GB/T 13884-2018 PDF English (GB/T 13884-2003: Older version)
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Determination of cobalt in feeds -- Atomic absorption spectrometry
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| GB/T 13884-2003 | English | 199 |
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Determination of cobalt in feed -- Atomic absorption spectroscopy
| Obsolete |
| GB/T 13884-1992 | English | 199 |
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Determination of cobalt in feed
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PDF Preview: GB/T 13884-2018
GB/T 13884-2018: PDF in English (GBT 13884-2018) GB/T 13884-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.120
B 46
Replacing GB/T 13884-2003
Determination of Cobalt in Feeds -
Atomic Absorption Spectrometry
ISSUED ON. MAY 14, 2018
IMPLEMENTED ON. DECEMBER 01, 2018
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Principle ... 4
4 Reagents and Materials ... 5
5 Apparatus ... 5
6 Sampling and Sample Preparation ... 6
7 Analysis Procedures ... 6
8 Test Data Processing ... 7
9 Repeatability ... 7
Determination of Cobalt in Feeds -
Atomic Absorption Spectrometry
1 Scope
This Standard specifies using the atomic absorption spectrometry to determine the
cobalt in feeds.
This Standard is applicable to the determination of cobalt in the feed ingredients,
compound feeds, concentrate supplements, concentrated feeds, and feed additive
premix.
This Standard method’s detection limit is of 0.03mg/kg; quantitative limit is of 0.1mg/kg.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 14699.1 Feeding Stuffs – Sampling
GB/T 20195 Animal Feeding Stuffs－Preparation of Test Samples
3 Principle
Perform dry ashing against feed ingredients, compound feed, concentrated feed,
concentrate supplements; dissolve the residue under the acidic conditions; make
constant volume to prepare sample solution; use acid leaching meth od to treat the
feed additive premix; make constant volume to prepare sample solution; introduce the
sample solution into an atomic absorption spectrophotometer; determine the
absorbance at 240.7nm; compare with the absorbance on the corresponding standard
curve; calculate the cobalt content in the feed.
5.7 Magnetic stirrer.
6 Sampling and Sample Preparation
According to the provisions of GB/T 14699.1, take a representative feed sample; down-
sampling by quadruple method; prepare the sample as per GB/T 20195. Smash till all
pass though the 0.45mm sample splitting sieve (4.6); mix evenly, and load into a sealed
container; place for later-use.
7 Analysis Procedures
7.1 Extraction
7.1.1 Treatment of feed ingredients, compound feed, concentrated feed, and
concentrate samples
Take 5g~10g sample (accurate to 0.0001g); place into 50mL porcelain crucible (5.3);
perform small-fire charring on the thermostat controlled electric furnace (5.4); perform
ashing for 2h in the 600°C high temperature furnace (5.2); if there is still a small amount
of carbon particles; titrate the nitric acid (4.2) to wet the residue; continue to perform
ashing in the 600°C high temperature furnace till there is no carbon particles; take out
and cool off; titrate a small amount of water to the residue; wet; then add 5mL of
hydrochloric acid (4.1); add water to 15mL; boiling for 2min~3min, then cool off;
transfer into the proper volume of volumetric flask to make constant volume; filter to
obtain the sample solution for later-use. Meanwhile, prepare the blank solution of the
sample.
7.1.2 Treatment of feed additive premix sample
Take 0.5g~2g of sample (accurate to 0.0001g) into 250mL stoppered conical flask; add
100.00mL of hydrochloric acid solution (4.3); use the magnetic stirrer (5.7) to stir and
extract for 30min; then use centrifuge (5.6) to perform centrifugal separation for 5min
at 5000r/min; take the supernatant liquid as the sample solution; after stirring and
extracting, take the solution obtained by dry filtration as the sample solution;
meanwhile, prepare the blank solution of the sample.
7.2 Determination
Separately take appropriate amount of cobalt standard working solution (4.5.3) and
sample solution (7.1) to introduce into atomic absorption spectrophotometer (5.5);
measure its absorbance at 240.7nm; meanwhile, measure the absorbance of sample
blank solution; the cobalt absorbance in the solution to be tested shall be within the
range of standard curve; if it exceeds the range of standard curve, readjust it and retest.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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