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NY 525-2012: Organic fertilizer
NY 525-2012
NY
AGRICULTURAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 65.080
B 10
Replacing NY 525-2011
Organic fertilizer
ISSUED ON. MARCH 1, 2012
IMPLEMENTED ON. JUNE 1, 2012
Issued by. Ministry of Agriculture of the People’s Republic of China
Table of Contents
Foreword . 3 
1 Scope .. 4 
2 Normative References . 4 
3 Terms and definitions .. 5 
4 Requirements .. 5 
5 Test methods .. 6 
6 Inspection rules .. 18 
7 Packaging, marking, transportation and storage . 19 
Organic fertilizer
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
marking, packaging, transportation and storage of organic fertilizer.
This Standard applies to organic fertilizer, which is made through fermentation using
the materials processed from excrements of livestocks, residues of plant and animal
and products of plant and animal as raw materials.
This Standard does not apply to green manures, farmyard manures and other organic
fertilizers collected and made by farmers.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to This Standard.
GB/T 601, Chemical reagent - Preparations of standard volumetric solutions
GB/T 6679, General rules for sampling solid chemical products
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 8576, Determination of free water for compound fertilizers - Vacuum oven
method
GB 18382, Fertilizer marking - Presentation and declaration
GB 18877, Organic-inorganic compound fertilizers
GB/T 19524.1, Determination of fecal coliforms in fertilizers
GB/T 19524.2, Determination of mortality of ascarid egg in fertilizers
HG/T 2843, Chemical fertilizer Products - Standard volumetric, standard, reagent
and indicator solutions for chemical analysis
Weigh 39.23 g of potassium dichromate (analytically pure); use a small amount of
water to dissolve; transfer to a 1 L volumetric flask; dilute to scale; and shake up as
standby.
5.2.3.5 Ferrous sulfate (FeSO4) standard solution. c(FeSO4) = 0.2 mol/L.
Weigh 55.6 g of (FeSO4·7H2O) (analytically pure); dissolve in 900 mL of water; add 20
mL of sulfuric acid (5.2.3.2) to dissolve; dilute to 1 L; and shake up as standby (filter if
necessary). The accurate concentration of the solution is calibrated using 0.1 mol/L
potassium dichromate standard solution (5.2.3.3); and carry out calibration
immediately prior to use.
The calibration of c(FeSO4) = 0.2 mol/L standard solution. absorb 20.00 mL of
potassium dichromate standard solution (5.2.3.3) to add to a 150 mL triangular flask;
add 3 mL ~ 5 mL of sulfuric acid (5.2.3.2) and 2 drops ~ 3 drops of phenanthroline
indicator (5.2.3.6); and use ferrous sulfate standard solution (5.2.3.5) for titration.
Based on the consumption of ferrous sulfate standard solution at the time of titration,
calculate its accurate concentration c in accordance with Equation (1).
where,
c1 -- concentration of potassium dichromate standard solution, in mol/L;
V1 -- volume of potassium dichromate standard solution absorbed, in mL;
V2 -- volume of ferrous sulfate standard solution at the time of titration, in mL.
5.2.3.6 Phenanthroline indicator
Weigh 0.695 g of ferrous sulfate (analytically pure) and 1.485 g of phenanthroline
(analytically pure) to dissolve in 100 mL of water; and shake up as standby. The
indicator is perishable, so it shall be sealed and stored in a brown bottle.
5.2.4 Determination procedures
Weigh 0.2 g ~ 0.5 g (accurate to 0.000 1 g) of air-dried sample that has been screened
through Mesh Φ 1 mm; place in a 500 mL triangular flask; accurately add 50.0 mL of
0.8 mol/L potassium dichromate solution (5.2.3.4); then add 50.0 mL of concentrated
sulfuric acid (5.2.3.2); add a bent neck small funnel; place in boiling water; and
maintain for 30 min after water is boiling. Take out and cool to room temperature; use
water to rinse the small funnel; and contain the washings into the triangular flask. Take
down the triangular flask; transfer the reactant nondestructively into a 250 mL
volumetric flask; cool to room temperature; add dropwise to scale; absorb 50.0 mL of
the solution to pour into a 250 mL triangular flask; add water approximately to 100 mL;
add 2 drops ~ 3 drops of phenanthroline indicator (5.2.3.6); use 0.2 mol/L ferrous
sulfate standard solution (5.2.3.5) to titrate to the end when the solution turns from
certain acidity, the phosphate anions in the solution to be tested reacts with
metavanadic acid and molybdic acid to generate yellow ternary heteropoly acid. Within
a certain concentration range [1 mg/L ~ 20 mg/L], the absorbance and the phosphorus
content of the yellow solution are in a direct proportion relationship; and then use the
spectrophotometric method to quantify phosphorus.
5.4.2 Reagents
5.4.2.1 Sulfuric acid (ρ1.84).
5.4.2.2 Nitric acid.
5.4.2.3 30% hydrogen peroxide.
5.4.2.4 Vanadium ammonium molybdate reagent.
Solution A. weigh 25.0 g of ammonium molybdate to dissolve in 400 mL of water.
Solution B. weigh 1.25 g of ammonium metavanadate to dissolve in 300 mL of boiling
water; add 250 mL of nitric acid (5.4.2.2) after cooling; and cool.
Inject solution A slowly into solution B while stirring; use water to dilute to 1 L; mix up;
and store in a brown bottle.
5.4.2.5 Sodium hydroxide solution. a solution of mass concentration 10%.
5.4.2.6 Sulfuric acid (5.4.2.1). a solution of volume fraction 5%.
5.4.2.7 Phosphoric acid solution. 50 μg/mL.
Weigh 0.219 5 g of potassium dihydrogen phosphate (standard reagent) dried for 2 h
at 105°C; transfer to a 1 L volumetric flask after using water to dissolve; add 5 mL of
sulfuric acid (5.4.2.1); and use water to add to scale after cooling. 1 mL of the solution
contains 50 μg of phosphorus (P).
5.4.2.8 2,4-(or 2,6-) dinitrophenol indicator. a solution of mass concentration 0.2%.
5.4.2.9 Non-phosphorus filter paper.
5.4.3 Apparatus
Commonly-used laboratory apparatus and spectrophotometer.
5.4.4 Analytical procedures
5.4.4.1 Preparation of sample solution
Prepare as specified in 5.3.4.1.
5.4.4.2 Preparation of blank solution
5.5.3 Apparatus
Commonly-used laboratory apparatus and flame-photometer.
5.5.4 Analytical procedures
5.5.4.1 Preparation of sample solution
Prepare as in 5.3.4.1.
5.5.4.2 Preparation of blank solution
Except that no sample is added, the reagents used and operation are the same as in
5.4.4.1.
5.5.4.3 Plotting of standard curve
Absorb 0 mL, 1.00 mL, 2.50 mL, 5.00 mL, 7.50 mL and 10.00 mL of potassium standard
solution (5.5.2.4) to pour into six 60 mL volumetric flasks respectively; add blank
solution of an equal volume to that of sample solution absorbed; and add water to scale.
The solutions are the standard solution series, 1 mL of which contains 0 μg, 2.00 μg,
5.00 μg, 10.00 μg, 15.00 μg and 20.00 μg of potassium (K). On the flame-photometer,
use blank solution to adjust the apparatus to zero point and use the standard solution
of maximum concentration in the standard solution series to adjust the full scale to 80
scale mark. Then measure other standard solutions in turn from low concentration to
high concentration; and record the indicating values of the apparatus. Plot the standard
curve or calculate the linear regression equation in accordance with the potassium
concentration and apparatus indicating values.
5.5.4.4 Determination
Absorb 5.00 mL of sample solution (5.5.4.1) to pour into a 50 mL volumetric flask; and
add water to scale. Carry out determination on a flame-photometer under the same
conditions as the standard solution series; and record the apparatus indicating values.
Use potassium standard solution to calibrate the apparatus after testing every 5
samples.
5.5.5 Expression of analysis results
The potassium content of fertilizer is expressed using the mass fraction of fertilizer and
calculated in accordance with Equation (5).
where,
c3 -- potassium concentration of solution to be determined which is obtained from the
standard curve or regression equation, in μg/mL;
phosphate (KH2PO4) dried for 2 h at 120°C and 3.53 g of anhydrous disodium
hydrogen phosphate (Na2HPO4) dried for 2 h at 130°C; use water to dissolve; and
dilute and add to 1 L.
5.7.3.3 pH 9.18 standard buffer solution. weigh 3.8 g of borax (Na2B4O7·10H2O)
(which is balanced for one week in a desiccator containing cane sugar-salt solution);
use water to dissolve; and dilute and add to 1 L.
5.7.4 Operating procedures
Weigh 5.0 g of air-dried sample screened through Mesh Φ 1 mm to place into a 100
mL beaker; add 50 mL of water (boiled to remove carbon dioxide); stir for 15 min; allow
to stand for 30 min; and use a pH meter to determine.
5.7.5 Admissible differences
Take the arithmetic mean value of parallel determination results as the final analysis
result, rounded off to the first decimal place. The absolute differences between parallel
analysis results shall not be greater than 0.2 pH unit.
5.8 Determination of heavy metals
5.8.1 Proceed as specified in GB 18877.
5.8.2 Expression of analysis results
The heavy metal content of fertilizer is expressed using the mass fraction of fertilizer
ω (mg/kg) and calculated in accordance with Equation (6).
where,
ρ -- heavy metal concentration of solution to be determined which is obtained from the
standard curve or regression equation, in μg/mL;
ρ0 -- heavy metal concentration of blank solut...