GB/T 40114-2021 English PDF (GBT40114-2021)

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GB/T 40114-2021: Jewellery - Determination of precious metal content - Difference method usinginductively coupled plasma optical emission spectroscopy
GB/T 40114-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 39.060
CCS Y 88
Replacing GB/T 21198.6-2007
Jewellery – Determination of Precious Metal Content –
Difference Method Using Inductively Coupled Plasma
Optical Emission Spectroscopy
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Principle ... 6
5 Reagents and Materials ... 6
6 Instruments ... 8
7 Test Procedures ... 9
8 Calculation of Results ... 10
9 Repeatability ... 11
10 Test Report ... 11
Appendix A (Informative) Recommended Test Analysis Line ... 13
Jewellery – Determination of Precious Metal Content –
Difference Method Using Inductively Coupled Plasma
Optical Emission Spectroscopy
1 Scope
This Document specifies a method for determining the content of precious metals by
determining the content of impurity elements in gold, platinum, and palladium alloy
jewellery.
This Document is applicable to gold alloy jewellery with gold content of 725‰~999‰,
platinum alloy jewellery with platinum content of 800‰~999‰, and palladium alloy
jewellery with palladium content of 800‰~999‰.
NOTE: The applicable measurement range of the precious metal content is the range covered
by the precision test. It may also be applicable beyond this range, but the laboratory is required
to verify the test beyond the range.
2 Normative References
The following documents are essential to the application of this Document. For the
dated documents, only the versions with the dates indicated are applicable to this
Document; for the undated documents, only the latest version (including all the
amendments) is applicable to this Document.
GB/T 12806-2011 Laboratory Glassware - One-Mark Volumetric Flasks
GB/T 12808-2015 Laboratory Glassware - One Mark Pipettes
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions that shall be
given.
ratio of 3:1, and it is prepared immediately before use.
5.17 Gold standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure gold (5.2); place it in a 50mL beaker. Add 10mL of mixed
acid (5.16) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask; add 105mL of hydrochloric acid (5.13); dilute to the mark with water
and shake well.
5.18 Palladium standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure palladium (5.3); place it in a 50mL beaker. Add 10mL of
mixed acid (5.16) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask’ add 105mL of hydrochloric acid (5.13); dilute to the mark with water
and shake well.
5.19 Silver standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure silver (5.4); place it in a 50mL beaker. Add 10mL of nitric
acid (5.15) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask pre-filled with 92mL of hydrochloric acid (5.11). Wash the beaker with
a small amount of water; incorporate the lotion into a volumetric flask; shake until the
precipitate is dissolved. Dilute to the mark with hydrochloric acid (5.14), and shake well.
5.20 Copper standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure copper (5.5); place it in a 50mL beaker. Add 10mL of
nitric acid (5.15) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask; add 115mL of hydrochloric acid (5.13); and dilute with water to the
mark, and shake well.
5.21 Nickel standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure nickel (5.6); place it in a 50mL beaker. Add 10mL of nitric
acid (5.15) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask; add 115mL of hydrochloric acid (5.13); dilute with water to the mark,
and shake well.
5.22 Cobalt standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure cobalt (5.7); place it in a 50mL beaker. Add 10mL of nitric
acid (5.15) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask; add 120mL of hydrochloric acid (5.13); dilute with water to the mark,
and shake well.
5.23 Iron standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure iron (5.8); place it in a 50mL beaker. Add 10mL of
hydrochloric acid (5.13) solution; slowly heat to dissolve. After cooling, transfer to a
500mL volumetric flask; add 120mL of hydrochloric acid (5.13); dilute with water to the
mark, and shake well.
5.24 Zinc standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure zinc (5.9); place it in a 50mL beaker. Add 10mL of
hydrochloric acid (5.13) solution; slowly heat to dissolve. After cooling, transfer to a
500mL volumetric flask; add 120mL of hydrochloric acid (5.13); dilute with water to the
mark, and shake well.
5.25 Cadmium standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure cadmium (5.10); place it in a 50mL beaker. Add 10mL of
mixed acid (5.16) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask, add 115mL of hydrochloric acid (5.13); dilute with water to the mark,
and shake well.
5.26 Platinum standard stock solution (200μg/mL):
Weigh (100±0.01) mg of pure platinum (5.1); place it in a 50mL beaker. Add 10mL of
mixed acid (5.16) solution; slowly heat to dissolve. After cooling, transfer to a 500mL
volumetric flask; add 115mL of hydrochloric acid (5.13); dilute to the mark with water,
and shake well.
5.27 Standard stock solutions or mixed standard stock solutions of iridium, rhodium,
ruthenium, bismuth, manganese, lead, tin, magnesium, silicon, arsenic, antimony, and
chromium:
National certified standard samples or standard substances may be purchased.
6 Instruments
6.1 Inductively coupled plasma emission spectrometer: wavelength resolution ≤
0.01nm. The detection limit of the measured element is better than 0.02mg/L, and it
has a background correction function.
6.2 Micro-electronic balance: The actual graduation value is no more than 0.01mg; and
the accuracy level is Level- .
6.3 Single line pipette: Class-A in GB/T 12808-2015. Or adjustable pipette.
6.4 Single line volumetric flask: Class-A in GB/T 12806-2011.
ρi – concentration of the tested elements of the specimen solution, in µg/mL;
ρi0 – concentration of the tested elements of the blank solution, in µg/mL;
V – volume of the specimen solution, in mL;
m – mass of the specimen, in mg.
If ρi - ρi0 ≤ limit of detection, take the limit of detection as the (ρi - ρi0) value to introduce
for calculation; thereof, the limit of detection is 3 times the standard deviation of the 11
test results of the concentration of each element in the corresponding reagent blank
solution.
According to the relative intensity of the target element of the unknown sample, use
the calibration curve to calculate the content of the element to be measured. The test
result of the element to be tested shall be within the content range of a series of
calibration samples used in the calibration curve.
8.2 Calculation of precious metal content
The precious metal content ω is expressed in‰; and calculated according to Formula
(2):
The calculation results shall be expressed to one digit after the decimal point.
9 Repeatability
If the absolute difference of the total amounts of the test...