GB/T 22804-2008 English PDF

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GB/T 22804-2008: Pulp, paper and board -- Determination of mercury content
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22804-2008	209	Add to Cart	3 days	Pulp, paper and board -- Determination of mercury content	Valid

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Basic data

Standard ID: GB/T 22804-2008 (GB/T22804-2008)
Description (Translated English): Pulp, paper and board -- Determination of mercury content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y30
Classification of International Standard: 85-010
Word Count Estimation: 9,914
Date of Issue: 2008-12-30
Date of Implementation: 2009-09-01
Quoted Standard: GB/T 450; GB/T 462; GB/T 740; GB/T 6682
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 pulp, paper and cardboard in the determination of mercury content. This standard applies to a variety of available nitric acid digestion of wet paper, paperboard and pulp determination of mercury content. The method detection limit: 0. 02mg/kg.

GB/T 22804-2008: Pulp, paper and board -- Determination of mercury content

---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.
Pulp, paper and board. Determination of mercury content ICS 85-010 Y30 National Standards of People's Republic of China Determination of pulp, paper and paperboard mercury content Posted 2008-12-30 2009-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The Standard Appendix A, Appendix B is an informative annex. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee of the paper industry. This standard was drafted. People's Republic of China SZCIQ, China Pulp and Paper Research Institute. The main drafters of this standard. Xu Rong, Chen Xuhui, Guhao Fei, Zhang Yaling. Determination of pulp, paper and paperboard mercury content

1 Scope

This standard specifies the method for determination of pulp, paper and paperboard mercury content. This standard applies to the determination of paper, paperboard and pulp in the mercury content of the various available wet nitric acid digestion. The detection limit. 0.02mg/kg.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 450 and take samples to an aspect of paper and paperboard samples, positive and negative determination (GB/T 450-2008, ISO 186. 2002, MOD) GB/T 462 paper, board and pulp - Determination of water sample (GB/T 462-2008; ISO 287. 1985, MOD; ISO 638. 1978, MOD) GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213. 1981, IDT) GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD) Principle 3 The sample was placed in a closed container, adding a certain amount of nitric acid at high temperature and pressure conditions, digestion. Digestion solution appropriately diluted After the restore process by reducing state mercury compounds into atomic states of mercury, the carrier gas into the quartz tube furnace, a wavelength in the low-pressure mercury lamp 253.7nm excitation beam excitation, produce atomic fluorescence, and fluorescence intensity is proportional to the mercury content of the sample, and compare the standard curve into Line quantitative analysis.

4 Reagents

Unless otherwise indicated, used in the analysis confirmed only for the gifted class pure reagents. 4.1 Water, GB/T 6682, Grade 2. 4.2 nitric acid (HNO3), ρ = 1.40g/mL, the mass fraction is 65% to 68%. 4.3 nitric acid (HNO3), 5 + 95, the 50mL of nitric acid (4.2) was added to a volume of 950mL water. 4.4 solution of potassium borohydride (KBH4), 0.05%, weighed 0.5g of potassium hydroxide (KOH) in 100mL of water, after dissolved, 0.05g Potassium borohydride dissolved therein, if precipitation, filtration required after use. 4.5 mercury standard stock solution, 100mg/L, weighed 0.162g mercuric nitrate (HgNO3) in the beaker, add nitric acid (4.3) was dissolved with nitric Acid (4.3) and dilute to 1L. Solution was kept in a sealed polyethylene container. 4.6 mercury standard solution, 0.2mg/L, with a pipette Pipette 1mL mercury standard stock solution (4.5) in 10mL volumetric flask, with nitrate Acid (4.3) diluted to the mark, with a pipette from 10mL volumetric flask Pipette 1mL mercury standard solution in 50mL volumetric flask with Nitric acid (4.3) diluted to the mark. This solution should be days of preparation. 5. Apparatus 5.1 oven, temperature range of room temperature ~ 200 ℃, temperature control accuracy of ± 2 ℃. 5.2 pressure digestion tank with 100mL Teflon inner tank. ......

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