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| GB/T 31194-2014 | English | 155 |
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High purity zinc sulfide for industrial use
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GB/T 31194-2014: High purity zinc sulfide for industrial use---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/GBT31194-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
High purity zinc sulfide for industrial use
Issued on: SEPTEMBER 03, 2014
Implemented on: MAY 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Molecular formula and relative molecular mass... 5
4 Requirements... 5
5 Test methods... 5
6 Inspection rules... 13
7 Marking, labeling... 14
8 Packaging, transportation, storage... 14
High purity zinc sulfide for industrial use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking,
labeling, packaging, transportation, storage and safety of high purity zinc sulfide for
industrial use.
This Standard applies to high purity zinc sulfide for industrial use. This product is
mainly used as raw material for luminescent materials, anti-counterfeiting materials,
coating materials, window materials, electroluminescent powder, wear-resistant
materials, complexing agents, passivating agents, etc.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 191-2008, Packaging - Pictorial marking for handling of goods
GB/T 6678, General principles for sampling chemical products
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
GB/T 23771-2009, Determination of bulk density for inorganic chemical
products
HG/T 3696.1, Inorganic chemicals for industrial use - Preparations of standard
and reagent solutions for chemical analysis - Part 1.Preparations of standard
volumetric solutions
HG/T 3696.2, Inorganic chemicals for industrial use - Preparations of standard
and reagent solutions for chemical analysis - Part 2.Preparations of standard
solutions for impurity
HG/T 3696.3, Inorganic chemicals for industrial use - Preparations of standard
and reagent solutions for chemical analysis - Part 3.Preparations of reagent
solutions
3 Molecular formula and relative molecular mass
Molecular formula. ZnS.
Relative molecular mass. 97.45 (according to the international relative atomic mass in
2011);
4 Requirements
4.1 Appearance. White to off-white or yellow-green powder.
4.2 High purity zinc sulfide for industrial use shall be tested according to the test
methods specified in this standard and shall comply with the technical requirements in
Table 1.
5 Test methods
Warning. Some of the reagents used in this test method are corrosive, so be careful
when handling! If splashed on the skin, rinse with water immediately. In severe
cases, seek medical treatment immediately.
5.1 General provisions
The reagents and water used in this Standard, when no other requirements are specified,
refer to analytical reagents and grade-3 water specified in GB/T 6682-2008.The
standard titration solutions, impurity standard solutions, preparations and products that
are used in the test shall be prepared in accordance with the provisions of HG/T 3696.1,
HG/T 3696.2, HG/T 3696.3 when no other requirements are specified.
Take the arithmetic mean of the parallel determination results as the determination
result; the absolute difference between the two parallel determination results shall not
be larger than 0.2%.
5.4 Determination of iron, lead, copper, nickel, manganese and cadmium contents
5.4.1 Method summary
After dissolving the sample, measure the absorbance of each element on a graphite
furnace atomic absorption spectrophotometer, and calculate the content of each element
using the working curve method.
5.4.2 Reagents
5.4.2.1 Nitric acid solution. 2+98.
5.4.2.2 Nitric acid solution. 1+1, prepared using high-purity reagents.
5.4.2.3 Hydrochloric acid solution. 1+1, prepared using high-purity reagents.
5.4.2.4 Mixed standard solution of iron, lead, copper, nickel, manganese and cadmium.
1 mL of solution contains 0.01 mg/mL each of iron (Fe), lead (Pb), copper (Cu), nickel
(Ni), manganese (Mn) and cadmium (Cd). Pipette 1.00 mL of the standard solution of
iron (Fe), lead (Pb), copper (Cu), nickel (Ni), manganese (Mn) and cadmium (Cd)
prepared according to HG/T 3696.2 into the 100 mL volumetric flasks respectively; add
0.2 mL of nitric acid solution (see 5.4.2.2); use grade-1 water to dilute to the mark;
shake well. This solution shall be prepared before use.
5.4.2.5 Mixed standard solution of iron, lead, copper, nickel, manganese and cadmium.
1 mL of solution contains 0.1 μg/mL each of iron (Fe), lead (Pb), copper (Cu), nickel
(Ni), manganese (Mn) and cadmium (Cd). Pipette 1.00 mL of the standard solution of
iron (Fe), lead (Pb), copper (Cu), nickel (Ni), manganese (Mn) and cadmium (Cd)
prepared according to 5.4.2.4 into the 100 mL volumetric flasks; add 0.2 mL of nitric
acid solution (see 5.4.2.2); use grade-1 water to dilute to the mark; shake well. This
solution shall be prepared before use.
5.4.2.6 Grade-1 water, in accordance with the requirements of GB/T 6682-2008.
5.4.3 Instruments
Graphite furnace atomic absorption spectrophotometer. equipped with iron, lead,
copper, nickel, manganese, and cadmium hollow cathode lamps.
5.4.4 Analysis steps
5.4.4.1 Cleaning of instruments
Before cleaning, all instruments shall be decontaminated, rinsed with water, soaked in
nitric acid solution (see 5.4.2.1) for 24 hours, rinsed several times with grade-1 water,
and dried to prevent dust contamination.
5.4.4.2 Preparation of test solution
Weigh approximately 0.1 g ~ 2 g of sample A (see 5.6.2) according to the content of
impurity elements in the sample, accurate to 0.000 2 g; place it in a beaker; add 5 mL
of hydrochloric acid solution; cover with a watch glass; heat at low temperature until
almost dry; remove. Add water to dissolve the salts; cool and transfer all to a 50 mL (V)
volumetric flask; use grade-1 water to dilute to the mark; shake well.
At the same time, perform a blank test. Except for not adding the sample, the types and
amounts of other reagents added are exactly the same as those of the test solution and
are treated in the same way as the sample.
5.4.4.3 Drawing of the working curve
Take four 50 mL volumetric flasks; add 0.00 mL, 5.00 mL, 10.00 mL, and 15.00 mL of
the mixed standard solution (see 5.4.2.5), respectively; add 0.2 mL of nitric acid
solution (see 5.4.2.2); use grade-1 water to dilute to the mark; shake well. This standard
series solution I is used for the determination of lead and nickel content. The
concentrations of lead (Pb) and nickel (Ni) are 0 μg/L, 10 μg/L, 20 μg/L, and 30 μg/L,
respectively.
Take four 100 mL volumetric flasks; add 0.00 mL, 5.00 mL, 10.00 mL, and 15.00 mL
of the mixed standard solution (see 5.4.2.5), respectively; add 0.2 mL of nitric acid
solution (see 5.4.2.2); use grade-1 water to dilute to the mark; shake well. This standard
series solution II is used for the determination of iron and copper contents. The
concentrations of iron (Fe) and copper (Cu) are 0 μg/L, 5 μg/L, 10 μg/L, and 15 μg/L,
respectively.
Take four 100 mL volumetric flasks; add 0.00 mL, 2.50 mL, 5.00 mL, and 10.00 mL of
the mixed standard solution (see 5.4.2.5) respectively; add 0.2 mL of nitric acid solution
(see 5.4.2.2); use grade-1 water to dilute to the mark; shake well. This standard series
solution III is used for the determination of manganese content. The concentrations of
manganese (Mn) are 0 μg/L, 2.5 μg/L, 5 μg/L, and 10 μg/L, respectively.
Take four 100 mL volumetric flasks; add 0.00 mL, 0.50 mL, 1.00 mL, and 2.00 mL of
the mixed standard solution (see 5.4.2.5) respectively; add 0.2 mL of nitric acid solution
(see 5.4.2.2); use grade-1 water to dilute to the mark; shake well. This standard series
solution IV is used for the determination of cadmium content. The concentrations of
cadmium (Cd) are 0 μg/L, 0.5 μg/L, 1 μg/L, and 2 μg/L, respectively.
On a graphite furnace atomic absorption spectrophotometer, adjust the instrument to
the optimal state at the determination wavelength of each impurity element given in
Table 2; measure the absorbance of the element to be measured in each standard series
Take the arithmetic mean of the parallel determination results as the determination
result; the absolute difference between the two parallel determination results shall not
be larger than 0.02%.
5.7 Determination of bulk density
5.7.1 Method summary
A certain amount of sample passes through a conical funnel and falls freely into a
cylindrical material tank of known volume. Accurately weigh the mass of the sample
filling the material tank, and obtain the bulk density of the sample by calculation.
5.7.2 Instruments and apparatuses
Same as the requirements in Chapter 3 of GB/T 23771-2009.
5.7.3 Analysis steps
Same as the requirements in Chapter 4 of GB/T 23771-2009.
5.7.4 Result calculation
Same as the requirements in Chapter 5 of GB/T 23771-2009.
Take the arithmetic mean of the parallel determination results as the determination
result. The absolute difference between the two parallel determination results shall not
be greater than 0.02 g/mL.
5.8 Determination of particle size
5.8.1 Instrument
Laser particle size analyzer. equipped with ultrasonic dispersion device.
5.8.2 Analysis steps
Weigh 1.0 g of sample; place it in a 100 mL beaker; add about 40 mL of water. Disperse
in an ultrasonic disperser for 3 min ~ 5 min. Adjust the laser particle size analyzer to
the optimal operating state of the instrument; measure the particle size (D50) of the
sample according to the measurement steps specified by the laser particle size analyzer.
6 Inspection rules
6.1 All indicators and items specified in this standard are ex-factory inspection items
and shall be inspected batch by batch.
6.2 High purity zinc sulfide for industrial use of the same grade produced continuously
or by the same team using the same materials and under essentially the same production
conditions is considered a batch. Each batch of products shall not exceed 1 t.
6.3 Determine the number of sampling units in accordance with the provisions of GB/T
6678.When sampling, insert the sampler obliquely from the top of the packaging bag
to 3/4 of the depth of the material layer to take samples. Mix the sample thoroughly;
divide it into quarters to not less than 500 g; immediately divide the sample into two
clean, dry containers; seal them; affix labels indicating. manufacturer name, product
name, grade, batch number, sampling date and name of the sampler. One is used for
inspection and the other is kept for reference. The storage period is determined by the
manufacturer based on actual conditions.
6.4 If any indicator in the test results does not meet the requirements of this Standard,
samples shall be taken from twice the amount of packaging for re-testing. If even one
indicator in the re-test results does not meet the requirements of this standard, the entire
batch of products shall be deemed unqualified.
6.5 Use the rounded value comparison method specified in GB/T 8170 to determine
whether the test results comply with the standard.
7 Marking, labeling
7.1 The packaging of high purity zinc sulfide for industrial use shall be clearly and
firmly labeled with the following information. manufacturer name, address, product
name, grade, net content, batch number (or production date), shelf life, and number of
this standard, as well as the graphics of "keep away from heat" and "keep away from
moisture" specified in GB/T 191-2008.
7.2 Each batch of high purity zinc sulfide for industrial use shipped out of the factory
shall be accompanied by a quality certificate. The contents shall include. manufacturer
name, factory address, product name, grade, net content, batch number (or production
date), certification that product quality complies with this Standard and number of this
Standard.
8 Packaging, transportation, storage
8.1 High purity zinc sulfide for industrial use shall be packaged in double layers. The
inner packaging shall be a double-layer polyethylene plastic film bag. After the air is
exhausted during the inner bag packaging, the bag opening shall be tied tightly with
vinyl rope, or sealed with an equivalent method. It shall be leak-proof. The outer
packaging shall be a composite plastic woven bag or packaging barrel. The outer
packaging bag shall be firmly sewn without leaks or jumpers. The packaging barrel
shall be completely sealed. The net content of each bag (barrel) shall be 20 kg.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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