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GB/T 8577-2010 English PDF (GB/T 8577-2002, GB/T 8577-1988)

GB/T 8577-2010_English: PDF (GB/T8577-2010)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 8577-2010English90 Add to Cart 0--9 seconds. Auto-delivery Determination of free water for compound fertilizers -- Karl Fischer method Valid GB/T 8577-2010
GB/T 8577-2002English199 Add to Cart 2 days [Need to translate] Determination of free water for compound fertilizers -- Karl Fischer method Obsolete GB/T 8577-2002
GB/T 8577-1988English199 Add to Cart 2 days [Need to translate] Determination of free water for compound fertilizers--Karl fischer method Obsolete GB/T 8577-1988


BASIC DATA
Standard ID GB/T 8577-2010 (GB/T8577-2010)
Description (Translated English) Determination of free water for compound fertilizers. Karl Fischer method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G20
Classification of International Standard 65.080
Word Count Estimation 5,524
Date of Issue 2010-09-26
Date of Implementation 2011-03-01
Older Standard (superseded by this standard) GB/T 8577-2002
Quoted Standard GB/T 6283; GB/T 8571; HG/T 2843
Drafting Organization National Fertilizer Quality Supervision and Inspection Center (Shanghai)
Administrative Organization National Standardization Technical Committee fertilizers and soil conditioners
Regulation (derived from) National Standard Approval Announcement 2010 No.6 (Total No.161)
Proposing organization China Petroleum and Chemical Industry Association
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the Karl Fischer reagent titration methods. Determination of water content in compound fertilizer blending tour.

BASIC DATA
Standard ID GB/T 8577-2002 (GB/T8577-2002)
Description (Translated English) Determination of free water for compound fertilizers-Karl Fischer method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G20
Classification of International Standard 65.08
Word Count Estimation 5,534
Date of Issue 2002/9/24
Date of Implementation 2003/4/1
Older Standard (superseded by this standard) GB/T 8577-1988
Quoted Standard GB/T 2441.3; GB/T 6283; GB/T 8571; HG/T 2843
Regulation (derived from) Announcement of Newly Approved National Standards 2010 No. (No. 161 overall) 6
Proposing organization China Petroleum and Chemical Industry Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China

BASIC DATA
Standard ID GB/T 8577-1988 (GB/T8577-1988)
Description (Translated English) Determination of free water for compound fertilizers--Karl fischer method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G20
Word Count Estimation 2,236
Date of Issue 1988/1/4
Date of Implementation 1988/9/1


GB/T 8577-2010 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 65.080 G 20 Replacing GB/T 8577-2002 Determination of free water for compound fertilizers - Karl Fischer method ISSUED ON. SEPTEMBER 26, 2010 IMPLEMENTED ON. MARCH 1, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Principle ... 4 4 Reagents and materials ... 4 5 Instruments ... 5 6 Analysis steps ... 5 7 Expression of analysis results ... 6 Determination of free water for compound fertilizers - Karl Fischer method 1 Scope This Standard specifies the determination of free water content for compound fertilizers by the method of using dioxane to extract the free water from the fertilizer and then using the Karl Fischer reagent to titrate. 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB/T 6283 Chemical products - Determination of water - Karl Fischer method (general method) (GB/T 6283-2008, ISO 760.1978, NEQ) GB/T 8571 Preparation of laboratory samples for compound fertilizers HG/T 2843 Chemical fertilizer products - Standard volumetric standard reagent and indicator solutions for chemical analysis 3 Principle The free water in the sample is quantitatively reacted with the Karl Fischer reagent with the known titer of water. The reactions are as follows. H2O + I2 + SO2 + 3C5H5N = 2C5H5N · HI + C5H5N · SO3 C5H5N · SO3 + CH3OH = C5H5NH · OSO2OCH3 4 Reagents and materials The reagents, solutions and water used in this Standard shall comply with the specifications of HG/T 2843 when their specification and formulation are not specified. (except that it must be used for arbitration. Under normal cases, absolute ethanol or methanol can be used); SHAKE or oscillate for several minutes; STAND for 15 min, and then SHAKE or oscillate for several minutes. After the sample is slightly settled, TAKE part of the solution to centrifuge in the centrifuge tube with a brine bottle rubber stopper. DRAIN the residual solution in the titration vessel through the outlet; ADD 50 mL of methanol to the titration vessel; the amount of methanol shall be enough to submerge the electrode; TURN on the power; TURN on the electromagnetic stirrer; as the same with titration of Karl Fischer reagent; USE Karl Fischer reagent to titrate until the galvanometer has the same skew as the calibration; MAINTAIN stable for 1 min. TAKE 5.0 mL of dioxane extract from the centrifuge tube by syringe; INJECT into the titration vessel via the feed port; TITRATE to the end with Karl Fischer reagent; RECORD the volume (V1) of the consumed Karl Fischer reagent. When dioxane is used as the extractant, the residue solution in the titration vessel shall be drained after three titrations; ADD methanol; TITRATE to the end with Karl Fischer reagent, followed by the next determination. In the same manner, determine the volume (V2) of the Karl Fischer reagent consumed by 5.0 mL of dioxane. 7 Expression of analysis results 7.1 Calculation of analysis results Free water content w, expressed as mass fraction (%), is calculated according to formula (1). where. V1 - the value of the volume of the Karl Fischer reagent consumed by titrating 5.0 mL of dioxane extracts, in milliliters (mL); V2 - the value of the volume of the Karl Fischer reagent consumed by titrating 5.0 mL of dioxane, in milliliters (mL); T - the value of the titer of water of Karl Fischer reagent on, in milligrams per milliliter (mg/mL); m - the value of the sample mass, in grams (g). ......

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