NY/T 1972-2010 PDF English
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Water-soluble fertilizers - Determination of sodium, selenium, silicon content
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NY/T 1972-2010: Water-soluble fertilizers - Determination of sodium, selenium, silicon content---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/NYT1972-2010
ICS 65.080
G 20
NY
AGRICULTURAL INDUSTRY STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Water-soluble fertilizers –
Determination of sodium, selenium, silicon content
Issued on: DECEMBER 23, 2010
Implemented on: FEBRUARY 01, 2011
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 sodium content ... 4
4 Measurement of selenium content – Atomic fluorescence spectrometric
method ... 13
5 Measurement of silicon content - Plasma emission spectrometric method17
Foreword
This standard was drafted in accordance with the provisions of GB/T
1.1-2009.
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), Ministry of Agriculture - Fertilizer
Quality Supervision and Inspection Center (Chengdu), AND Ministry of
Agriculture - Fertilizer Quality Supervision and Inspection Center (Ji’nan).
The main drafters of this standard. Fan Hongli, Sun Youning, Han Yansong,
Liu Mi, Bao Wankui, Song Wenqi, Lu Guiju.
Water-soluble fertilizers –
Determination of sodium, selenium, silicon content
1 Scope
This standard specifies the test methods for the water-soluble fertilizers –
sodium, selenium, AND silicon content measurement.
This standard applies to measurement of liquid OR solid water-soluble
fertilizers – sodium, selenium, 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.
GB/T 8170 Rules of rounding off for numerical values & expression and
judgment of limiting values
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 sodium content
3.1 Flame photometric method
3.1.1 Principle
The sodium atoms in the sample solution are excited by the thermal energy
of the flame; when the excited electron is transited from a higher energy level
to a lower energy level, it can release a certain energy, which will generate
the spectral line of a fixed wavelength; USE the optical system to measure
the radiant energy, in order to obtain the sodium content.
3.1.2 Reagents and materials
WEIGH 0.2 g ~ 3 g sample (accurate to 0.0001 g); PLACE it into a 250mL
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.
3.1.4.3 Drawing of working curve
Respectively PIPETTE 0 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, 5.00 mL,
6.00 mL, AND 7.00 mL of sodium standard solution (3.1.2.2) into eight 100
mL volumetric flasks; USE water to make it reach to constant volume; MIX it
uniformly. The sodium’s mass concentration of this standard series solution
is respectively 0 μg/mL, 1.00 μg/mL, 2.00 μg/mL, 3.00 μg/mL, 4.00 μg/mL,
5.00 μg/mL, 6.00 μg/mL, AND 7.00 μg/mL. On the flame photometer of
selected working conditions, based on the sodium concentration of the
solution to be tested, SELECT six points from the standard series solution;
USE the 0 μg/mL standard solution to adjust the zero point of the instrument;
from low concentration to high concentration, respectively MEASURE the
emission intensity of each standard solution. USE the sodium’s mass
concentration of each standard series solution (μg/mL) as the abscissa AND
the corresponding emission intensity as the ordinate; DRAW the working
curve.
3.1.4.4 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 sodium; from the working
curve, FIND the corresponding mass concentration of the sodium (μg/mL).
3.1.4.5 Blank test
Except for not adding of sample, the rest steps are same as the sample
solution measurement.
3.1.5. Analysis result presentation
The sodium (Na) content w1 is expressed in mass fraction (%), AND
calculated in accordance with the equation (1).
Where.
ρ – The sodium’s mass concentration of the sample solution as found from
the working curve, in the unit of micrograms per milliliter (μg/mL);
3.2.2.2 Cesium chloride solution. ρ (CsCl) = 4 g/L. WEIGH 4 g of cesium
chloride and DISSOLVE it in water; USE water to dilute it to 1 L; MIX it
uniformly.
3.2.2.3 High purity argon.
3.2.3 Instruments
3.2.3.1 Ordinary laboratory instruments;
3.2.3.2 Horizontal reciprocating oscillators OR oscillators with equivalent
functions.
3.2.3.3 Plasma emission spectrometer.
3.2.4 Analysis procedures
3.2.4.1 Sample preparation
With respect to the solid samples, after multiple times of splitting, TAKE out
about 100 g; 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.
3.2.4.2 Sample solution preparation
3.2.4.2.1 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 water; PLACE it into the (25 ± 5) °C
oscillator; under the oscillating frequency of (180 ± 20) r/min, OSCILLATE it
for 30 min; TAKE it out; 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.
3.2.4.2.2 Liquid sample
WEIGH 0.2 g ~ 3 g sample (accurate to 0.0001 g); PLACE it into a 250mL
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.
3.2.4.3 Drawing of working curve
250 – The volume of the sample solution, in the unit of milliliter (mL);
m – The mass of the sample, in the unit of grams (g);
106 – The coefficient used to convert g to μg.
USE the arithmetic mean of the parallel measurement results as the
measurement result, keeping two decimal places.
3.2.6 Allowable difference
The relative difference of the parallel measurement results is not more than
10%;
The relative difference between the measurement results from different
laboratories is not more than 30%.
When the measurement result is less than 0.15%, the relative difference of
the parallel measurement results AND the measurement results from
different laboratories will not be considered.
3.3 Atomic absorption spectrophotometric method
3.3.1 Principle
USE the flame emission method of atomic absorption spectrophotometer to
measure the sodium content. DO not use the sodium hollow cathode lamp.
Under the effect of air – acetylene flame, the sodium in the sample solution is
converted into gaseous atom, AND the atom’s outer layer electrons are
further excited; when the excited electrons are transited from the higher
energy level to the lower energy level, the atom will release the excess
energy to produce the spectral line of characteristic emission; within the
certain range, the emission spectral line intensity is directly proportional to
the sodium atom concentration; through measuring the 330.2 nm emission
spectral line intensity, MEASURE the sodium content of the sample.
3.3.2 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.
3.3.2.1 Sodium standard solution. ρ (Na) = 1 mg/mL.
3.3.2.2 Dissolved acetylene.
3.3.3 Instruments
concentration range, the fluorescence intensity is directly proportional to the
selenium content of the sample solution.
4. 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.
4.2.1 Potassium hydroxide solution. ρ (KOH) = 5 g/L.
4.2.2 Potassium borohydride solution. ρ (KBH4) = 20 g/L. WEIGH 10.0 g of
potassium borohydride; DISSOLVE it into the 500 mL of potassium hydroxide
solution (4. 2.1); MIX it uniformly.
4.2.3 Potassium ferricyanide solution. ρ {K3[Fe(CN)6]} = 20 g/L.
4.2.4 Hydrochloric acid solution. φ (HCl) = 3 %.
4.2.5 Hydrochloric acid solution. φ (HCl) = 50 %.
4.2.6 Selenium standard solution. ρ (Se) = 1000 μg/mL.
4.2.7 Selenium standard solution. ρ (Se) = 10 μg/mL. Accurately PIPETTE
10.00 mL of selenium standard solution (4.2.6); USE hydrochloric acid
solution (4.2.4) to make its volume reach to 1000 mL; MIX it ...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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