GB 5009.74-2014 PDF English
US$70.00 · In stock · Download in 9 secondsGB 5009.74-2014: National Food Safety Standard -- Method for Limit Test of Heavy Metals in Food Additives Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 5009.74: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.74-2014 | English | 70 |
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National Food Safety Standard -- Method for Limit Test of Heavy Metals in Food Additives
| Valid |
| GB/T 5009.74-2003 | English | 190 |
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Method for limit test of heavy metals in food additives
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 5009.74-2014
GB 5009.74-2014: National Food Safety Standard -- Method for Limit Test of Heavy Metals in Food Additives
---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/GB5009.74-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Method for Limit Test of Heavy Metals in Food Additives
Issued on. SEPTEMBER 21, 2015
Implemented on. MARCH 21, 2016
Issued by. National Health and Family Planning Commission of the
People’s Republic of China
Table of Contents
Foreword... 3
1 Application Scope... 4
2 Principle... 4
3 Reagents and Materials... 4
4 Apparatus... 5
5 Specimen Treatment... 6
6 Determination... 7
Foreword
This Standard replaces GB/T 5009.74-2003, Method for Limit Test of Heavy Metals in
Food Additives.
Compared with GB/T 5009.74-2003, the major changes of this Standard are as follows.
-- the standard name is changed into “National Food Safety Standard – Method for
Limit Test of Heavy Metals in Food Additives”;
-- the pressure digestion tank digestion method is added.
National Food Safety Standard -
Method for Limit Test of Heavy Metals in Food Additives
1 Application Scope
This Standard specifies the method for limit test of heavy metals in food additives.
This Standard applies to the limit test of heavy metals in food additives.
2 Principle
Under the weak acid (pH 3~4) conditions, the heavy metal ions in the specimen react
with hydrogen sulphide to generate a brownish black colour; then it is compared with
the lead standard solution which is processed using the same method.
3 Reagents and Materials
NOTE Unless stated otherwise, in this Standard, the reagents used are analytically
pure and the water is grade 1 water as specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.6 Phenolphthalein (C2OH14O4).
3.1.7 Hydrogen peroxide (H2O2).
3.2 Preparation of reagents
3.3 Standard substance
High-purity lead nitrate [Pb(NO3)2], a standard substance whose purity is 99.99% or
which passes the national certification and is granted of the certificate of standard
substance.
3.4 Preparation of standard solutions
3.4.1 Lead standard stock solution (1 mg/mL). weigh 0.159 8 g of high-purity lead
nitrate [Pb(NO3)2] to dissolve in 10 mL of nitric acid solution (1%),
3.4.2 Lead standard working solution (10 μg/mL). absorb 1.0 mL of lead standard
stock solution (1 mg/mL) to pour into a 100 mL volumetric flask, add water to the scale.
4 Apparatus
NOTE All glass apparatus used needs to be soaked in nitric acid (1 + 4) for more
than 24 h, rinsed with water repeatedly and finally rinsed clean with deionized water.
4.1 50 mL Nessler tubes.
4.5 Electronic balances. sensitivities 0.1 mg and 1 mg.
4.6 Water baths.
4.7 Pressure digestion tanks.
5 Specimen Treatment
5.1 Preparation of inorganic specimens
The “specimen treatment” of inorganic specimens may be the pretreatment as required
by the specifications of all products including dissolution or digestion.
5.2 Preparation of organic specimens
The “specimen treatment” of organic specimens may generally be conducted in
accordance with the following methods, in addition to the specification requirements of
all products.
a) wet digestion. weigh 5.00 g of specimen, place in a 25 mL conical flask, add 10
mL ~ 15 mL of nitric acid to moisten the specimen, heat on an electric hot plate
after placing aside for a moment (or overnight), take down for cooling after the
reaction becomes gentle, add 5 mL of sulphuric acid along the flask wall,
continue to heat until the solution in the flask becomes brown, add nitric acid
continuously (add some perchloric acid if necessary) until the organic materials
are fully decomposed, continue to heat until lots of sulfur dioxide white smoke is
generated and finally the solution shall be colourless or yellowish.
b) dry digestion. weigh 5.00 g of specimen, place in a hard glass evaporating dish
or quartz crucible, add an appropriate quantity of sulphuric acid to moisten the
specimen, use a soft fire on an electric furnace for carbonization before adding
2 mL of nitric acid and 5 drops of sulphuric acid, heat carefully until white smoke
disperses completely, transfer to a muffle furnace, conduct full ashing at 500°C,
take out after cooling, add 2 mL of hydrochloric acid (6 mol/L) to moisten the
residual and evaporate on a water bath until dry. Use 1 drop of concentrated
hydrochloric acid to moisten the residual, add 10 mL of water, heat once again
on a boiling water bath for 2 min, transfer the solution to a 20 mL volumetric flask,
conduct filtration if necessary, use a small quantity of water to wash the crucible
and filter, transfer the filtrate together into a volumetric flask, mix up after adding
dropwise to the scale.
c) pressure digestion tank digestion method. weigh an appropriate quantity of
specimen (accurate to 0.001 g) in accordance with the operating instructions to
the pressure digestion tank to place into the inner tank of TTeflon, and add 2 mL
~ 4 mL of nitric acid to soak overnight.
6 Determination
6.1 Tube A (standard tube). absorb the lead standard working solution (containing
not less than 10 μg), whose lead content is equivalent to the specified heavy metal
limit, pour into a 50 mL Nessler tube (if the specimen is treated, the same quantity of
reagent blank solution as the specimen solution shall be absorbed meanwhile), add
water to 25 mL, mix up, add 1 drop of phenolphthalein indicator solution, use diluted
hydrochloric acid (6 mol/L) or diluted ammonia hydroxide (1 mol/L) to adjust the pH to
neutral (when the phenolphthalein red just fades), add 5 mL of acetate buffer solution
of pH 3.5, and mix up as standby.
6.2 Tube B (specimen tube). take one Nessler tube matched with tube A, add 10 mL
~ 20 mL (or an appropriate quantity) of specimen solution, add water to 25 mL, mix up,
add 1 drop of 1% phenolphthalein indicator solution, use diluted hydrochloric acid (6
mol/L) or diluted ammonia hydroxide (1 mol/L) to adjust the pH to neutral (when the
phenolphthalein red just fades), add 5 mL of acetate buffer solution of pH 3.5, and mix
up as standby.
6.4 Add 10 mL of freshly-prepared hydrogen sulphide saturated solution to all tubes,
add water to the 50 mL scale, mix up, observe on the white background after placing
in a dark place for 5 min.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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