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GB/T 8943.4-2008 English PDF

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GB/T 8943.4-2008: Paper, board and pulp -- Determination of calcium and magnesium
Status: Obsolete

GB/T 8943.4: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 8943.4-2008English399 Add to Cart 3 days [Need to translate] Paper, board and pulp -- Determination of calcium and magnesium Obsolete GB/T 8943.4-2008
GB/T 8943.4-1988English239 Add to Cart 2 days [Need to translate] Pulp and paper--Determination of calcium and magnesium Obsolete GB/T 8943.4-1988

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Basic data

Standard ID GB/T 8943.4-2008 (GB/T8943.4-2008)
Description (Translated English) Paper, board and pulp -- Determination of calcium and magnesium
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Y30
Classification of International Standard 85.060
Word Count Estimation 10,149
Date of Issue 2008-01-04
Date of Implementation 2008-09-01
Older Standard (superseded by this standard) GB/T 8943.4-1988
Quoted Standard GB/T 450; GB/T 462; GB/T 740; GB/T 741; GB/T 742
Adopted Standard ISO 777-2001, MOD
Regulation (derived from) National Standard Approval Announcement 2008 No.1 (Total No.114)
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 two methods. That EDTA complexometric titration (Method A) and flame atomic absorption spectrophotometry (Method B), the determination of paper, paperboard and pulp calcium, magnesium content, should arbitration by flame atomic absorption spectrophotometry (Method B). When the paper, paperboard and pulp calcium, magnesium content is greater than the respective 200mg/kg, can be used EDTA complexometric titration (Method A). This section applies to all kinds of paper, paperboard and pulp calcium, Determination of magnesium.

GB/T 8943.4-2008: Paper, board and pulp -- Determination of calcium and magnesium

---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.
Paper, boaed and pulp. Determination of calcium and magnesium ICS 85.060 Y30 National Standards of People's Republic of China Replacing GB/T 8943.4-1988 Paper, board and pulp, calcium and magnesium content (ISO 777.2001, MOD) Posted 2008-01-04 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 8943 is divided into four parts. --- GB/T 8943.1 "paper, board and pulp - Determination of copper content"; --- GB/T 8943.2 "paper, board and pulp - Determination of iron content"; --- GB/T 8943.3 "paper, board and pulp - Determination of manganese content"; --- GB/T 8943.4 "Paper, paperboard and pulp calcium and magnesium content determination." This part of GB /Part 4 T 8943, and 777 corresponding to the international standard ISO .2001 "Paper, board and pulp calcium content law". This part is GB/T 8943.4-1988 "Pulp, paper and paperboard, calcium, magnesium Determination Act" amendments. The partial modification of international standards ISO 777.2001. This part of International Standard ISO 777.2001 compared to the following changes. --- Adding a new test method (see Section 3 of this chapter). This part of ISO 777.2001 technical differences are listed in Appendix A. This part of ISO 777.2001 structure comparison are listed in Appendix B. This Part replaces GB/T 8943.4-1988. This portion of the GB/T 8943.4-1988 have compared the following changes. --- Increased warnings; --- Increasing the normative references; --- Modify some narrative statement. This section of the Appendices A and B are informative appendices. This part is proposed by the China National Light Industry Council. This part of the National Standardization Technical Committee under the jurisdiction of the paper industry. This part of the paper by the Zhejiang Provincial Quality Supervision, Inspection Station is responsible for drafting. The main drafters of this section. Pan Yong, Yu Deqing, dry Hayward. This part of the standard replaces the previous editions are. --- GB/T 8943.4-1961; GB/T 8943.4-1981; GB/T 8943.4-1988. This part of the National Standardization Technical Committee is responsible for interpreting the paper industry. Paper, board and pulp, calcium and magnesium content caveat! In the process of GB/T 8943, as defined in this section, the need for the use of certain hazardous chemicals, they can be formed with the air Into an explosive gas, so care must be taken to ensure compliance with the relevant safety precautions.

1 Scope

GB/T 8943 provisions of this part of the two methods, namely EDTA complexometric titration (Method A) and flame atomic absorption spectrophotometry (Method B), determination of paper, board and pulp calcium and magnesium content, should arbitration by flame atomic absorption spectrophotometry (Method B). When the paper, board and pulp calcium and magnesium content of greater than each 200mg/kg, you can use EDTA complexometric titration (Method A). This section applies to a variety of paper, board and pulp - Determination of calcium and magnesium content.

2 Normative references

The following documents contain provisions which, through GB/T reference in this 8943 constitute provisions of this part. For dated references Documents, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encourage the present section Research on the parties to reach an agreement to use the latest versions of these documents. For undated references, the latest version applies to This section. GB/T 450 to take a sample of paper and cardboard (GB/T 450-2002, eqv ISO 186.1994) GB/T 462 Paper and board Determination of moisture (GB/T 462-2003, ISO 287. 1985, MOD) GB/T 740 pulp samples taken (GB/T 740-2003, ISO 7213.1991, IDT) GB/T 741 Determination of pulp sample moisture (GB/T 741-2003, ISO 638. 1978, MOD) GB/T 742 paper, paperboard and pulp residue (ash) determination (900 ℃) (GB/T 742-2003, ISO 2144.1997, MOD) 3 Method A. EDTA complexometric titration 3.1 Principle The sample was ashed and the residue (ash) is dissolved in hydrochloric acid, and diluted to volume. Take one part of the solution was adjusted to pH = 12, calcium indicator, with EDTA standard solution titration, the standard solution of calcium consumption to calculate the content of the sample. Another part of the solution with ammonia buffer adjusted to pH = 10. In KB indicator (an acidic chrome blue K mixed indicator) with EDTA titration, EDTA solution volume consumed is the sum of calcium and magnesium consumption. By the total amount of calcium consumed to calculate the difference between the amount of EDTA magnesium content of the sample. 3.2 Reagents All reagents used for testing should be analytical grade (AR), test water should be distilled or deionized water. 3.2.1 EDTA standard solution. Ba (EDTA) = 1/56mol/L, dissolved 6.635g of EDTAC10H14O8N2Na2 · 2H2O) (GB 1401) in distilled water and diluted to 1L. 3.2.2 Zinc standard solution. Weigh 1g analytically pure metallic zinc particles (weighing accuracy 0.1mg) in 150mL conical flask, 6mol/L hydrochloric acid solution Liquid 10mL ~ 20mL completely dissolved and transferred to 1L volumetric flask, dilute to the mark with distilled water, according to the equation (1) calculate the standard zinc solution concentration. Ba = 65.38 m1 (1)

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