Path: Home > GB/T > Page448 > GB/T 20975.25-2020 || Home > Standard_List > GB/T > Page448 > GB/T 20975.25-2020
GB/T 20975.25-2020 English PDF
Price & DeliveryUS$230.00 · In stock · Download in 9 secondsGB/T 20975.25-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 25: Determination of elements content--Inductively coupled plasma atomic emission spectrometric method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
GB/T 20975.25: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20975.25-2020 | English | 230 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Methods for chemical analysis of aluminium and aluminium alloys - Part 25: Determination of elements content--Inductively coupled plasma atomic emission spectrometric method
| Valid |
| GB/T 20975.25-2008 | English | 439 |
Add to Cart
|
3 days
|
Methods for chemical analysis of aluminium and aluminium alloys -- Part 25: Inductively coupled plasma atomic emission spectrometric method
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 20975.25-2020
GB/T 20975.25-2020: Methods for chemical analysis of aluminium and aluminium alloys - Part 25: Determination of elements content--Inductively coupled plasma atomic emission spectrometric method
---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/GBT20975.25-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.10
H 12
Replacing GB/T 20975.25-2008
Methods for chemical analysis of aluminium and aluminium
alloys -- Part 25.Determination of elements content --
Inductively coupled plasma atomic emission spectrometric
method
Issued on: JUNE 02, 2020
Implemented on: APRIL 01, 2021
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 7
3 Terms and definitions... 7
4 Method summary... 7
5 Reagents... 8
6 Instruments... 9
7 Specimens... 9
8 Analysis steps... 9
9 Processing of test data... 13
10 Precision... 14
11 Test reports... 14
Annex A (informative) Preparation of standard stock solutions... 16
Annex B (informative) Recommended elemental spectral lines... 22
Methods for chemical analysis of aluminium and aluminium
alloys -- Part 25.Determination of elements content --
Inductively coupled plasma atomic emission spectrometric
method
WARNING -- Personnel using this Part shall have formal laboratory work
experience. This Part 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 Part of GB/T 20975 specifies the determination of the contents of silicon, iron,
copper, gallium, magnesium, manganese, chromium, nickel, zinc, titanium, silver,
boron, bismuth, lithium, lead, tin, vanadium, zirconium, barium, beryllium, calcium,
cadmium, cobalt, erbium, hafnium, indium, potassium, sodium, molybdenum,
neodymium, phosphorus, antimony, scandium, strontium, tungsten, yttrium, and
ytterbium in aluminum and aluminum alloys by inductively coupled plasma atomic
emission spectrometric method.
This Part applies to the determination of the contents of silicon, iron, copper, gallium,
magnesium, manganese, chromium, nickel, zinc, titanium, silver, boron, bismuth,
lithium, lead, tin, vanadium, zirconium, barium, beryllium, calcium, cadmium, cobalt,
erbium, hafnium, indium, potassium, sodium, molybdenum, neodymium, phosphorus,
antimony, scandium, strontium, tungsten, yttrium, and ytterbium in aluminum and
aluminum alloys. The determination range is shown in Table 1.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 8005.2, Terms of aluminium and aluminium alloys -- Part 2.Chemical
analysis
GB/T 8170-2008, Specifications of amusement rides battery car category
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 8005.2
apply.
4 Method summary
Depending on the type of alloy and the content of elements, the following method is
used to dissolve the specimen.
- Specimens decomposed by hydrochloric acid and hydrogen peroxide;
- Specimens decomposed by a mixture of hydrochloric acid and nitric acid;
- Specimens decomposed by sodium hydroxide solution and hydrogen peroxide;
- Specimens decomposed by a mixture of hydrochloric acid and nitric acid, and
hydrofluoric acid.
After specimen decomposition, inductively coupled plasma atomic emission
spectrometry (ICP-AES) is used for determination. The matrix matching method is used
to correct for the influence of the matrix on the determination.
5 Reagents
Unless otherwise specified, only reagents confirmed to be analytically pure and
laboratory Grade II water are used in the analysis.
5.1 Pure aluminum (wAl ≥ 99.999%).
5.2 Hydrogen peroxide (ρ =1.10 g/mL).
5.3 Hydrochloric acid (ρ =1.19 g/mL), guaranteed reagent.
5.4 Nitric acid (ρ =1.42 g/mL), guaranteed reagent.
5.5 Hydrofluoric acid (ρ =1.14 g/mL), guaranteed reagent.
5.6 Perchloric acid (ρ =1.76 g/mL), guaranteed reagent.
5.7 Hydrochloric acid (1+1).
5.8 Nitric acid (1+1).
5.9 Mixed acid. mix 3 portions of hydrochloric acid (5.7) and 1 portion of nitric acid
(5.8).
5.10 Sodium hydroxide solution (400 g/L).
5.11 Aluminum-based solution (20 mg/mL). Weigh 20.00 g of pure aluminum (5.1) into
a 1000 mL beaker. Cover with a watch glass. Add hydrochloric acid (5.7) in portions,
totaling 600 mL. After the vigorous reaction stops, heat slowly until completely
dissolved. Then add a few drops of hydrogen peroxide (5.2). Boil for several minutes.
Cool. Transfer the solution to a 1000 mL volumetric flask. Dilute to the mark with water.
Shake well.
5.12 Standard stock solutions for each analytical element. preferably prepared using
certified national standard solutions; or see Annex A.
5.13 Standard solution.
a) Principles for preparing multi-element standard solutions. Elements that
chemically interfere with each other, produce precipitation, or cause spectral
interference shall be prepared in groups.
b) Dilute the standard stock solution (5.12) to 100 μg/mL. Maintain the same acidity
as the standard stock solution (dilute before use).
c) Dilute the standard stock solution (5.12) to 10 μg/mL. Maintain the same acidity
as the standard stock solution (dilute before use).
6 Instruments
Inductively coupled plasma atomic emission spectrometer. The instrument shall meet
the following conditions.
- The spectrometer has vacuum or gas-expelling functions to ensure stable test
signals for elements at wavelengths below 200 nm.
- The instrument's resolution is less than 0.005 nm (at 200 nm).
7 Specimens
Process the sample into fragments with a thickness of no more than 1 mm.
8 Analysis steps
8.1 Test material
According to the sample dissolution method adopted, weigh the corresponding mass
(m0) of the specimen (Chapter 7) according to Table 2 or Table 3, accurate to 0.0001 g.
not allow the filter paper to burn). Then ignite at 800℃ for 5 min. Cool. Add 5 mL of
hydrofluoric acid (5.5). Add nitric acid (5.8) dropwise until the solution is clear. Add 1
mL of perchloric acid (5.6). Heat to evaporate to dryness. Cool. Dissolve the residue
with 5 mL of hydrochloric acid (5.7). Combine this test solution with the original filtrate.
Dilute to the mark. Mix well. If necessary, dilute the test solution according to the
working curve range.
8.4.2 Dissolution method II
8.4.2.1 This dissolution method is applicable to the determination of the contents of
iron, copper, magnesium, manganese, gallium, titanium, vanadium, indium, tin, lead,
bismuth, antimony, chromium, zinc, nickel, cadmium, beryllium, boron, strontium,
calcium, silver, barium, cobalt, lithium, molybdenum, neodymium, yttrium, ytterbium,
and scandium in aluminum and aluminum alloys.
8.4.2.2 Place the test material (8.1) weighed according to Table 2 into a 250 mL beaker.
Add 25 mL of mixed acid (5.9). After the vigorous reaction stops, heat at a low
temperature until the test material is completely dissolved. Cool to room temperature.
8.4.2.3 When the silicon mass fraction is greater than 0.5%, if there is insoluble residue,
filter the test solution into a volumetric flask of the corresponding volume in Table 2.
Wash the residue. Place the residue along with the filter paper in a platinum crucible.
Ash (do not allow the filter paper to burn). Then ignite at 800℃ for 5 min. Cool. Add
5 mL of hydrofluoric acid (5.5). Add nitric acid (5.8) dropwise until the solution is clear.
Add 1 mL of perchloric acid (5.6). Heat to evaporate to dryness. Cool. Dissolve the
residue with 5 mL of hydrochloric acid (5.7). Combine this test solution with the
original filtrate. Dilute to the mark. Mix well. If necessary, dilute the test solution
according to the working curve range.
8.4.3 Dissolution method III
8.4.3.1 This dissolution method is applicable to the determination of silicon, iron,
copper, magnesium, manganese, titanium, boron, vanadium, chromium, zinc, nickel,
zirconium, strontium, tin, antimony, lead, calcium, tungsten, ytterbium, erbium,
neodymium, and scandium in aluminum and aluminum alloys.
8.4.3.2 Place the test material (8.1) weighed according to Table 3 into a 400 mL
polytetrafluoroethylene beaker. Add a small amount of water. Add 6 mL of sodium
hydroxide solution (5.10). After the vigorous reaction stops, decompose by heating at a
low temperature. Add an appropriate amount of hydrogen peroxide (5.2). Heat slowly
until the test material is completely dissolved. Evaporate the solution to a slurry. Cool
slightly. Add about 30 mL of water. Heat slowly until completely dissolved.
8.4.3.3 Dilute the solution (8.4.3.1) with water to approximately 100 mL. While stirring,
add 25 mL of nitric acid (5.8) and 25 mL of hydrochloric acid (5.7). Heat at a low
temperature until completely dissolved (if a brown precipitate of manganese dioxide
forms, add anhydrous sodium sulfite solution). Cool. Transfer the solution to a 250 mL
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 20975.25-2020 be delivered?Answer: The full copy PDF of English version of GB/T 20975.25-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 20975.25-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20975.25-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 20975.25-2020 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 20975.25-2020?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20975.25-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 20975.25-2020?A step-by-step guide to download PDF of GB/T 20975.25-2020_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as USD, Euro, KRW, JPY, AUD, CAD, RMB, IDR, INR, THB, HKD etc.).
Step 2: Search keyword "GB/T 20975.25-2020".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 | Steps 4~6 | Step 7 | Step 8 | Step 9
|