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GB/T 15249.4-2009 English PDF

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Q: Should I purchase the latest version GB/T 15249.4-2009?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15249.4-2009 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.

US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 15249.4-2009: Methods for chemical analysis of crude gold -- Part 4: Determination of lead content -- EDTA titrimetric method
Status: Valid

GB/T 15249.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15249.4-2009	139	Add to Cart	3 days	Methods for chemical analysis of crude gold -- Part 4: Determination of lead content -- EDTA titrimetric method	Valid
GB/T 15249.4-1994	199	Add to Cart	2 days	Crude Gold-Determination of lead content-EDTA titrimetric method	Obsolete

Similar standards

GB/T 38744 GB/T 38783 GB/T 15076.3 GB/T 15249.3 GB/T 15249.5 GB/T 15249.2

Basic data

Standard ID: GB/T 15249.4-2009 (GB/T15249.4-2009)
Description (Translated English): Methods for chemical analysis of crude gold -- Part 4: Determination of lead content -- EDTA titrimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H15
Classification of International Standard: 77.120.70
Word Count Estimation: 6,672
Date of Issue: 2009-05-06
Date of Implementation: 2009-10-01
Older Standard (superseded by this standard): GB/T 15249.4-1994
Regulation (derived from): National Standard Approval Announcement 2009 No.6 (Total No.146)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the aggregate qualitative determination of the amount of lead in gold. This section applies to crude gold (mine gold, metallurgical recovery of coarse gold products and gold) Determination of lead content. Determination of lead content range: 1. 00% to 15. 00 %.

GB/T 15249.4-2009: Methods for chemical analysis of crude gold -- Part 4: Determination of lead content -- EDTA titrimetric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Methods for chemical analysis of crude gold Part 4. Determination of lead content EDTA titrimetric method ICS 77.120.70 H15 National Standards of People's Republic of China Replacing GB/T 15249.4-1994 Crude Gold Analysis Part 4. Determination of lead content EDTA titration Posted 2009-05-06 2009-10-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 15249 "Crude Gold analysis method" is divided into the following five sections. --- Part 1. Determination of the amount of gold fire assay gravimetric method; --- Part 2. Determination of the amount of silver fire assay gravimetric and EDTA titration; --- Part 3. Determination of copper content iodometry; --- Part 4. Determination of lead content EDTA titration; --- Part 5. Determination of mercury content - Cold atomic absorption spectrometry. This section GB/T Part of 415,249. This Part replaces GB/T 15249.4-1994 "Determination of lead content Crude Gold analysis method EDTA titration." This section compared with the GB/T 15249.4-1994, have the following main changes. --- Text format has been modified; --- Increased provision sample; --- Increasing the precision of the terms; --- Increased quality assurance and control provisions. This section proposed by the People's Bank of China. This part of the National Standardization Technical Committee on Finance (SAC/TC180) centralized. This section is responsible for drafting the Changchun Gold Research Institute. This part by the Chengdu Banknote Printing Company, Beijing Mining Research Institute, Shenyang Mint, Shanghai and Nanjing Mint Mint participated in the drafting. The main drafters of this section. Feifei Chen, Huang Rui, Liu Feng, Yu Li, Chen Jie, Wang Zisen, Laimao Ming, Wang Yu, Zhang Bo. This part of the standard replaces the previous editions are. --- GB/T 15249.4-1994. Crude Gold Analysis Part 4. Determination of lead content EDTA titration

1 Scope

This section GB/T 15249 specifies the method for determination of lead content in crude gold. This section applies to the determination of lead content (gold ore, metallurgical products and crude gold recovery of gold, etc.) in crude gold. Determination of lead content range. 1.00% to 15.00%.

2 principle of the method

Sample with dilute nitric acid, hydrochloric acid decomposition, with precipitation of silver chloride, silver and gold in order to restore a single gold sulfite separated sulfuric acid is added to sulfur in lead Lead acid precipitate filtered to coexist with the separation of elements. With acetic acid - sodium acetate buffer solution to dissolve lead sulfate, xylenol orange as indicator in Under pH5.5 ~ 6.0, the titration with EDTA standard solution titration, calculate the mass lead by EDTA standard solution volume consumed fraction.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity. 3.1 hydrochloride (ρ1.19g/mL). 3.2 HCl (2 + 98). Nitrate 3.3 (ρ1.42g/mL). 3.4 nitric acid (1 + 1). 3.5 sulfate (1 + 1). 3.6 sulfate (24 + 1). 3.7 sulfate (2 + 98). 3.8 sulfite (ρ1.03g/mL). 3.9 ethanol. 3.10 acetic acid - sodium acetate buffer solution (pH5.5 ~ 6.0). The 375g of anhydrous sodium acetate dissolved in water, 50mL glacial acetic acid was added, washed with water Diluted to 2.5L. 3.11 xylenol orange indicator solution (5g/L). add 1 to 2 drops of ammonia (1 + 1) in 50mL solution. Use within 1 week. 3.12 Lead standard solution. Weigh 2.0000g metallic lead (w1 (Pb) ≥99.99%) in 250mL beaker, add 40mL of nitric acid (3.4), covered with a watch glass placed on a hot plate, heated and dissolved low temperature, until complete dissolution of the oxides of nitrogen purge boiling, removed, cooled to room temperature. Moved into 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL lead 2mg. 3.13 disodium edetate (Na2EDTA) standard titration solution [Ba (Na2EDTA) ≈0.01mol/L]. 3.13.1 preparation. Weigh 18g disodium edetate (Na2EDTA) placed in 400mL beaker, add water 200mL heat gently to dissolve, Cooled to room temperature, diluted to 5L, and mix. 3.13.2 Calibration. Pipette three 20.00mL lead standard solution (3.12), were placed in 250mL beaker, add 10mL sulfuric acid (3.5), Low-temperature heating to take trioxide smoke, remove the cooled, washed with water Beibi, then low heat until smoke disappears, remove the cooling. Analysis by the following steps 5.3.4 ~ 5.3.6 conduct. According to equation (1) to calculate the actual concentration Na2EDTA standard titration solution. Ba Ba = 0 · Vp 1 × 1000 (Vp Vp 2- 0) × 207.2 (1) ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 15249.4-2009_English be delivered?

Answer: Upon your order, we will start to translate GB/T 15249.4-2009_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 15249.4-2009_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 15249.4-2009_English will be deemed to be sold to your employer/organization who actually pays 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+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 15249.4-2009?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 15249.4-2009 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.