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GB/T 1396-2015 PDF in English


GB/T 1396-2015 (GB/T1396-2015, GBT 1396-2015, GBT1396-2015)
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GB/T 1396-2015: PDF in English (GBT 1396-2015)

GB/T 1396-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.30
G 62
Replacing GB/T 1396-1993
Chemical reagent - Ammonium sulfate
(ISO 6353-3:1987, Reagents for chemical analysis - Part 3: Specifications -
Second series, NEQ)
ISSUED ON: JULY 03, 2015
IMPLEMENTED ON: FEBRUARY 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Properties... 5 
4 Specifications ... 5 
5 Test ... 6 
6 Inspection rules ... 9 
7 Packaging, storage, transportation, marking ... 9 
Chemical reagent - Ammonium sulfate
1 Scope
This standard specifies the properties, specifications, tests, inspection rules,
packaging, storage, transportation, marking of the chemical reagent -
ammonium sulfate.
This standard applies to the inspection of the chemical reagent - ammonium
sulfate.
Molecular formula: (NH4)2SO4
Relative molecular mass: 132.12 (according to the 2011 international relative
atomic mass)
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 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602 Chemical reagent – Preparations of standard solutions for impurity
GB/T 603 Chemical reagent – Preparations of reagent solution for use in test
methods
GB/T 610-2008 Chemical reagent - General method for the determination
of arsenic
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 9723-2007 Chemical reagent - General rule for flame atomic
absorption spectrometry analysis
GB/T 9724 Chemical reagent - General rule for the determination of pH
GB/T 9727 Chemical reagent - General method for the determination of
phosphate
5 Test
Warning - Some reagents used in this test method are toxic or corrosive.
Some test procedures may lead to dangerous situations. The operator
shall take appropriate safety and health measures.
5.1 General provisions
Unless otherwise specified in this chapter, the standard titration solutions,
standard solutions, preparations and products, which are used in this chapter,
are all prepared in accordance with the provisions of GB/T 601, GB/T 602, GB/T
603. The experimental water shall meet the requirements of grade III water in
GB/T 6682. Samples are weighed to the nearest 0.01 g. For the solutions, which
are expressed by "%", it means mass fraction.
5.2 Contents
5.2.1 Preparation of neutral formaldehyde solution
Measure 20 mL of formaldehyde solution. Add 20 mL of water. Add 2 drops of
phenolphthalein indicator solution (10 g/L). Use sodium hydroxide standard
titration solution [c (NaOH) = 1 mol/L] to titrate the solution, until it becomes
pink. Prepare it before use.
5.2.2 Determination method
Weigh 2 g of sample, accurate to 0.0001 g. Dissolve it in 40 mL of water. Add
40 mL of neutral formaldehyde solution. Shake well. Place for 30 min. Use
sodium hydroxide standard titration solution [c (NaOH) = 1 mol/L] to titrate it,
until the solution is pink. Heat slightly to 50 °C. Continue titration, until the
solution is pink. Keep it for 5 min.
The mass fraction w of ammonium sulfate is calculated according to formula
(1):
Where:
V - the volume of sodium hydroxide standard titration solution, in milliliters
(mL);
c - The concentration of sodium hydroxide standard titration solution, in
moles per liter (mol/L);
M - The molar mass of ammonium sulfate, in grams per mole (g/mol) {M
the sample at the same time.
Analytically pure: 0.01 mg; chemically pure: 0.05 mg.
5.9 Phosphate
Weigh 1 g of the sample. Dissolve it in 5 mL of water. Add 2 drops of saturated
2,4-dinitrophenol indicator solution. Add nitric acid solution (13%) dropwise,
until the yellow color just disappears. After diluting to 10 mL, follow the
requirements of GB/T 9727 to make determination. The blue of the organic
phase shall not be deeper than the standard colorimetric solution.
For the preparation of the standard colorimetric solution: take the phosphate
(PO4) standard solution, which contains the following amount; process it the
same as the sample at the same time.
Analytically pure: 0.005 mg; chemically pure: 0.020 mg.
5.10 Arsenic
Weigh 5 g of the sample. Dissolve it in 30 mL of water. Determine it in
accordance with 4.2 in GB/T 610-2008. The purple-red color of the absorption
solution shall not be deeper than the standard colorimetric solution.
For the preparation of the standard colorimetric solution: take the arsenic (As)
standard solution, which contains the following amount; process it the same as
the sample at the same time.
Analytically pure: 0.001 mg; chemically pure: 0.010 mg.
5.11 Calcium
5.11.1 Reagents, materials and instruments
According to the provisions of Chapter 5 and Chapter 6 of GB/T 9723-2007.
5.11.2 Instrument conditions
Light source: Calcium hollow cathode lamp.
Wavelength: 422.7 nm.
Flame: Acetylene-air.
5.11.3 Determination method
Add 2 mL of hydrochloric acid solution (10%), in the residue after measuring
the ignition residue (5.6), to dissolve it. Dilute it to 100 mL. Take 20 mL. Dilute
it to 100 mL. Determine it according to 7.2.1 in GB/T 9723-2007. The result is
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.