GB/T 17418.4-2010Methods for analysis of noble metals in geochemical samples - Part 4: Determination of iridium content - Preconcentration by thiourea-catalytic spectrophotometric method (English PDF)
地球化学样品中贵金属分析方法 第4部分：铱量的测定 硫脲富集-催化分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 10, 2010
Implementation date
February 1, 2011
Scope
GB/T 17418.4-2010 is the English-translated version of 地球化学样品中贵金属分析方法 第4部分：铱量的测定 硫脲富集-催化分光光度法.
GB/T 17418.4-2010 is the Chinese standard "Methods for analysis of noble metals in geochemical samples - Part 4: Determination of iridium content - Preconcentration by thiourea-catalytic spectrophotometric method".
Its scope clause reads: 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. Its clauses include reagents.
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Document preview — GB/T 17418.4-2010
National Standard of the People's Republic of China
- ICS
- 73.060
- Classification
- D 46
- Replacing
- GB/T 17418.4-1998
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 4 Reagents
- 4.4 sulfate (11)
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 °C, 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 (rho1.19g/mL).
Nitrate 4.2 (rho1.42g/mL).
4.3
sulfate (rho1.84g/mL).
4.4 sulfate (11)
Warning --- improper dilution risk prone.
Sulfuric acid 4.5 c (H2SO4) = 1mol/L.
4.6
Hydrofluoric acid (rho1.15g/mL). Warning --- toxic and corrosive hydrofluoric acid, care.
4.7
phosphoric acid (rho1.69g/mL).
4.8
perchloric acid (rho1.67g/mL). Warning --- explosive materials, carefully.
Sodium chloride solution 4.9 omega (NaCl) = 20%.
4.10
hydrogen peroxide (rho1.11g/mL).
4.11
sodium peroxide.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 17418.4
| Edition | Title | Revision | Status |
|---|---|---|---|
| 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 | current edition | Current |
| GB/T 17418.4-1998 | Methods for analysis of noble metals in geochemical samples - Part 4: Determination of iridium content - Preconcentration by thiourea-catalytic spectrophotometric method | previous edition | Superseded |
This page sells the current edition, GB/T 17418.4-2010. Earlier editions are listed for reference only.
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Related Standards
GB/T 17418.1-2010 — Methods for analysis of noble metals in geochemical samples - Part 1: General rules and regulations
GB/T 17418.2-2010 — Methods for analysis of noble metals in geochemical samples - Part 2: Determination of platinum and rhodium content-Preconcentration by thiourea-catalytic polarographic method
GB/T 17418.3-2010 — Methods for analysis of noble metals in geochemical samples - Part 3: Determination of palladium content - Preconcentration by thiourea - graphite furnace atomic absorption spectrophotometric method
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GB/T 17418.4-2010
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