feed, concentrated feed, concentrate supplement, pre-mixed
feeds which contain organic matter additives, feed additives, feed raw materials.
8.1.4 Hydrochloric acid dissolution method
It is suitable for mineral feed ingredients and mineral element feed additives.
Do two tests in parallel. Weigh 0.5 g ~ 2 g of specimen (accurate to 0.0001 g), into a
150 mL conical flask. Add 2 mL of water to wet the specimen. Take 10 mL of
hydrochloric acid solution (5.5). Add it dropwise to the conical flask.
8.3 Determination
8.3.1 Flame atomic absorption spectroscopy
Set the instrument to the background deduction mode. Adjust it to the best working
state. Set the zero point, by water or the zero point of the curve. Measure the absorbance
value of the blank solution, the cadmium standard series solution I (5.13), the specimen
solution, in turn at the characteristic wavelength of cadmium element at 228.8 nm.
8.3.2 Graphite furnace atomic absorption spectrometry
Set the instrument to the background deduction mode. Adjust to the best working state.
At the characteristic wavelength of cadmium element at 228.8 nm, inject 10 μL of test
solution, 5 μL of palladium nitrate solution (5.8), 5 μL of ammonium dihydrogen
phosphate solution (5.9), into the graphite furnace, (the optimal injection volume can
be determined, according to the instrument used), to measure the absorbance values of
the blank solution, the cadmium standard series solution II (5.14),
9 Processing of test data
9.1 Flame atomic absorption spectroscopy
The content w of cadmium in the specimen is calculated in mass fraction, the unit is
milligram per kilogram (mg/kg); it is calculated according to formula (1).
10 Precision
10.1 Flame atomic absorption spectroscopy
Under the conditions of repeatability, the ratio d -- of the absolute difference between
the obtained two independent determination results and their arithmetic mean value TO
the arithmetic mean value -- shall meet the requirements of Table 4.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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