GB/T 15063-2020 English PDF (GBT15063-2020)

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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 c...