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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
Status: Valid GB/T 17418.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 17418.2-2010 | English | 189 |
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Methods for analysis of noble metals in geochemical samples -- Part 2: Determination of platinum and rhodium content -- Preconcentration by thiourea-catalytic polarographic method
| Valid |
GB/T 17418.2-2010
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| GB/T 17418.2-1998 | English | 199 |
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Methods for analysis of noble metals in geochemical samples--Determination of platinum and rhodium content-Preconcentration by thiourea-Catalytic polarographic method
| Obsolete |
GB/T 17418.2-1998
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PDF similar to GB/T 17418.2-2010
Basic data | Standard ID | GB/T 17418.2-2010 (GB/T17418.2-2010) | | Description (Translated English) | Methods for analysis of noble metals in geochemical samples -- Part 2: Determination of platinum and rhodium content -- Preconcentration by thiourea-catalytic polarographic method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | D46 | | Classification of International Standard | 73.060 | | Word Count Estimation | 8,813 | | Date of Issue | 2010-11-10 | | Date of Implementation | 2011-02-01 | | Older Standard (superseded by this standard) | GB/T 17418.2-1998 | | Quoted Standard | GB/T 17418.1 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.8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 geochemical samples Determination of platinum and rhodium. This section applies to the determination of platinum and rhodium containing platinum group elements in geological materials ultrabasic rocks. Measurement range, quality score, said: Platinum 2 ng/g ~ 5 ��g/g, rhodium 1 ng/g ~ 0. 5 ��g/g. | 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
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Methods for analysis of noble metals in geochemical samples Part 2. Determination of platinum and rhodium content Preconcentration by thiourea-catalytic polarographic method.
ICS 73.060
D46
National Standards of People's Republic of China
Replacing GB/T 17418.2-1998
Analysis of noble metals in geochemical samples
Part 2. platinum and rhodium content determination
Enrichment thiourea - Catalytic polarographic
Part 2. Determinationofplatinumandrhodiumcontent-
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 17418 Part 2.
Catalytic polarographic determination - in this section instead of GB/T 17418.2-1998 "analysis of noble metals in geochemical samples enriched thiourea
Platinum and rhodium content. "
This section compared with the GB/T 17418.2-1998, the main changes are as follows.
--- Increased warnings;
--- Clearly indicate the mass fraction measurement range;
--- Specification standard noun;
--- Modify simplifies sample scale test solution dispensing scale content;
--- Change some sequence of reagents and samples sulfide bake conditions;
--- Change the sequence number of part reagent;
--- Additional modifications to the contents of the result of the calculation.
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, Zhang Mingjie.
This part of the standard replaces the previous editions are.
--- GB/T 17418.2-1998.
Analysis of noble metals in geochemical samples
Part 2. platinum and rhodium content determination
Enrichment thiourea - Catalytic polarographic
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 geochemical samples determination of platinum and rhodium.
This section applies to the determination of platinum and rhodium-containing platinum group elements in geological materials ultrabasic rocks. Measurement range, mass fraction, said. Platinum
2ng/g ~ 5μg/g; Rh 1ng/g ~ 0.5μg/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 the sample by burning sulfur and organic matter, sodium peroxide decomposition, water extraction to sulfuric acid, hydrofluoric acid plus evaporation smoke except silicon. In concentrated sulfuric
Acid medium, when heated to 230 ℃, thiourea and platinum, palladium, rhodium, iridium and other platinum group elements generated sulfide precipitation to separate with a large base metals.
Plus nitric acid - sulfuric acid to dissolve the precipitate and the destruction and removal of the sulfur filter paper, and then lithium sulfate - sodium pyrosulfate melt the platinum group, platinum, rhodium and other elements into
Sulfate complex.
Platinum and rhodium in sulfuric acid - hexamine - - produce high sensitivity catalytic wave Hydrazine sulfate base solution of ammonium chloride. Peak potential of about platinum
-1.00V (Silver electrode). Platinum in the 0.2ng/mL ~ 2ng/mL range with its derivative peak height is linear. Rhodium peak potential of about
It is -1.10V (silver electrode). Rhodium in 0.025ng/mL ~ 0.25ng/mL range, the catalytic current rhodium concentration is not entirely to
Linear relationship, use the curve to calculate the concentration.
Geochemical samples in the platinum content is generally not high, platinum, rhodium can be continuously measured. Under assay conditions, 10mL volume, less than
100ng platinum rhodium does not interfere with the determination, but a lot of platinum should be separated. 10mgPb, Co, Bi, Mo, 2mgCu, Ni, Cr, 200μgZn, 100μg
As, Tl, 10μgAu, Se, Pd, 5μgIr, Os, 2μgRu, 1μgTe, 0.1μgRh not interfere with the determination of platinum. NO3- serious interference should
Rush to make.
4 Reagents
4.1 hydrochloride (ρ1.19g/mL).
Nitrate 4.2 (ρ1.42g/mL).
4.3 sulfate (ρ1.84g/mL).
4.4 sulfuric acid (11), warning --- improper dilution risk prone.
4.5 hydrofluoric acid (ρ1.15g/mL), warning of toxic and corrosive hydrofluoric acid ---, the operation should wear gloves to prevent skin contact.
4.6 phosphoric acid (ρ1.69g/mL).
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