GB/T 13088-2006 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13088-2006 | English | 70 |
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Determination of chromium in feeds
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| GB/T 13088-1991 | English | 199 |
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Method for determination of chromium in feeds
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GB/T 13088-2006: Determination of chromium 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/GBT13088-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.120
B 46
Replacing GB/T 13088-1991
Determination of chromium in feeds
Issued on. JUNE 09, 2006
Implemented on. SEPTEMBER 01, 2006
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Method 1.Atomic absorption spectrometry... 4
4 Method 2.Spectrophotometry... 9
Foreword
This Standard is a revision to GB/T 13088-1991 "Method for determination of
chromium in feeds".
Compared with GB/T 13088-1991, the main technical differences in this Standard are
as follows. the atomic absorption spectrometry method for the determination of
chromium in feed is added and determined as the arbitration method. At the same time,
the original spectrophotometry is remained.
This Standard replaces GB/T 13088-1991 from the date of implementation.
This Standard was proposed by and shall be under the jurisdiction of National Technical
Committee on Feed Industry of Standardization Administration of China.
The drafting organizations of this Standard. Chinese Academy of Agricultural Sciences
Animal Husbandry Research Institute, Chinese Academy of Agricultural Sciences Feed
Research Institute.
Main drafters of this Standard. Gu Xianhong, Li Wenying, Zhang Ping.
Version of standard substituted by this Standard is.
- GB/T 13088-1991.
Determination of chromium in feeds
1 Scope
This Standard specifies two methods for the determination of chromium content in feed
by atomic absorption spectrometer and spectrophotometer.
Method 1 of this Standard is atomic absorption spectrometry. It is applicable to feed
raw materials (including leather powder for feed, hydrolyzed leather powder), trace
element premixes, compound premixes, concentrates and compound feeds. The
minimum detection limit of graphite furnace atomic absorption spectrometry is 0.005
μg/kg. The minimum detection limit of flame atomic absorption spectrometry is 150
μg/kg. Method 2 of this Standard is spectrophotometric method. It is applicable to the
determination of chromium in feed raw materials (including hydrolyzed leather powder)
and compound feed.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 6682, Water for analytical laboratory use - Specification and test methods
(neq ISO 3696)
GB/T 14699.1, Feeding stuffs - Sampling
3 Method 1.Atomic absorption spectrometry
3.1 Principle
The sample is ashed at high temperature. After dissolving with acid, inject it into the
atomic absorption spectrometer detector. In a certain concentration range, its absorption
value is proportional to the chromium content. Compare with the standard series to
quantify.
3.2 Reagents and solutions
Unless otherwise specified, the reagents used in Method 1 are guaranteed reagents; the
water is ultrapure water or water of corresponding purity, which meets the requirements
of GB/T 6682 for grade one water.
3.3 Instruments and equipment
All glassware and crucibles are immersed in nitric acid solution (3.2.3) for 24 h or
longer. User pure water to rinse. Dry in the air.
3.3.1 Experimental sample grinder or mortar (chromium-free).
3.3.2 Ultrapure water device (Millipore).
3.3.3 Analytical balance. resolution is 0.0001 g.
3.4 Specimen preparation
According to GB/ T 14699.1, collect about 2 kg of representative feed raw materials
(including leather powder for feed, hydrolyzed leather powder), mineral element
premix, compound premix, concentrate and compound feed. Use quartering method to
reduce it to about 250 g. Grind and pass through the 1 mm hole sieve. Mix well. Put in
an airtight container. In order to prevent the specimen from deteriorating, it should be
stored at low temperature for later use.
3.5 Analysis steps
3.5.1 Preparation of specimen solution
Weigh 0.1 g ~ 10.0 g of specimen (accurate to 0.0001 g). Place in the 60 mL porcelain
crucible. Perform complete carbonization on the electric furnace. Place in the muffle
furnace. Starting from room temperature, gradually increase the temperature to 600°C
for 5 h, until the specimen is white or off-white without carbon particles.
3.5.2.2 Standard curve drawing
3.5.2.2.1 Flame method
Pipette 0.00 mL, 1.25 mL, 2.50 mL, 5.00 mL, 10.00 mL, 20.00 mL of chromium
standard solution 1 (3.2.4.2). Respectively place them in 20 mL volumetric flasks. Add
nitric acid solution (3.2.2) to dilute to the scale. Mix well. Make them standard working
solutions. Each milliliter of solution in the volumetric flask is equivalent to 0.00 μg,
1.25 μg, 2.50 μg, 5.00 μg, 10.00 μg, and 20.00 μg of chromium, respectively.
3.6 Result calculation
3.6.1 Flame method
The content X1 of chromium in feed, expressed in mass fraction micrograms per gram
(μg/g), is calculated according to formula (1).
3.7 Repeatability
The same analyst performs two measurements on the same specimen simultaneously or
in rapid succession. The relative deviation of the obtained results.
4 Method 2.Spectrophotometry
4.1 Principle
Decompose the sample by dry ashing. Chromium ions in it are oxidized to hexavalent
chromium ions in alkaline potassium permanganate solution. Adjust the solution acidic
again. Make hexavalent chromium ion (Cr6+) and diphenylcarbazide
[(C6H5)2·(NH)4·CO] to generate rose red chromium compound. Perform colorimetric
measurement. Calculate the chromium content.
4.2 Reagents and solutions
Unless otherwise specified, the reagents used in this Method 2 are analytically pure; the
water is distilled water or water of corresponding purity, which conforms to the
provisions of GB/T 6682 for grade three water.
4.3 Instruments and equipment
4.3.1 Analytical balance. the resolution is 0.0001 g.
4.3.2 High temperature electric furnace (muffle furnace).
4.3.3 Experimental sample grinder or mortar.
4.3.4 Temperature-controlled electric hob. 600 W.
4.3.5 Volumetric flasks. 50 mL, 100 mL, 200 mL, 1000 mL.
4.3.6 Pipettes. 0.5 mL, 1.0 mL, 5.0 mL, 10.0 mL.
4.3.7 Transfer pipettes. 5 mL, 10 mL, 25 mL.
4.3.8 Erlenmeyer flask. 150 mL.
4.3.9 Short-necked funnel. 6 cm in diameter.
4.5 Determination steps
4.5.1 Specimen processing
Weigh 1.0 g ~ 1.5 g of specimen (accurate to 0.0001 g). Place in a 60 mL porcelain
crucible. After the carbonization in the temperature-controlled electric furnace is
complete, place it in the muffle furnace. Starting from room temperature, gradually
increase the temperature to 600°C for 5 h until the specimen is white or off-white
without carbon particles.
4.6 Determination result
The chromium content in feeds, expressed as mass fraction milligrams per kilogram
(mg/kg), is calculated according to formula (3).
4.7 Repeatability
The same analyst performs two measurements on the same specimen simultaneously or
in rapid succession. The relative deviation of the obtained results.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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