GB/T 534-2014 English PDF (GBT534-2014)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 534-2014
Historical versions: GB/T 534-2014
Preview True-PDF (Reload/Scroll if blank)

GB/T 534-2014: Sulphuric acid for industrial use
GB/T 534-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.30
G 11
Replacing GB/T 534-2002
Sulphuric acid for industrial use
工业硫酸
ISSUED ON: JULY 08, 2014
IMPLEMENTED ON: DECEMBER 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Product classification ... 5
4 Requirements ... 6
5 Test methods ... 7
5.1 General ... 7
5.2 Determination of mass fraction of sulphuric acid in concentrated sulphuric acid ... 7
5.3 Determination of free sulfur trioxide mass fraction in oleum ... 8
5.4 Determination of ash mass fraction ... 9
5.5 Determination of iron mass fraction ... 10
5.6 Determination of mass fraction of arsenic ... 14
5.7 Determination of mass fraction of lead ... 19
5.8 Determination of mass fraction of mercury ... 21
5.9 Determination of transparency ... 27
5.10 Determination of chromaticity ... 29
6 Inspection rules ... 29
7 Marks, transport and storage ... 30
8 Safety ... 31
Annex A (informative) Purification of dithizone reagent ... 32
Sulphuric acid for industrial use
WARNING: Some reagents used in this Standard are toxic or corrosive. Some
operations are dangerous. This Standard does not reveal all possible safety issues.
Users shall use it correctly in strict accordance with relevant regulations and are
responsible for taking appropriate safety and health measures.
1 Scope
This Standard specifies the classification, requirements, test methods, inspection rules
and marks, transportation, storage and safety of sulphuric acid for industrial use.
This Standard applies to sulphuric acid for industrial use produced from pyrite, sulfur,
smelting flue gas or other sulfur-containing raw materials.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB 190-2009, Packing symbol of dangerous goods
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 solutions for use in test
methods
GB/T 610, Chemical reagent - General method for the determination of arsenic
GB/T 6680, General rules for sampling liquid 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 and expression and
judgement of limiting values
3 Product classification
Sulphuric acid for industrial use is divided into concentrated sulphuric acid and fuming
Keep away from light.
5.5.1.2.6 Iron (Fe) standard solution: 0.1mg/mL.
5.5.1.2.7 Iron (Fe) standard solution: 10μg/mL.
Measure 10.00mL of iron standard solution (5.5.1.2.6) into a 100mL volumetric flask.
Use water to dilute to the scale. Shake well. Prepare this solution when it is required.
5.5.1.3 Instruments
Spectrophotometer: with 1cm cuvette.
5.5.1.4 Analysis steps
5.5.1.4.1 Drawing of working curve
Take five 50mL volumetric flasks. Add 0mL, 2.50mL, 5.00mL, 7.50mL, 10.00mL of
iron standard solution (5.5.1.2.7) respectively. Do the following for the solution in each
volumetric flask: Add water to about 25mL. Add 2.5mL of hydroxylamine
hydrochloride solution (5.5.1.2.3) and 5mL of acetic acid-sodium acetate buffer
solution (5.5.1.2.4). After 5min, add 5mL of o-phenanthroline hydrochloric acid
solution (5.5.1.2.5). Use water to dilute to the scale. Shake well. Leave it for
15min~30min to develop color.
At the wavelength of 510nm, use a 1cm cuvette. Use the blank solution without iron
standard solution as a reference. Use a spectrophotometer to determine the absorbance
of the above solution.
Take the mass of iron in the above solution (in micrograms) as the abscissa, and the
corresponding absorbance value as the ordinate, to draw the working curve. Or calculate
a linear regression equation based on the obtained absorbance value.
5.5.1.4.2 Determination
Weigh 10g~20g of specimen, accurate to 0.01g. Put in a 50mL beaker. Evaporate to
dryness on a sand bath (or temperature-controlled hotplate). Cool. Add 2mL of
hydrochloric acid solution (5.5.1.2.2) and 25mL of water. Heat to dissolve the salt.
Transfer to a 100mL volumetric flask. Use water to dilute to the scale. Shake well.
Use a pipette to measure a certain volume of the test solution. Place it in a 50mL
volumetric flask. Make the corresponding iron mass between 10μg~100μg. Add water
to dilute to about 25mL. Then follow the steps in "Add 2.5mL of hydroxylamine
hydrochloride solution (5.5.1.2.3) … develop color" in 5.5.1.4.1.
At a wavelength of 510nm, use a 1cm cuvette. Use the blank solution without iron
standard solution as a reference. Use a spectrophotometer to determine the absorbance
of the test solution.
Measure 10.00mL of iron standard solution (5.5.2.3.2) into a 100mL volumetric flask.
Use water to dilute to the scale. Shake well. Prepare this solution when it is required.
5.5.2.4 Instruments
5.5.2.4.1 Dropping bottle: the capacity is about 30mL.
5.5.2.4.2 Atomic absorption spectrophotometer (with iron hollow cathode lamp).
5.5.2.5 Analysis steps
5.5.2.5.1 Drawing of working curve
Take five 50mL volumetric flasks. Add 0mL, 1.00mL, 2.00mL, 3.00mL, 4.00mL of iron
standard solution (5.5.2.3.3) respectively. Add 25mL of nitric acid solution (5.5.2.3.1)
to each. Use water to dilute to the scale. Shake well.
On an atomic absorption spectrophotometer, according to the working conditions of the
instrument, with air-acetylene flame, carry out zero adjustment with blank solution
without adding iron standard solution. Determine the absorbance of the solution at a
wavelength of 248.3nm.
Take the mass of iron in the above solution (in micrograms) as the abscissa, and the
corresponding absorbance value as the ordinate, to draw the working curve. Or calculate
a linear regression equation based on the obtained absorbance value.
5.5.2.5.2 Determination
Use a dropping bottle filled with specimen. Weigh 4g~10g of specimen by subtraction
method, accurate to 0.01g. Put in a 50mL beaker. Evaporate slowly to dryness on a sand
bath (or an adjustable temperature electric stove). Cool. Add 25mL of nitric acid
solution (5.5.2.3.1). Heat to dissolve the residue. Then evaporate to dryness. Cool. Add
25mL of nitric acid solution to dissolve the residue. Transfer to a 50mL volumetric flask.
Use water to dilute to the scale. Shake well.
On the atomic absorption spectrophotometer, according to the working conditions of
the instrument, with air-acetylene flame, carry out zero adjustment with blank solution
without adding iron standard solution. Measure the absorbance of the solution at a
wavelength of 248.3nm. According to the absorbance value of the test solution, find out
from the working curve or calculate the mass of iron in the teste solution according to
the linear regression equation.
5.5.2.6 Calculation of results
The mass fraction w5 of iron (Fe) is calculated according to formula (5):
Weigh 0.5g of potassium hydroxide. Place it in a 150mL beaker. Add about 50mL of
wate...