GB/T 15063-2020 English PDF (GB/T15063-2020)

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GB/T 15063-2020: Compound fertilizer
GB/T 15063-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.080
G 21
Replacing GB/T 15063-2009
Compound fertilizer
复合肥料
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions... 6 
4 Technical requirements ... 7 
5 Sampling ... 8 
6 Test methods ... 10 
7 Inspection rules ... 13 
8 Identification and quality certificate ... 14 
9 Packaging, transportation, storage ... 15 
Appendix A (Normative) Determination of available phosphorus content in compound
fertilizers - Quinoline phosphomolybdate gravimetric method ... 17 
Appendix B (Normative) Determination of chloride ion content in compound fertilizers
- Automatic potentiometric titration ... 21 
Appendix C (Normative) Determination of available calcium and available magnesium
content in compound fertilizer - Plasma emission spectrometry ... 24 
Compound fertilizer
1 Scope
This standard specifies the terms and definitions, technical requirements, sampling, test
methods, inspection rules, marking and quality certificates, packaging, transportation,
storage of compound fertilizers.
This standard applies to compound fertilizers (including ternary or binary solid
fertilizers, which use nitrogen, phosphorus, potassium as basic nutrients, under various
names). This standard does not apply to compound fertilizer products, such as
monoammonium phosphate and diammonium phosphate.
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) is
applicable to this standard.
GB/T 3597 Fertilizer - Determination of nitrate nitrogen content - Nitron gravimetric
method
GB/T 6274 Fertilizers and soil conditioners - Vocabulary
GB/T 6679 General rules for sampling solid chemical products
GB/T 8170 Rules of rounding off for numerical values and expression and judgement
of limiting values
GB/T 8569 Packing of solid chemical fertilizers
GB/T 8571 Preparation of laboratory samples for compound fertilizers
GB/T 8572-2010 Determination of total nitrogen content for compound fertilizers
titrimetric method after distillation
GB/T 8573 Determination of available phosphorus content for compound fertilizers
GB/T 8574 Determination of potassium content for compound fertilizers -
Potassium tetraphenylborate gravimetric method
5.2 Sample reduction
Quickly mix the collected aggregate sample uniformly. Use a divider or quartering
method, to reduce the sample to about 1 kg. Then divide it into two parts, which are
divided into two clean and dry glass or plastic bottles with ground stoppers (the quality
inspection department of the manufacturer can use a clean and dry plastic Ziplock bag,
to hold the sample). Seal and label it. Indicate the name of the manufacturer, product
name, batch number or production date, sampling date and the name of the sampler.
One bottle is used for product inspection; the other bottle is retained for two month, for
future reference.
6 Test methods
6.1 General provisions
Except for appearance and particle size, make parallel determinations of two sets of
samples. The reagents, solutions, water, which is used in this standard, shall comply
with the provisions of HG/T 2843, when the specifications and preparation methods are
not specified.
6.2 Visual inspection
Use the sample in 5.2, to make inspection visually.
6.3 Total nutrients
6.3.1 Determination of total nitrogen content
6.3.1.1 Method 1: Post-distillation titration (arbitration method)
It is carried out, in accordance with GB/T 8572.
6.3.1.2 Method 2: Automatic analyzer method
After the specimen is prepared, according to the provisions of GB/T 8571 (if the sample
is difficult to pulverize, it can be ground, until it passes through a 1.00 mm aperture test
sieve). It is determined, according to GB/T 22923.
6.3.1.3 Method 3: Dumas combustion method
It is carried out, in accordance with 3.2 of NY/T 1977-2010.
6.3.2 Determination of available phosphorus content and calculation of the
percentage of water-soluble phosphorus in available phosphorus
6.3.2.1 Method 1: Quinoline phosphomolybdate gravimetric method (Arbitration
method)
It is carried out, in accordance with Appendix A.
6.3.2.2 Method 2: Quinoline phosphomolybdate gravimetric method or plasma
emission spectrometry
It is carried out, in accordance with GB/T 8573.
6.3.2.3 Method 3: Automatic analyzer method
After the specimen is prepared, according to the provisions of GB/T 8571 (if the sample
is difficult to pulverize, it can be ground, until it passes through a 1.00 mm aperture test
sieve). It is determined according to GB/T 22923.
6.3.3 Determination of potassium content
6.3.3.1 Method 1: Potassium tetraphenylborate gravimetric method (Arbitration
method)
It is carried out, in accordance with GB/T 8574.
6.3.3.2 Method 2: Automatic analyzer method
After the specimen is prepared, according to the provisions of GB/T 8571 (if the sample
is difficult to pulverize, it can be ground until, it passes through a 1.00 mm aperture test
sieve). It is determined according to GB/T 22923.
6.3.3.3 Method 3: Plasma emission spectrometry
Prepare the specimen solution, according to 4.3.2 of NY/T 2540-2014. Then it is
determined, in accordance with 5.3 of NY/T 2540-2014.
6.3.4 Calculation of total nutrients
Total nutrients are the sum of total nitrogen, available phosphorus, potassium content.
6.4 Determination of nitrate nitrogen content
6.4.1 Method 1: Nitrogen reagent gravimetric method (arbitration method)
After the specimen is prepared, according to the provisions of GB/T 8571 (if the sample
is difficult to pulverize, it can be ground, until it passes through a 1.00 mm aperture test
sieve). Then it is determined, according to GB/T 3597.
6.4.2 Method 2: Automatic analyzer method
After the specimen is prepared, according to the provisions of GB/T 8571 (if the sample
is difficult to pulverize, it can be ground, until it passes through a 1.00 mm aperture test
sieve). Then it is determined, according to GB/T 22923.
7.3.1 The qualification of the product quality indicators, in this standard, shall be
determined, by the "rounding-off value comparison method", in GB/T 8170.
7.3.2 Manufacturers shall carry out the exit-factory inspection and type inspection,
according to the requirements of this standard. When all the inspection items meet the
requirements of this standard, the batch of products is judged to be qualified.
7.3.3 If one of the indicators, in the results of the exit-factory inspection or type
inspection, which is conducted by the manufacturer, does not meet the requirements of
this standard, double amount of samples shall be taken from the same batch of
packaging containers, for inspection. In the re-inspection results, even if there is one
indicator does not meet the requirements of this standard, the batch of products is
judged to be unqualified.
8 Identification and quality certificate
8.1 If the product contains nitrate nitrogen, it shall be marked with "nitrate nitrogen",
on the packaging container.
8.2 When the products, which use the citrate-soluble phosphate fertilizers, such as
calcium-magnesium-phosphate fertilizers, as the basic fertilizer, they shall be marked
as "citrate-soluble phosphorus", in a prominent position of the packaging container.
8.3 For products whose mass fraction of chloride ions is greater than 3.0%, it shall,
according to the "mass fraction of chloride ions" required in 4.2, clearly mark the
Chinese characters "chlorine-contained (low chlorine)", "chlorine-contained (medium
chlorine)", "chlorine-contained (high chlorine)", in prominent positions of the
packaging container, rather than “chlorine", “Cl-contained” or “Cl”, etc. For products,
which are marked with “Chlorine-contained”, it shall not have pictures of chlorine-
sensitive crops on the packaging container, nor shall it have markings such as
"potassium sulfate (type)", "potassium nitrate (type)", "sulfur group", "nitrosulfur
group", which may easily lead users to misunderstand that the product does not contain
chlorine. For products, which have the marking of "chlorine-contained (high chlorine)",
it shall be marked of the warning words that "high chlorine content; improper use will
cause damage to crop and soil".
8.4 For the products, which contain amide nitrogen (urea nitrogen), it shall be marked
with the following warning words, in a prominent position on the packaging container:
"Containing biuret; improper use will cause damage to crops". For products, which are
not marked with this warning, the inspection and testing agency may select a method
for measuring the total nitrogen content for detection and determination, based on the
fact that the product does not contain amide nitrogen (urea nitrogen).
8.5 If medium elements and (or) trace elements are added, the content of each single
element can be indicated separately, according to the medium elements and (or) trace
elements (both are calculated as elemental elements); the content of medium elements
and trace elements shall not be included in the total nutrients. When the content of
available calcium and available magnesium, in a single medium element, is less than
1.0%, the total sulfur content is less than 2.0%, the content of a single trace element is
less than 0.02%, it shall not be marked.
8.6 There shall be warnings, precautions for use, etc., on the outer packaging container
of the product. Some product information, such as production date or batch number,
certificate of conformity, instructions for use, can be marked with easily identifiable
QR codes or barcodes.
8.7 If fertilizer additives, other than the requirements of this standard, are marked on
the product packaging, it shall mark the name, function, content, corresponding testing
method standards of the additives, on the packaging container.
8.8 The marking of nutrient content shall be labelled on the basis of the total material;
the material in the packaging container shall not be separated and labelled separately.
8.9 The net content of each bag shall be marked with a single value, such as 50 kg.
8.10 Each batch of qualified exit-factory products shall be accompanied by a quality
certificate, which includes: manufacturer's name, address, product name, batch number
or date of manufacture, total nutrients, formula or main nutrient content, chloride ion
content, biuret content, this standard number, as well as the content that shall be marked
according to laws and regulations. For the products, which use the citrate-soluble
phosphate fertilizers, such as calcium-magnesium phosphate fertilizers, as the basis, it
shall be marked as "citrate-soluble phosphorus"; meanwhile, it shall indicate whether
they are "nitrate nitrogen", "urea nitrogen", "organic nitrogen". Non-exit-factory
inspection items are marked with the test results of the latest type inspection.
8.11 The rest shall be implemented, in accordance with the provisions of GB 18382.
9 Packaging, transportation, storage
9.1 The product is packaged, by the materials that meet the requirements of GB/T 8569.
The packaging specifications are 1000 kg, 50 kg, 40 kg, 25 kg; the allowable range of
the net content of each bag is (1000 ± 10) kg, (50 ± 0.5) kg, (40 ± 0.4) kg, (25 ± 0.25)
kg; the average net content of each bag of each batch of products shall not be less than
1000 kg, 50.0 kg, 40.0 kg, 25.0 kg. Other packaging specifications, which are agreed
upon by both parties in the contract, can also be used.
9.2 When there are additives in the product, within the stated net content range of each
bag, they shall be mixed with the raw materials evenly; they shall not be put into the
packaging bag, in the form of small packages.
9.3 On the premise of complying with the provisions of GB/T 8569, it should use the
Appendix A
(Normative)
Determination of available phosphorus content in compound fertilizers -
Quinoline phosphomolybdate gravimetric method
A.1 Principle
Water-soluble phosphorus is extracted, by grinding with water or ultrasonically. Use an
alkaline solution of disodium ethylenediaminetetraacetate (EDTA), which has a pH
value between 12.0 and 12.5, to heat and boil it, to extract the available phosphorus in
the compound fertilizer. The extract is boiled with nitric acid solution, for more than 10
min, to completely convert the non-orthophosphate in the test solution into
orthophosphate. In acidic medium, the content of water-soluble phosphorus and
available phosphorus is determined, by quinoline phosphomolybdate gravimetric
method.
A.2 Reagents or materials
A.2.1 Sodium hydroxide solution: 200 g/L.
A.2.2 Disodium ethylenediaminetetraacetate (EDTA) alkaline solution: Weigh 37.5 g
of disodium EDTA. Dissolve it in 1000 mL of water. Mix well. Adjust the pH value to
12.0 ~ 12.5, by sodium hydroxide solution (A.2.1), before use.
A.2.3 Nitric acid solution: 1 + 1.
A.2.4 Quinmolybdenum limonene reagent.
A.3 Instruments and equipment
A.3.1 Usually laboratory instruments are used.
A.3.2 Ultrasonic cleaning instrument: It can control the temperature (30 ± 2) °C.
A.3.3 Electric heating constant temperature drying oven: The temperature can be
controlled at (180 ± 2) °C.
A.3.4 Glass crucible filter: No.4, 30 mL.
A.4 Sample
A.4.1 Specimen preparation
It is carried out, according to the provisions of GB/T 8571 (if the sample is difficult to
pulverize, it can be ground to pass the 1.00 mm aperture test sieve).
A.4.2 Weighing of specimen
Weigh the sample, which contains 100 mg ~ 180 mg of phosphorus pentoxide, from
A.4.1, accurate to 0.0002 g.
A.5 Test procedure
A.5.1 Extraction of water-soluble phosphorus ...