HG/T 2520-2006 English PDF (HGT2520-2006)

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HG/T 2520-2006: Phosphorous acid for industrial use
HG/T 2520-2006
GB
ICS 71.060.30
G 11
Record Number. 18146-2006 HG
Chemical Industry Standard
of the People's Republic of China
Replacing HG/T 2520-1993
Phosphorous acid for industrial use
工业亚磷酸
ISSUED ON. JULY 26, 2005
IMPLEMENTED ON. MARCH 1, 2005
Issued by.
National Development and Reform Commission, The
People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Requirements ... 5 
4 Test methods ... 5 
5 Inspection rules ... 10 
6 Signs and labels ... 11 
7 Packaging, transportation and storage ... 11 
Foreword 
This standard is not equivalent to Japanese standard JISK 8063-1994 "Reagent
phosphorous acid" (Japanese version).
This standard replaces HG/T 2520-1993 "phosphorous acid".
The main technical differences between this standard and HG/T 2520-1993 are as
follows.
- ADD superior product index in requirements (3.2 in this standard).
This standard was proposed by China Petroleum and Chemical Industry Association.
This standard shall be centralized by the National Standardization Technical
Committee - Inorganic Chemistry Chemical Branch (SAC/TC63/SC1).
Main drafting organizations of this standard. Hangzhou Daming Chemical Co., Ltd.,
and Tianjin Chemical Research and Design Institute.
The main drafters of this standard. Wuqiu Ming, Weng Zhijian, and Wang Yan.
This standard replaces the previous standard.
- HG/T 2520-1993.
Phosphorous acid for industrial use
1 Scope   
This standard specifies the industrial phosphorous acid’s requirements, test methods,
inspection rules, signs, labels, packaging, transport, and storage.
This standard applies to phosphorous acid for industrial use. The product is mainly
used as production raw materials of phosphorous acid, synthetic fibres and
organophosphorus pesticides etc. It is also used in the production of high-efficient
water treatment agent - amino trimethylene phosphonic acid.
Molecular formula. H3PO3
Relative molecular mass. 81.99 (according to 2001 international relative atomic mass)
2 Normative References 
The following documents contain provisions which, through reference in this standard,
become provisions of this standard. For dated references, their subsequent
amendments (excluding corrections) or revisions do not apply to this standard.
However, the parties who enter into agreement based on this standard are
encouraged to investigate whether the latest versions of these documents are
applicable. For undated reference documents, the latest versions apply to this
standard.
GB/T 190-1990 Labels for Packages of Dangerous Goods
GB/T 191-2000 Packaging - Pictorial Marking for Handling of Goods (eqv ISO
780.1997)
GB/T 1250 Rules for expression and judgment of limiting values
GB/T 3049-1986 Chemical products for industrial use. General method for
determination of iron content. 1,10-Phenanthroline spectrophotometric
method (eqv ISO 6685.1982)
GB/T 6678 General principles for sampling chemical products
GB/T 6682-1992 Water for analytical laboratory use - Specification and test
methods (eqv ISO 3696.1987)
HG/T 3696.1 Inorganic chemicals for industrial use. Preparations of standard and
4.4.1 Method summary
In nitric acid medium, chloride ions in test solution and silver nitrate form insoluble
silver chloride. When chloride ion content is low, within a certain time, the silver
chloride is shown in suspension, so that the solution is cloudy. The turbidity of the test
solution is compared with the standard turbidity solution.
4.4.2 Reagents
4.4.2.1 Nitric acid solution. 1 + 3.
4.4.2.2 Silver nitrate solution. 17 g/L.
4.4.2.3 Chloride standard solution. 1 mL of the solution contains 0.010 mg of chlorine
(Cl).
PIPETTE 1.00 mL of chloride standard solution that is prepared according to HG/T
3696.2. PLACE in 100 mL volumetric flask. USE water to dilute to the mark. SHAKE
evenly.
4.4.3 Analysis steps
For superior product, WEIGH (3.00±0.01) g of sample; for first-class product and
qualified product, WEIGH (0.50±0.01) g of sample. PLACE in 50mL colorimetric tubes.
ADD 20mL of water to dissolve. Then ADD 2 mL of nitric acid solution and 2 mL of
silver nitrate solution. USE water to dilute to the mark. SHAKE evenly. PLACE for
10min. The turbidity must not be greater than the standard turbidity solution.
The standard is – for superior product, PIPETTE 3.00mL of chloride standard solution;
for first-class product, PIPETTE 5.00mL of chloride standard solution; for qualified
product, PIPETTE 10.00mL of chloride standard solution. PLACE in 50mL colorimetric
tubes. It is treated as same as the test sample at the same time.
4.5 Determination of iron content
4.5.1 Method summary
Same as Chapter 2 of GB/T 3049-1986.
4.5.2 Reagents
Chapter 3 of GB/T 3049-1986 and;
4.5.2.1 Ammonia.
4.5.2.2 Hydrochloric acid solution. 2 + 3.
4.5.3 Instruments
The turbidity of the test solution is compared with the standard turbidity solution.
4.6.2 Reagents
4.6.2.1 Ammonia solution. 2 + 3.
4.6.2.2 Hydrochloric acid solution. 1 + 4.
4.6.2.3 Magnesium mixed solution. WEIGH 5.5 g of magnesium chloride and 7 g of
ammonium chloride. PLACE in 200 mL beaker. ADD 65 mL of water to dissolve. Then
ADD 35 mL of ammonia solution. PLACE for 24 h. FILTER if necessary.
4.6.2.4 Phosphate standard solution. 1 mL of solution contains 0.1 mg of phosphate
(PO4).
PIPETTE 10.00 mL of phosphate standard solution that is prepared according to
HG/T 3696.2. PLACE in 100 mL volumetric flask. USE water to dilute to the mark.
SHAKE evenly.
4.6.3 Analysis steps
4.6.3.1 Preparation of test solution
WEIGH (1.00±0.01) g of sample. PLACE in 100 mL volumetric flask. USE water to
dilute to the mark. SHAKE evenly.
4.6.3.2 Determination
PIPETTE 10mL od solution. PLACE in 25 mL colorimetric tube. ADD 5 mL of aqueous
ammonia solution and 5mL of magnesium mixture solution. USE water to dilute to the
mark. SHAKE evenly. PLACE for 10min. The turbidity shall not be greater than the
standard turbidity solution.
The standard is – for superior product, PIPETTE 1.00mL of chloride standard solution;
for first-class product, PIPETTE 2.00mL of chloride standard solution; for qualified
product, PIPETTE 6.00mL of phosphate standard solution. PLACE in 25mL
colorimetric tubes. USE hydrochloric acid solution to adjust pH≈2. It is treated as
same as the test sample at the same time.
4.7 Determination of sulphate (counted in SO4) content
4.7.1 Method summary
In hydrochloric acid medium, sulphate in test solution and barium chloride form
insoluble barium sulphate and is shown in suspension, so that the solution is cloudy.
The turbidity of the test solution is compared with the standard turbidity solution.
4.7.2 Reagents
use shall comply with the requirements of the standard.
5.5 Use organization has the right to perform the acceptance inspection to the
phosphorous acid for industrial use in accordance with the requirements of this
standard. The acceptance shall be performed within 1 month from the date of arrival
of the goods.
5.6 If the test results in the indicators do not meet the requirements of this standard, it
shall be double-sampled from the packaging bags for re-inspection. In re-inspection
results, even if only one indicator does not meet the requirements of this standard, the
entire batch of product is deemed as unqualified.
5.7 ADOPT the rounding value comparison...