GB/T 17418.4-2010 English PDF

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GB/T 17418.4-2010: Methods for analysis of noble metals in geochemical samples -- Part 4: Determination of iridium content -- Preconcentration by thiourea-catalytic spectrophotometric method
Status: Valid

GB/T 17418.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 17418.4-2010	189	Add to Cart	3 days	Methods for analysis of noble metals in geochemical samples -- Part 4: Determination of iridium content -- Preconcentration by thiourea-catalytic spectrophotometric method	Valid
GB/T 17418.4-1998	199	Add to Cart	2 days	Methods for analysis of noble metals in geochemical samples--Determination of iridium content-Preconcentration by thiourea-Catalytic spectrophotometric method	Obsolete

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Basic data

Standard ID: GB/T 17418.4-2010 (GB/T17418.4-2010)
Description (Translated English): Methods for analysis of noble metals in geochemical samples -- Part 4: Determination of iridium content -- Preconcentration by thiourea-catalytic spectrophotometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D46
Classification of International Standard: 73.060
Word Count Estimation: 8,817
Date of Issue: 2010-11-10
Date of Implementation: 2011-02-01
Older Standard (superseded by this standard): GB/T 17418.4-1998
Quoted Standard: GB/T 17418.1
Regulation (derived from): National Standard Approval Announcement 2010 No.8 (Total No.163)
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 method for the determination of iridium in geochemical samples. This section applies to the determination of iridium in geological materials ultrabasic rocks containing platinum group elements. Measurement range, quality score indicates: 1ng/g ~ 5��g/g.

GB/T 17418.4-2010: Methods for analysis of noble metals in geochemical samples -- Part 4: Determination of iridium content -- Preconcentration by thiourea-catalytic spectrophotometric 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 analysis of noble metals in geochemical samples Part 4. Determination of iridium content Preconcentration by thiourea-catalytic spectrophotometric method. ICS 73.060 D46 National Standards of People's Republic of China Replacing GB/T 17418.4-1998 Analysis of noble metals in geochemical samples Part 4. Determination of the amount of iridium Enrichment thiourea - Catalytic spectrophotometry Part 4. Determinationofiridiumcontent- Issued on. 2010-11-10 2011-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 17418 "analysis of noble metals in geochemical samples Method" is divided into seven parts. --- Part 1. General rules and regulations; --- Part 2. platinum and rhodium content - Determination of thiourea enrichment - catalytic polarography; --- Part 3. Determination of palladium content - Preconcentration by thiourea - Graphite furnace atomic absorption spectrophotometry; --- Part 4. Determination of the amount of iridium-enriched thiourea - Catalytic spectrophotometry; --- Part 5. Determination of the amount of ruthenium and osmium distillation - Catalytic spectrophotometry; --- Part 6. platinum, palladium and gold contents - fire assay enrichment - Emission Spectrometry; --- Part 7. Determination of nickel sulphide fire assay gold platinum group elements - Inductively Coupled Plasma Mass Spectrometry. This section GB/T Part of 417,418. This Part replaces GB/T 17418.4-1998 "analysis of noble metals in geochemical samples enriched thiourea - Catalytic spectrophotometry Determination of the amount of iridium. " This section compared with the GB/T 17418.4-1998, the main changes are as follows. --- Increased warning; --- Clearly indicate the mass fraction measurement range; --- Instrument adds balance; --- Specification standard noun; --- The "standard sample" to "standard material"; --- Modify supplements the results of the calculation; --- Modify simplifies sample scale test solution dispensing scale content; --- Change some sequence of reagents and samples sulfide bake conditions. This section presents the People's Republic of China Ministry of Land Resources. This part of the National Standardization Technical Committee under the jurisdiction of Land and Resources. This section is responsible for drafting. National geology test center. This section is drafted. Zhejiang Institute of Geology and Mineral Resources. The main drafters of this section. Zheng deposit Jiang Hu Yongping, Sun Chaoyang. This part of the standard replaces the previous editions are. --- GB/T 17418.4-1998. Analysis of noble metals in geochemical samples Part 4. Determination of the amount of iridium Enrichment thiourea - Catalytic spectrophotometry Warning --- Use this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

GB/T 17418 provisions of this part of the determination of iridium in geochemical samples. This section applies to the determination of iridium in geological materials ultrabasic rocks containing platinum group elements. Measurement range, the mass fraction expressed. 1ng/g ~ 5μg/g.

2 Normative references

The following documents contain provisions which, through reference GB/T 17418 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 17418.1 precious metal analysis methods General rules and regulations in geochemical samples Principle 3 In addition to burning through the sample after sulfur and organic matter, sodium peroxide decomposition. Water extraction to sulfuric acid, hydrofluoric acid added in addition to silicon. In concentrated sulfuric acid medium Stroma, when heated to 230 ℃, thiourea and iridium, rhodium, platinum, palladium and other precious metal elements generate sulfide precipitation to separate with a large base metals. plus Nitric acid - sulfuric acid to dissolve and destroy the filter paper and precipitate sulfur. Then lithium sulfate - sodium pyrosulfate melt, iridium, rhodium, platinum group elements into sulphate Complex. Iridium can catalyze the use of cerium (Ⅳ) - oxidation of arsenic (Ⅲ) reduction reaction system, and the catalytic reaction rate is proportional to the concentration of iridium, whereby Determination of Trace Iridium. When using a fixed concentration, determination scope is 2ng/mL ~ 10ng/mL; fixed time method is 0.2ng/mL ~ 2ng/mL. The reaction time can be measured down to 0.01ng/mL iridium.

4 Reagents

4.1 hydrochloride (ρ1.19g/mL). Nitrate 4.2 (ρ1.42g/mL). 4.3 sulfate (ρ1.84g/mL). 4.4 sulfate (11). Warning --- improper dilution risk prone. Sulfuric acid 4.5 c (H2SO4) = 1mol/L. 4.6 Hydrofluoric acid (ρ1.15g/mL). Warning --- toxic and corrosive hydrofluoric acid, care. 4.7 phosphoric acid (ρ1.69g/mL). 4.8 perchloric acid (ρ1.67g/mL). Warning --- explosive materials, carefully. Sodium chloride solution 4.9 ω (NaCl) = 20%. 4.10 hydrogen peroxide (ρ1.11g/mL). 4.11 sodium peroxide. ......

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