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GB 1903.9-2015

GB 1903.9-2015_English: PDF (GB1903.9-2015)
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GB 1903.9-2015English70 Add to Cart 0--10 minutes. Auto-delivered. National Food Safety Standard -- Food Nutrition Enhancer -- Sodium Selenite GB 1903.9-2015 Valid GB 1903.9-2015
 

BASIC DATA
Standard ID GB 1903.9-2015 (GB1903.9-2015)
Description (Translated English) National Food Safety Standard -- Food Nutrition Enhancer -- Sodium Selenite
Sector / Industry National Standard
Classification of Chinese Standard X40
Classification of International Standard 67.220.20
Word Count Estimation 10,162
Date of Issue 2015-11-13
Date of Implementation 2016-05-13
Administrative Organization National Health and Family Planning Commission of the People Republic of China
Regulation (derived from) National Health and Family Planning Commission Announcement No
Issuing agency(ies) National Health and Family Planning Commission of the People's Republic of China
Summary This standard applies to selenium acid, sodium hydroxide as raw materials, food nutrition fortifier sodium selenite.

GB 1903.9-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard -
Food nutrition enhancer - Sodium selenite
食品营养强化剂 亚硒酸钠
ISSUED ON. NOVEMBER 13, 2015
IMPLEMENTED ON. MAY 13, 2016
Issued by. National Health and Family Planning Commission of the PRC
Table of Contents
1 Scope .. 3 
2 Chemical formula, structural formula and relative molecular mass . 3 
3 Technical requirements . 3 
Appendix A Testing method . 5 
National food safety standard -
Food nutrition enhancer - Sodium selenite
1 Scope
This standard applies to the food nutrition enhancer sodium selenite which is
manufactured using the raw materials of selenous acid and sodium hydroxide.
2 Chemical formula, structural formula and relative
molecular mass
2.1 Chemical formula
Na2SeO3
2.2 Structure
2.3 Relative molecular sass
172.94 (in accordance with international relative atomic mass in 2011)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall meet the requirements of Table 1.
Table 1 -- Sensory requirements
Item Requirements Inspection methods
Color, texture White or slightly red crystalline or crystalline powder
Take an appropriate amount of
specimen, place it in a clean, dry
white porcelain dish, observe its
color and texture in natural light
Solution clarity
and color
The solution shall be clear and colorless; if
turbid, it shall be ≤ 2 turbidity standard A.4 in Appendix A
A.3.2.2 Selenite ion identification (select one method)
A.3.2.2.1 TAKE about 0.1 g of specimen, DISSOLVE it in 5 mL of water, ADD 1
mL of ammonium thiocyanate solution, then ADD a few drops of concentrated
hydrochloric acid to make it acidic, that is, it produces red turbidity.
A.3.2.2.2 TAKE about 0.1 g of specimen, DISSOLVE it in 5 mL of water, ADD 1
mL of copper sulfate solution, which produces a blue-green precipitate, the
precipitate is dissolved in acetic acid solution.
A.3.2.2.3 TAKE about 0.05 g of specimen, ADD 5 mL of hydrochloric acid
solution, SHAKE to dissolve it, ADD 2 mL of sodium thiosulfate solution, HEAT
it, the solution is in orange red.
A.4 Determination of solution clarity and color
A.4.1 Determination of solution color
A.4.1.1 Reagents and materials
A.4.1.1.1 Hydrochloric acid solution. 1 + 40.
A.4.1.1.2 Sodium thiosulfate standard titration solution. c (Na2S2O3) = 0.1 mol/L.
A.4.1.1.3 Starch indicator solution. WEIGH 0.5 g of soluble starch, ADD 5 mL
of water, SHAKE it uniformly, slowly POUR it into 100 mL of boiling water, STIR
it, CONTINUE boiling for 2 min, COOL it down, TAKE the supernatant,
PREPARE it before use.
A.4.1.1.4 Ammonia test solution. MEASURE 400 mL of concentrated ammonia,
ADD water to dilute it to 1000 mL.
A.4.1.1.5 Acetic acid - sodium acetate buffer (pH6.0). WEIGH 54.6 g of sodium
acetate, ADD 20 mL of 1 mol/L acetic acid solution to dissolve it, ADD water to
dilute it to 500 mL.
A.4.1.1.6 Xylenol orange indicator solution. WEIGH 0.2 g of xylenol orange,
DISSOLVE it in 100 mL of water.
A.4.1.1.7 Disodium ethylenediaminetetraacetic acid titrant. c(Na2EDTA) = 0.05
mol/L.
A.4.1.2 Analytical procedures
A.4.1.2.1 Preparation of standard stock solutions of various colors
A.4.1.2.1.1 Potassium dichromate solution. Accurately WEIGH 400 mg of
potassium dichromate which has been dried to constant weight at 120 °C, USE
water to dilute it to 500 mL (1 mL of solution contains 0.800 mg of K2Cr2O7).
Water / mL 97.50 95.0 90.0 70.0 50.0
A.4.2.2.4 Determination
WEIGH 1.0 g of specimen, PLACE it in a 10 mL Nessler colorimetric tube, USE
10 mL of newly boiled cold water to dissolve it, the solution shall be clear. If
there is turbidity, if it is compared with the orange red No.2 turbidity standard
solution of the same volume, it shall not be deeper.
A.5 Determination of sodium selenite content (dry basis)
A.5.1 Reagents and materials
A.5.1.1 Potassium iodide solution. WEIGH 16.5 g of potassium iodide, ADD
water to 100 mL, PREPARE it before use.
A.5.1.2 Starch indicator solution. WEIGH 0.5 g of soluble starch, ADD 5 mL of
water, SHAKE it uniformly, slowly POUR in 100 mL of boiling water, whilst STIR
it, CONTINUE boiling for 2 min, COOL it down, ABSORB the supernatant,
PREPARE it before use.
A.5.1.3 Hydrochloric acid solution. PIPETTE 234 mL of concentrated
hydrochloric acid, USE water to make the volume reach to 1000 mL.
A.5.1.4 Sodium thiosulfate standard titration solution. c (Na2S2O3) = 0.01 mol/L.
A.5.2 Analytical procedures
WEIGH 2.0 g of specimen which has been dried to constant weight, accurate
to 0.0001 g, PLACE it in a 100 mL volumetric flask, ADD water and SHAKE to
dissolve it, DILUTE it to the mark, SHAKE it uniformly, FILTER it, PIPETTE 1
mL of filtrate into a 100 mL volumetric flask, ADD water to dilute it to the mark.
PIPETTE 50 mL of this solution into the iodine volumetric flask, ADD 3 mL
hydrochloric acid solution and 5 mL of potassium iodide solution, then ADD 2
mL of starch indicator solution, USE sodium thiosulfate standard titration
solution to titrate it until the blue disappears. At the same time MAKE a blank
test.
A.5.3 Result calculation
Sodium selenite content (dry basis) w1, calculated in accordance with formula
(A.1).
Where.
A.9.1.1 Potassium sulfate standard solution. WEIGH 0.181 g of potassium
sulfate, USE water to make its volume to 1000 mL (equivalent to 100 μg/mL
SO4).
A.9.1.2 Hydrochloric acid solution. PIPETTE 234 mL of hydrochloric acid, USE
water to make its volume to 1000 mL.
A.9.1.3 Cesium chloride solution (25%). WEIGH 25 g of cesium chloride, USE
water to make its volume to 1000 mL.
A.9.2 Analytical procedures
WEIGH 0.5 g of specimen, PLACE it in a 50 mL Nessler colorimetric tube, USE
40 mL of water to dissolve it (if the solution is alkaline, it may drop nitric acid
solution to make the pH neutral), ADD another 2 mL of hydrochloric acid
solution, SHAKE it uniformly. ADD 5 mL of cesium chloride solution, USE water
to dilute it to 50 mL, slowly SHAKE it uniformly, LET it be standing for 10 min.
TAKE 10 mL of potassium sulfate standard solution, which is treated same as
the test solution.
On the same black background, LOOK down from the top of the colorimetric
tube to compare the resulting turbidity. The turbidity of the specimen solution
must not be deeper than the control solution.
A.10 Determination of water insoluble
A.10.1 Instruments and equipment
A.10.1.1 No.4 glass sand core crucible. The pore size of the filter plate is 5 μm
~ 15 μm.
A.10.1.2 Electric thermostatic oven. The temperature can be controlled at
105 °C ± 2 °C.
A.10.2 Analytical procedures
WEIGH 5.0 g of specimen, accurate to 0.0001 g, PLACE it in a 250 mL beaker,
ADD 100 mL of boiling water to dissolve it, COVER the watch glass,
MAINTAINE the temperature in boiling water bath for 1 h, TAKE it out, COOL it
to room temperature, USE the glass sand core crucible which has been dried
to the constant mass at 105 °C ± 2 °C to filter it, USE hot water to wash it to
neutral, PLACE it into an electric constant temperature drying oven, DRY it to
constant mass at a temperature of 105 °C ± 2 °C.
A.10.3 Result calculation
The water insoluble matter content w3 is calculated in accordance with formula