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SN/T 4658-2016: Simultaneous determination of arsenic and mercury content in fluorspar--Microwave digestion-atomic fluorescence spectrometry
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| SN/T 4658-2016 | English | 229 |
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Simultaneous determination of arsenic and mercury content in fluorspar--Microwave digestion-atomic fluorescence spectrometry
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SN/T 4658-2016
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Basic data | Standard ID | SN/T 4658-2016 (SN/T4658-2016) | | Description (Translated English) | Simultaneous determination of arsenic and mercury content in fluorspar--Microwave digestion-atomic fluorescence spectrometry | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | D50 | | Word Count Estimation | 10,167 | | Date of Issue | 2016-12-12 | | Date of Implementation | 2017-07-01 | | Regulation (derived from) | State-Quality-Inspection-Accredidation (2016) No.590 | | Issuing agency(ies) | General Administration of Customs | SN/T 4658-2016: Simultaneous determination of arsenic and mercury content in fluorspar--Microwave digestion-atomic fluorescence spectrometry
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(Simultaneous Determination of Arsenic and Mercury in Fluorite by Microwave Digestion - Atomic Fluorescence Spectrometry)
People's Republic of China Entry-Exit Inspection and Quarantine Industry Standard
Simultaneous determination of arsenic and mercury in fluorite
Microwave digestion-atomic fluorescence spectrometry
Released on December 12,.2016
2017-07-01 implementation
People's Republic
The General Administration of Quality Supervision, Inspection and Quarantine issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the National Certification and Accreditation Administration.
This standard was drafted. Shanghai Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China.
The main drafters of this standard. Xu Jie, Qin Yuqiong, Xu Ding, Chen Jie, Zhou Haiming, Liu Wei.
Simultaneous determination of arsenic and mercury in fluorite
Microwave digestion-atomic fluorescence spectrometry
1 Scope
This standard specifies the simultaneous determination of arsenic and mercury in fluorite by microwave digestion-atomic fluorescence spectrometry.
This standard applies to the detection of arsenic and mercury in fluorite. Lower limit of determination of arsenic and mercury. arsenic 0.39 μg/g, mercury 0.02 μg/g.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6379.2 Accuracy of measurement methods and measurement results (accuracy and precision) Part 2. Determining standard measurement methods
Basic method of repeatability and reproducibility
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 21191 Atomic Fluorescence Spectrometer
GB/T 22564 Fluorite sampling and sample preparation
YB/T 5217 fluorite
3 Method summary
After the sample is digested by microwave, the arsenic (V) is first reduced to arsenic (III) with thiourea-ascorbic acid in a hydrochloric acid medium, in the hydride generator.
In the middle, arsenic and mercury are reduced to their hydride by potassium borohydride, introduced into the atomizer by argon gas, and simultaneously measured on a two-channel atomic fluorescence spectrometer.
Determine the fluorescence intensity of arsenic and mercury atoms, and calculate the content of arsenic and mercury in fluorspar according to the standard curve method.
4 reagents and materials
Unless otherwise stated, only reagents identified as analytically pure and above are used. Water is secondary water or equivalent in accordance with GB/T 6682.
Degree of water.
4.1 Hydrogen peroxide. content ≥ 30%.
4.2 Nitric acid (ρ=1.42g/mL). excellent grade pure.
4.3 Hydrochloric acid (ρ=1.19g/mL). excellent grade pure.
4.4 Potassium borohydride.
4.5 Sodium hydroxide.
4.6 Thiourea.
4.7 Ascorbic acid.
4.8 Potassium dichromate.
4.9 Nitric acid (1 9). Mix 1 volume of nitric acid (4.2) with 9 volumes of water.
4.10 Hydrochloric acid (1 1). Mix 1 volume of hydrochloric acid (4.3) with 1 volume of water.
4.11 Potassium borohydride solution (20g/L). Weigh 10g potassium borohydride (4.4), 2.5g sodium hydroxide (4.5), dissolve in water and dilute to
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