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Methods for chemical analysis of precious metals alloys electroplating wastewater - Part 2: Determination of zinc, manganese, chromium, cadmium, lead, iron, aluminium, nickel, copper and beryllium contents - Inductively coupled plasma-atomic emission spec
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GB/T 43753.2-2024: Methods for chemical analysis of precious metals alloys electroplating wastewater - Part 2: Determination of zinc, manganese, chromium, cadmium, lead, iron, aluminium, nickel, copper and beryllium contents - Inductively coupled plasma-atomic emission spec
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GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 77.120.99
CCS H 15
Methods for chemical analysis of precious metals alloys
electroplating wastewater - Part 2.Determination of zinc,
manganese, chromium, cadmium, lead, iron, aluminum,
nickel, copper and beryllium contents - Inductively coupled
plasma-atomic emission spectrometry
Issued on: MARCH 15, 2024
Implemented on: OCTOBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Principle... 7
5 Reagents and materials... 7
6 Instruments and equipment... 9
7 Samples... 9
8 Test procedure... 9
9 Experimental data processing... 11
10 Precision... 11
11 Test report... 13
Appendix A (Informative) Recommended analytical spectral line wavelengths and
instrument operating parameters... 15
Appendix B (Informative) Precision test original data... 16
Methods for chemical analysis of precious metals alloys
electroplating wastewater - Part 2.Determination of zinc,
manganese, chromium, cadmium, lead, iron, aluminum,
nickel, copper and beryllium contents - Inductively coupled
plasma-atomic emission spectrometry
Warning -- Personnel using this document must have prior experience working in
a formal laboratory. This document does not address all potential safety issues.
Users are responsible for taking appropriate safety and health precautions and
ensuring compliance with relevant national regulations.
1 Scope
This document describes a method for determining the contents of zinc, manganese,
chromium, cadmium, lead, iron, aluminum, nickel, copper, and beryllium in wastewater
from electroplating and electroforming of precious metal alloys using inductively
coupled plasma atomic emission spectrometry.
This document applies to the determination of zinc, manganese, chromium, cadmium,
lead, iron, aluminum, nickel, copper, and beryllium contents in wastewater from
precious metal alloy electroplating and electroforming. The determination range for
zinc, manganese, chromium, cadmium, lead, iron, aluminum, nickel, copper, and
beryllium is 0.0001 mg/mL~0.1000 mg/mL.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for any dated
reference, only the version corresponding to that date applies to this document; for any
undated reference, the latest version (including all amendments) applies to this
document.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
3 Terms and definitions
This document does not contain any terms or definitions that need to be defined.
4 Principle
After the organic matter in the test specimen is digested with perchloric acid, it is
dissolved in a mixed acid. The contents of zinc, manganese, chromium, cadmium, lead,
iron, aluminum, nickel, copper and beryllium are determined by inductively coupled
plasma atomic emission spectrometry in the mixed acid medium.
5 Reagents and materials
Unless otherwise specified, only reagents confirmed to be of analytical grade shall be
used in the analysis.
5.1 Water, GB/T 6682, Grade II.
5.2 Perchloric acid (ρ=1.76 g/mL).
5.3 Nitric acid (ρ=1.42 g/mL).
5.4 Hydrochloric acid (ρ=1.18 g/mL).
5.5 Hydrogen peroxide (ρ=1.11 g/mL)
5.6 Nitric acid (1+1).
5.7 Hydrochloric acid (1+1).
5.8 Mixed acid (1+3+4). Mix 1 volume of nitric acid (5.3), 3 volumes of hydrochloric
acid (5.4) and 4 volumes of water (5.1) thoroughly, and prepare fresh before use.
5.9 Zinc standard stock solution. Weigh 0.1000 g of metallic zinc (wZn≥99.99%) and
place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6), heat to dissolve,
remove nitrogen oxides, cool to room temperature, transfer to a 100 mL plastic
volumetric flask, and dilute to the mark with water (5.1). Mix well. 1 mL of this solution
contains 1 mg of zinc.
5.10 Manganese standard stock solution. Weigh 0.1000 g of metallic manganese
(wMn≥99.99%) and place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6),
heat to dissolve, remove nitrogen oxides, cool to room temperature, transfer to a 100
mL plastic volumetric flask, dilute to the mark with water (5.1), and mix well. 1 mL of
this solution contains 1 mg of manganese.
5.11 Chromium standard stock solution. Weigh 0.1000 g of metallic chromium
(wCr≥99.99%) and place it in a 100 mL PTFE beaker. Add 1 mL of nitric acid (5.6) and
5 mL of hydrochloric acid (5.7). Cover with a PTFE beaker lid, heat to dissolve, transfer
to a 100 mL plastic volumetric flask, add 10 mL of hydrochloric acid (5.7), and dilute
to the mark with water (5.1). Mix well. 1 mL of this solution contains 1 mg of chromium.
5.12 Cadmium standard stock solution. Weigh 0.1000 g of metallic cadmium
(wCd≥99.99%) and place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6),
heat to dissolve, remove nitrogen oxides, cool to room temperature, transfer to a 100
mL plastic volumetric flask, and dilute to the mark with water (5.1). Mix well. 1 mL of
this solution contains 1 mg of cadmium.
5.13 Lead standard stock solution. Weigh 0.1000 g of metallic lead (wPb≥99.99%) and
place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6), heat to dissolve,
remove nitrogen oxides, cool to room temperature, transfer to a 100 mL plastic
volumetric flask, and dilute to the mark with water (5.1). Mix well. 1 mL of this solution
contains 1 mg of lead.
5.14 Iron standard stock solution. Weigh 0.1000 g of metallic iron (wFe≥99.99%) and
place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6), heat to dissolve,
remove nitrogen oxides, cool to room temperature, transfer to a 100 mL plastic
volumetric flask, and dilute to the mark with water (5.1). Mix well. 1 mL of this solution
contains 1 mg of iron.
5.15 Aluminum standard stock solution. Weigh 0.1000 g of metallic aluminum
(wAl≥99.99%) and place it in a 100 mL PTFE beaker. Add 20 mL of hydrochloric acid
(5.7), heat to dissolve, cool to room temperature, transfer to a 100 mL plastic volumetric
flask using hydrochloric acid (5.7), dilute to the mark with water (5.1), and mix well. 1
mL of this solution contains 1 mg of aluminum.
5.16 Nickel standard stock solution. Weigh 0.1000 g of metallic nickel (wNi≥99.99%)
and place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6), heat to dissolve,
remove nitrogen oxides, cool to room temperature, transfer to a 100 mL plastic
volumetric flask, and dilute to the mark with water (5.1). Mix well. 1 mL of this solution
contains 1 mg of nickel.
5.17 Copper standard stock solution. Weigh 0.1000 g of metallic copper (wCu≥99.99%)
and place it in a 100 mL PTFE beaker. Add 20 mL of nitric acid (5.6), heat to dissolve,
remove nitrogen oxides, cool to room temperature, transfer to a 100 mL plastic
volumetric flask, dilute to the mark with water (5.1), and mix well. 1 mL of this solution
contains 1 mg of copper.
5.18 Beryllium standard stock solution. Weigh 0.1000 g of metallic beryllium
(wBe≥99.95%) and place it in a 100 mL PTFE beaker. Add 20 mL of hydrochloric acid
(5.7), heat until dissolved, cool to room temperature, transfer to a 100 mL volumetric
flask, and dilute to the mark with water (5.1). Mix well. 1 mL of this solution contains
1 mg of beryllium.
5.19 Mixed standard solution of zinc, manganese, chromium, cadmium, lead, iron,
aluminum, nickel, copper, and beryllium. Add 30 mL of hydrochloric acid (5.4) to a
200 mL plastic volumetric flask, transfer 2.00 mL of the standard stock solutions
(5.9~5.18) each to the flask, dilute to the mark with water (5.1), and mix well. 1 mL of
this solution contains 10 μg each of zinc, manganese, chromium, cadmium, lead, iron,
aluminum, nickel, copper, and beryllium.
5.20 Argon (volume fraction≥99.99%).
6 Instruments and equipment
Inductively coupled plasma atomic emission spectrometer. Under optimal operating
conditions, any instrument meeting the following specifications can be used.
a) Light source. Argon plasma light source, and the maximum output power of
the emitter shall not be less than 1.3 kW.
b) Resolution. The optical resolution at around 200 nm is no greater than 0.010
nm; the optical resolution at around 400 nm is no greater than 0.020 nm.
c) Instrument stability. The instrument's stability (RSD) within 1 hour is no
greater than 2.0%.
d) Recommended operating parameters for the inductively coupled plasma
atomic emission spectrometer are given in Appendix A.
7 Samples
The samples are stored in plastic bottles for later use.
8 Test procedure
8.1 Test specimens
Transfer the sample accurately as shown in Table 1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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