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GB 22548-2017: Feed additive -- Monocalcium phosphate
GB 22548-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.120
B 46
Replacing GB/T 22548-2008
Feed additive - Monocalcium phosphate
饲料添加剂 磷酸二氢钙
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: MAY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test methods ... 5 
5 Inspection rules ... 13 
6 Labeling, packaging, transportation and storage ... 13 
7 Quality warranty period ... 14 
Feed additive - Monocalcium phosphate
1 Scope
This Standard specifies the requirements, test methods, inspection rules and
labeling, packaging, transportation and storage of the feed additive
monocalcium phosphate.
This Standard applies to the feed additive monocalcium phosphate that is
produced by wet-process phosphoric acid.
Molecular formula: Ca(H2PO4)2·H2O
Relative molecular mass: 252.06 (according to the international relative atomic
mass in 2007)
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 601, Chemical reagent. Preparations of reference titration solutions
GB/T 602, Chemical reagent. Preparations of standard solutions for impurity
GB/T 603, Chemical reagent. Preparations of reagent solutions for use in
test methods
GB/T 6003.1-2012, Test sieves. Technical requirements and testing. Part 1:
Test sieves of metal wire cloth
GB/T 6436-2002, Determination of calcium in feed
GB/T 6682-2008, Water for analytical laboratory use. Specification and test
methods
GB 10648, Feed label
GB/T 13079-2006, Determination of total arsenic in feeds
GB/T 13080-2004, Determination of lead in feeds. Method using atomic
absorption spectrometry
water which is specified in GB/T 6682-2008. The standard titration solutions,
impurity standard solutions, preparations and products that are used in the test
are prepared according to the provisions of GB/T 601, GB/T 602 and GB/T 603
when no other regulations are specified.
4.3 Sensory test
The appearance is judged visually under sufficient natural light.
4.4 Identification
4.4.1 Reagents and materials
4.4.1.1 Glacial acetic acid
4.4.1.2 Hydrochloric acid solution: 1+1.
4.4.1.3 Ammonia solution: 1+1.
4.4.1.4 Ammonium oxalate solution: 100 g/L.
4.4.1.5 Silver nitrate solution: 17 g/L.
4.4.2 Identification of calcium ions
Take a small amount, about 0.1 g, of sample; add 5 mL of glacial acetic acid to
dissolve; boil. Filter after cooling; add 5 mL of ammonium oxalate solution to
the filtrate to give a white precipitate. This precipitate is dissolved in a
hydrochloric acid solution.
4.4.3 Identification of phosphate radical
Take a small amount, about 0.1 g, of the sample; dissolve it in 10 mL of water;
add 1 mL of silver nitrate solution to form a yellow precipitate. This precipitate
is soluble in excess ammonia solution and insoluble in glacial acetic acid.
4.5 Determination of total phosphorus content
4.5.1 Method summary
In the acidic medium, the phosphate radical in the test solution all forms a
precipitate with the added quinoxaline ketone precipitant. Calculate the content
by filtration, drying, and weighing.
4.5.2 Reagents and materials
4.5.2.1 Hydrochloric acid solution: 1+1.
4.5.2.2 Nitric acid solution: 1+1.
is previously constant at 180°C ± 5°C to suction-filter the supernatant; use
decantation to wash the precipitate for 5 ~ 6 times. About 20 mL of water shall
be used each time; transfer the precipitate to the glass mortar; continue to use
water to wash for 3 ~ 4 times. Place the glass mortar in an electrically heated
drying oven; bake at 180°C ± 5°C for 45 min; take out and place in a desiccator
to cool to room temperature; weigh.
4.5.5 Result calculation
The total phosphorus content is calculated, in mass fraction of phosphorus (P)
w1, according to Formula (1):
Where:
m1 -- the mass of quinoline phosphomolybdate precipitate that is formed by the
test solution, in grams (g);
m0 -- the mass of quinoline phosphomolybdate precipitate that is formed by the
blank test solution, in grams (g);
m -- sample mass, in grams (g).
0.014 0 -- the conversion coefficient from phosphorus molybdate to phosphorus.
Take the arithmetic mean of the parallel determination results as the
determination result; the absolute difference between the two parallel
determination results shall not be larger than 0.2%.
4.6 Determination of water-soluble phosphorus content
Weigh approximately 0.5 g of the sample, accurate to 0.000 2 g, in a porcelain
(or agate) mortar. Add water to grind; add 25 mL of water each time;
continuously grind for 4 times; transfer all the aqueous solution to a 250 mL
volumetric flask; shake for 30 min (2 times/s); use water to dilute to the mark;
shake well. Dry filtration; discard the initial 20 mL of filtrate; pipette 20 mL of the
filtrate; place it in a 250 mL beaker. The following operations are determined
and calculated according to that which starts from “Add 10 mL of nitric acid
solution...” of 4.5.4.3; perform a blank test at the same time.
4.7 Determination of calcium content
4.7.1 Method summary
Same as Chapter 10 of GB/T 6436-2002.
4.8.2 Reagents
Same as Chapter 4 of GB/T 13083-2002.
4.8.3 Instruments
Same as Chapter 5 of GB/T 13083-2002.
4.8.4 Analysis steps
4.8.4.1 Preparation of test solution A
Weigh about 0.5 g ~ 1.00 g of sample, accurate to 0.0002 g, in a 100 mL
volumetric flask; add 16 mL of hydrochloric acid solution (1+4); use water to
dilute to the mark; shake well.
4.8.4.2 Determination
Pipette 25 mL of the test solution; place it in a 50 mL volumetric flask; use total
ion buffer solution to dilute to the mark; shake well. Determine and calculate
according to Chapter 7 of GB/T 13083-2002.
4.9 Determination of arsenic content
4.9.1 Method summary
Same as Chapter 5.1 of GB/T 13079-2006.
4.9.2 Reagents
Same as Chapter 5.2 of GB/T 13079-2006.
4.9.3 Instruments
Same as Chapter 5.3 of GB/T 13079-2006.
4.9.4 Analysis steps
4.9.4.1 Preparation of test solution B
Weigh 2.0 g ~ 5.0 g of sample, accurate to 0.000 2 g; add 20 mL of hydrochloric
acid solution (1+1); heat to dissolve; cool; place in a 250 mL volumetric flask;
add water to dilute to the mark; shake well; dry filter. This filtrate is test solution
B, which is for the determination of arsenic, lead, cadmium and chromium
contents.
4.9.4.2 Determination
Take the arithmetic mean of the parallel determination results as the
determination result; the absolute difference between the two parallel
determination results shall not be larger than 0.5%.
4.14 Determination of fineness
4.14.1 Instruments and apparatuses
Test sieve (in accordance with GB/T 6003.1-2012): R40/3 series φ200 mm × 50
mm × 0.5 mm.
4.14.2 Analysis steps
Weigh 20.0 g of the sample, accurate to 0.01 g, on a test sieve for sieving;
weigh the sieved material.
4.14.3 Result calculation
The fineness is calculated, in mass fraction w4, according to Formula (4):
Where:
m1 -- the mass of the sieved material, in grams (g);
...