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NY/T 2272-2012

Chinese Standard: 'NY/T 2272-2012'
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Detail Information of NY/T 2272-2012; NY/T2272-2012
Description (Translated English): Soil amendment. Determination of calcium, magnesium and silicon content
Sector / Industry: Agriculture Industry Standard (Recommended)
Classification of Chinese Standard: B10
Classification of International Standard: 65.080
Word Count Estimation: 11,134
Quoted Standard: HG/T 2843; NY/T 887
Drafting Organization: National Fertilizer Quality Supervision and Inspection Center (Beijing)
Administrative Organization: Ministry of Agriculture
Regulation (derived from): Ministry of Agriculture Bulletin No. 1878
Summary: This standard specifies the soil conditioner calcium, magnesium, Test Method for Determination of silicon content. This standard applies to soil conditioner calcium, magnesium, silicon content.

NY/T 2272-2012
ICS 65.080
B 10
NY
AGRICULTURAL INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Soil amendment – Measurement of calcium,
magnesium, and silicon content
土壤调理剂 钙, 镁, 硅含量的测定
ISSUED ON. DECEMBER 24, 2012
IMPLEMENTED ON. JANUARY 01, 2013
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 Measurement of calcium content ... 4 
4 Measurement of magnesium content ... 10 
5 Measurement of silicon content - Plasma emission spectrometric method15 
Foreword
This standard was drafted in accordance with the provisions of GB/T 1.1.
This standard was proposed by AND shall be under the jurisdiction of the
Ministry of Agriculture of the People's Republic of China.
The drafting organizations of this standard. National Fertilizer Quality
Supervision and Inspection Center (Beijing).
The main drafters of this standard. Fan Hongli, Sun Mi, Sun Qianfeng, Han
Yansong, Zhang Yue.
Soil amendment – Measurement of calcium,
magnesium, and silicon content
1 Scope
This standard specifies the test methods for the soil conditioner - calcium,
magnesium, AND silicon content measurement.
This standard applies to measurement of soil conditioner - calcium,
magnesium, AND silicon content.
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 Standard.
HG/T 2843 Chemical fertilizer products – Standard volumetric, standard,
reagent and indicator solutions for chemical analysis
NY/T 887 Density testing of liquid fertilizer
3 Measurement of calcium content
3.1 Atomic absorption spectrophotometric method (arbitration method)
3.1.1 Principle
As for calcium of the sample solution, in slightly acidic medium, USE a certain
amount of strontium salt as the release agent, to make it atomization in the
lean combustion air – acetylene flame; the generated atomic vapor absorbs
the characteristic wavelength 422.7 nm light which is emitted from the
calcium hollow cathode lamp, AND absorbance values is directly proportional
to the calcium ground state atomic concentration.
3.1.2 Reagents and materials
The preparation of the reagents, water and solution which are used in this
standard shall, unless otherwise indicated of specifications AND preparation
methods, be in accordance with the provisions of HG/T 2843.
It shall follow the provisions of 3.1.4.2.
3.2.4.3 Drawing of working curve
Respectively PIPETTE 0 mL, 0.50 mL, 1.00 mL, 2.00 mL, 4.00 mL, AND 5.00
mL of calcium standard solution (3.2.2.1) into six 100 mL volumetric flasks;
USE water to make it reach to constant volume; MIX it uniformly. The
calcium’s mass concentration of this standard series solution is respectively 0
μg/mL, 5.0 μg/mL, 10.0 μg/mL, 20.0 μg/mL, 40.0 μg/mL, AND 50.0 μg/mL.
Before measurement, based on the nature of the element to be measured
and the instrument performance, OPTIMIZE the measurement conditions of
argon flow rate, observation height, RF generator power, AND integration
time. Then USE the plasma emission spectrometer, at a wavelength of
317.933 nm, to measure the emission intensity of each standard solution.
USE the calcium’s mass concentration of the standard series solution (μg/mL)
as the abscissa AND the corresponding emission intensity as the ordinate;
DRAW the working curve.
Note. It can, based on the different instrument sensitivities, ADJUST the mass
concentration of the standard series solution.
3.2.4.4 Measurement
USE the sample solution OR the solution which is diluted to certain ratio,
under the same conditions of the standard series solution for measurement
purposes, to measure the emission intensity of calcium; from the working
curve, FIND the corresponding mass concentration of the calcium (μg/mL).
3.2.4.5 Blank test
Except for not adding of sample, the rest steps are same as those described
in 3.2.4.4.
3.2.5 Analysis result presentation
It shall follow the provisions of 3.1.5.
3.2.6 Allowable difference
It shall follow the provisions of 3.1.6.
3.2.7 Conversion of mass concentration
It shall follow the provisions of 3.1.7.
4.1.4 Analysis procedures
4.1.4.1 Sample preparation
With respect to the solid samples, after multiple times of splitting, TAKE out
about 100 g of sample; rapidly GRIND it to the grain which can all pass the
0.50 mm pore size sieve (if the sample is wet, it shall pass through the 1.00
mm pore size sieve); MIX it uniformly; PLACE it in a clean AND dry container;
after the liquid sample is subject to multiple times of shaking, quickly TAKE
out about 100 mL; PLACE it in a clean AND dry container.
4.1.4.2 Sample solution preparation
- Solid sample. WEIGH 0.2 g ~ 3 g of sample (accurate to 0.0001 g);
PLACE into a 250 mL volumetric flask; ADD 150 mL of hydrochloric acid
solution (4.1.2.5) which was pre-heated to 28 °C ~ 30 °C; tightly PLUG
the volumetric flask; SHAKE the volumetric flask to disperse the sample
in the liquid; MAINTAIN the solution temperature at 28 °C ~ 30 °C; USE
the oscillator (4.1.3.2) the frequency of which is set to (180 ± 20) r/min
to oscillate it for 30 min; then TAKE the volumetric flask out; COOL it to
room temperature; USE water to dilute it to the mark; MIX it uniformly;
dry FILTER it; DISCARD the first few milliliters of filtrate; USE the rest
filtrate for measurement.
- Liquid sample. WEIGH 0.2 g ~ 3 g sample (accurate to 0.0001 g); PLACE
it into a 250 mL volumetric flask; USE water to make it reach to constant
volume; MIX it uniformly; dry FILTER it; DISCARD the first few milliliters
of filtrate; USE the rest filtrate for measurement.
4.1.4.3 Drawing of working curve
Respectively PIPETTE 0 mL, 1.00 mL, 2.00 mL, 4.00 mL, 8.00 mL, AND
10.00 mL of magnesium standard solution (4.1.2.4) into six 100 mL
volumetric flasks; respectively ADD 4 mL of hydrochloric acid solution
(4.1.2.1) AND 10 mL of strontium chloride solution (4.1.2.2); USE water to
make it reach to constant volume; MIX it uniformly. The magnesium’s mass
concentration of this standard series solution is respectively 0 μg/mL, 1.00
μg/mL, 2.00 μg/mL, 4.00 μg/mL, 8.00 μg/mL, AND 10.00 μg/mL. Under the
selected optimum working conditions, at the wavelength of 285.2 nm, USE
the lean combustion air – acetylene flame; and USE the magnesium content
0 standard solution as the reference solution to set zero, in order to measure
the absorbance value of each standard solution. USE the magnesium’s mass
concentration of the standard series solution (μg/mL) as the abscissa AND
the corresponding absorbance value as the ordinate; DRAW the working
curve.
USE the sample solution OR the solution which is diluted to certain ratio,
under the same conditions of the standard series solution for measurement
purposes, to measure the emission intensity of magnesium; from the working
curve, FIND the corresponding mass concentration of the magnesium
(μg/mL).
4.2.4.5 Blank test
Except for not adding of sample, the rest steps are same as the sample
solution measurement.
4.2.5 Analysis result presentation
It shall follow the provisions of 4.1.5.
4.2.6 Allowable difference
It shall follow the provisions of 4.1.6.
4.2.7 Conversion of mass concentration
It shall fo......
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