GB 10500-2009 English PDF (GB10500-2009)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB 10500-2009
Historical versions: GB 10500-2009
Preview True-PDF (Reload/Scroll if blank)

GB 10500-2009: [GB/T 10500-2009] Sodium sulfide for industrial use
GB/T 10500-2009 (GB 10500-2009)
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
GB/T 10500-2009
Replacing GB/T 10500-2000
Sodium Sulfide for Industrial Use
工业硫化钠
ISSUED ON: JUNE 2, 2009
IMPLEMENTED ON: FEBRUARY 1, 2010
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 Molecular Formula and Relative Molecular Mass ... 5
4 Classification and Appearance ... 5
5 Requirements ... 5
6 Testing Method ... 5
7 Testing Rules ... 16
8 Marking and Labeling ... 17
9 Packing, Transporting and Storage ... 17
Sodium Sulfide for Industrial Use
1 Scope
This standard specifies the requirements, testing method, inspection rules, marking, labeling,
packing, transporting and storage of sodium sulfide for industrial use.
This standard is applicable to lump, flaky and grainy sodium sulfide for industrial use, which
is used in fields like paper making, dyestuff, mineral processing and printing.
2 Normative References
Provisions of the following documents, through reference in this standard, constitute
provisions of this standard. For dated reference, subsequent amendments to (excluding
correction to), or revisions of, any of these publications do not apply. However, the parties
whose enter into agreement according to these specifications are encouraged to research
whether the latest editions of these labels are applied or not. For undated references, the latest
editions of the normative documents are applicable to this standard.
GB 190-1990 Labels for packages of dangerous goods
GB/T 191-2008 Packaging - Pictorial marking for handling of goods (ISO 780:1997,
MOD)
GB/T 3049-2006 Chemical products for industrial use - General method for determination
of iron content – 1,10-Phenanthroline spectrophotometric method (ISO 6685:1982, IDT)
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO
3696:1987, MOD)
GB/T 8170-2008 Rules of rounding off for numerical values and expression and judgement
of limiting values
HG/T 3696.1 Inorganic chemical products Preparations of standard volumetric solutions
for chemical analysis
HG/T 3696.2 Inorganic chemical products Preparations of standard solutions for chemical
analysis
HG/T 3696.3 Inorganic chemical products Preparations of reagent solutions for chemical
analysis
reference solution, preparation and product used in the tests shall be prepared according to the
requirements of HG/T 3696.1, HG/T 3696.2, and HG/T 3696.3.
6.3 Preparation of test solution
6.3.1 Test solution A: with a weighing bottle of a given mass, weigh 30g full-dissolve test
sample solution (7.3.1), accurate to 0.01 g; transfer it into a 1000mL volumetric flask; dilute it
to the scale with water free of carbon dioxide, and shake up. This solution is test solution A.
The mass (m) of sodium sulfide solid sample is calculated according to formula (1):
Where,
m1 -- mass value of full-dissolve test sample solution prepared (g);
m2 -- mass of dissolve sodium sulfide (g);
m3 -- mass value of the full-dissolve test sample solution weighed by the weighing bottle (g).
6.3.2 Test solution B: weigh about 10g of solid sample, accurate to 0.01 g, place it in a
beaker, add with 100mL of water, and heat to dissolving; transfer the solution to a 1000mL
volumetric flask; dilute it to the scale with water free of carbon dioxide, and shake up. This
solution is test solution B.
Test solution A or B are used for the determination of the contents of sodium sulfide, sodium
sulfite, sodium thiosulfate, iron, and sodium carbonate.
6.4 Determination for sodium sulfide content
6.4.1 Method summary
Add superfluous iodine reference solution in a weak acid solution, back-titrate the solution
with sodium thiosulfate titrant, and test the total reduction; subtract with the equivalent
amount of content of sodium thiosulfate and sodium sulfite, tested by the iodometry. The
difference hereof is the sodium sulfide content.
6.4.2 Reagent
6.4.2.1 Acetic acid solution: 1+10;
6.4.2.2 Iodine standard titrant: 

22
1 Ic ≈ 0.1 mol/L;
6.4.2.3 Sodium thiosulfate standard titrant: c( Na2S2O3) ≈ 0.1 mol/L;
6.4.2.4 Starch indicating solution: 5g/L.
6.4.3 Analysis procedure
Take 20mL of iodine standard titrant with a transfer pipet, and transfer to a 250mL iodine
measuring flask, add 25mL of water and 10mL of acetic acid solution; while shaking up, add
10mL of test solution A or B with a transfer pipet; titrate with sodium thiosulfate standard
titrant to the solution becoming yellow; add 2mL of starch indicating solution; and continue to
titrate till the blue color disappears.
6.4.4 Result calculation
The sodium sulfide content, expressed by the sodium sulfide (Na2S) mass fraction w1 in "%",
is calculated according to formula (2):
Where,
V1 -- volume value of iodine standard titrant added, (mL);
V2 -- volume value of sodium thiosulfate standard titrant consumed in titrating, (mL);
V3 -- volume value of iodine standard titrant consumed in titrating 6.4.3, (mL);
c1 -- accurate concentration value of iodine standard titrant (mol/L);
c2 -- accurate concentration value of sodium thiosulfate standard titrant (mol/L);
m -- mass value of solid sample, (g);
M -- mole mass of sodium sulfide( 2
1 Na2S), (g/mol) (M＝39.02).
The arithmetic mean value of the parallel determination results is adopted as the final
determination result, and the absolute difference hereof shall not be larger than 0.3%.
6.5 Determination of sodium sulfite content
6.5.1 Method summary
Add zinc carbonate suspension in the test solution, and precipitate sulfur ions; take a portion
of filtered liquor, and determinate the sodium thiosulfate and sodium sulfite contents of
sodium thiosulfate and sodium sulfite by iodometry; subtract the amount equivalent to the
sodium thiosulfate content. The difference between these two is the sodium sulfite content.
6.6 Determination of sodium thiosulfate content
6.6.1 Method summary
Add zinc carbonate suspension in a test solution, precipitate sulfur ions, add formaldehyde
solution to shield sodium sulfite, and titrate sodium thiosulfate with iodine standard titrant.
6.6.2 Reagent
6.6.2.1 Formaldehyde;
6.6.2.2 Sodium carbonate solution 100g/L;
6.6.2.3 Zinc sulphate (ZnSO4 ꞏ 7H2O) solution: 100g/L;
6.6.2.4 Acetic acid solution: 1+10;
6.6.2.5 Iodine standard titrant: the concentration is one specified in 6.4.2.2;
6.6.2.6 Starch indicating solution: 5g/L.
6.6.3 Analysis procedure
Take 100mL of filtered liquor (6.5.3) after filtration with a transfer pipet, and transfer it in a
500mL conical beaker; add 5mL of formaldehyde solution, 10mL of acetic acid solution and
2mL of starch indicating solution, and titrate with iodine standard titrant till the solution color
becomes blue.
6.6.4 Result calculation
The sodium thiosulfate content, expressed by sodium thiosulfate (Na2S2O3) mass fraction w3
in "%", is calculated according to formula (4):
Where,
V4 -- volume value of iodine reference solution consumed in titrating, (mL);
C -- accurate concentration value of iodine standard titrant (mol/L);
m -- mass value of solid sample, (g);
M -- mole mass value of sodium sulphate (Na2S2O3) (g/mol) (M=158.1).
The arithmetic mean value of the parallel determination res...